Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2014 Red Hat |
| 3 | * |
| 4 | * Permission to use, copy, modify, distribute, and sell this software and its |
| 5 | * documentation for any purpose is hereby granted without fee, provided that |
| 6 | * the above copyright notice appear in all copies and that both that copyright |
| 7 | * notice and this permission notice appear in supporting documentation, and |
| 8 | * that the name of the copyright holders not be used in advertising or |
| 9 | * publicity pertaining to distribution of the software without specific, |
| 10 | * written prior permission. The copyright holders make no representations |
| 11 | * about the suitability of this software for any purpose. It is provided "as |
| 12 | * is" without express or implied warranty. |
| 13 | * |
| 14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| 15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| 16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| 17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| 18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| 20 | * OF THIS SOFTWARE. |
| 21 | */ |
| 22 | |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 23 | #include <linux/bitfield.h> |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 24 | #include <linux/delay.h> |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 25 | #include <linux/errno.h> |
Jani Nikula | 580fc13 | 2019-05-06 12:52:47 +0300 | [diff] [blame] | 26 | #include <linux/i2c.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/kernel.h> |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 29 | #include <linux/random.h> |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 30 | #include <linux/sched.h> |
Dave Airlie | 75bc08a | 2014-07-09 11:15:09 +1000 | [diff] [blame] | 31 | #include <linux/seq_file.h> |
Lyude Paul | 873a95e | 2020-04-03 15:47:15 -0400 | [diff] [blame] | 32 | #include <linux/iopoll.h> |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 33 | |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 34 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) |
Chenwandun | 68acde76 | 2019-10-31 17:43:49 +0800 | [diff] [blame] | 35 | #include <linux/stacktrace.h> |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 36 | #include <linux/sort.h> |
| 37 | #include <linux/timekeeping.h> |
| 38 | #include <linux/math64.h> |
| 39 | #endif |
| 40 | |
Thomas Zimmermann | da68386 | 2022-04-21 09:31:02 +0200 | [diff] [blame] | 41 | #include <drm/display/drm_dp_mst_helper.h> |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 42 | #include <drm/drm_atomic.h> |
| 43 | #include <drm/drm_atomic_helper.h> |
Jani Nikula | 580fc13 | 2019-05-06 12:52:47 +0300 | [diff] [blame] | 44 | #include <drm/drm_drv.h> |
Ville Syrjälä | 255490f9 | 2022-06-14 12:02:45 +0300 | [diff] [blame] | 45 | #include <drm/drm_edid.h> |
Imre Deak | 191dc43 | 2023-11-16 15:18:31 +0200 | [diff] [blame] | 46 | #include <drm/drm_fixed.h> |
Jani Nikula | 580fc13 | 2019-05-06 12:52:47 +0300 | [diff] [blame] | 47 | #include <drm/drm_print.h> |
Daniel Vetter | fcd70cd | 2019-01-17 22:03:34 +0100 | [diff] [blame] | 48 | #include <drm/drm_probe_helper.h> |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 49 | |
Thomas Zimmermann | 3681eb2 | 2022-01-14 12:45:32 +0100 | [diff] [blame] | 50 | #include "drm_dp_helper_internal.h" |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 51 | #include "drm_dp_mst_topology_internal.h" |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 52 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 53 | /** |
| 54 | * DOC: dp mst helper |
| 55 | * |
| 56 | * These functions contain parts of the DisplayPort 1.2a MultiStream Transport |
| 57 | * protocol. The helpers contain a topology manager and bandwidth manager. |
| 58 | * The helpers encapsulate the sending and received of sideband msgs. |
| 59 | */ |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 60 | struct drm_dp_pending_up_req { |
| 61 | struct drm_dp_sideband_msg_hdr hdr; |
| 62 | struct drm_dp_sideband_msg_req_body msg; |
| 63 | struct list_head next; |
| 64 | }; |
| 65 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 66 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
| 67 | char *buf); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 68 | |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 69 | static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 70 | |
| 71 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 72 | int id, u8 start_slot, u8 num_slots); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 73 | |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 74 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
| 75 | struct drm_dp_mst_port *port, |
| 76 | int offset, int size, u8 *bytes); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 77 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
| 78 | struct drm_dp_mst_port *port, |
| 79 | int offset, int size, u8 *bytes); |
| 80 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 81 | static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
| 82 | struct drm_dp_mst_branch *mstb); |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 83 | |
| 84 | static void |
| 85 | drm_dp_send_clear_payload_id_table(struct drm_dp_mst_topology_mgr *mgr, |
| 86 | struct drm_dp_mst_branch *mstb); |
| 87 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 88 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
| 89 | struct drm_dp_mst_branch *mstb, |
| 90 | struct drm_dp_mst_port *port); |
| 91 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
| 92 | u8 *guid); |
| 93 | |
Imre Deak | d8bd15b | 2020-06-08 00:25:21 +0300 | [diff] [blame] | 94 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_mst_port *port); |
| 95 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_mst_port *port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 96 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); |
Ville Syrjälä | 3dadbd2 | 2019-01-22 22:03:01 +0200 | [diff] [blame] | 97 | |
Wayne Lin | 3769e4c | 2021-06-16 11:55:01 +0800 | [diff] [blame] | 98 | static bool drm_dp_mst_port_downstream_of_branch(struct drm_dp_mst_port *port, |
| 99 | struct drm_dp_mst_branch *branch); |
| 100 | |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 101 | #define DBG_PREFIX "[dp_mst]" |
| 102 | |
Ville Syrjälä | 3dadbd2 | 2019-01-22 22:03:01 +0200 | [diff] [blame] | 103 | #define DP_STR(x) [DP_ ## x] = #x |
| 104 | |
| 105 | static const char *drm_dp_mst_req_type_str(u8 req_type) |
| 106 | { |
| 107 | static const char * const req_type_str[] = { |
| 108 | DP_STR(GET_MSG_TRANSACTION_VERSION), |
| 109 | DP_STR(LINK_ADDRESS), |
| 110 | DP_STR(CONNECTION_STATUS_NOTIFY), |
| 111 | DP_STR(ENUM_PATH_RESOURCES), |
| 112 | DP_STR(ALLOCATE_PAYLOAD), |
| 113 | DP_STR(QUERY_PAYLOAD), |
| 114 | DP_STR(RESOURCE_STATUS_NOTIFY), |
| 115 | DP_STR(CLEAR_PAYLOAD_ID_TABLE), |
| 116 | DP_STR(REMOTE_DPCD_READ), |
| 117 | DP_STR(REMOTE_DPCD_WRITE), |
| 118 | DP_STR(REMOTE_I2C_READ), |
| 119 | DP_STR(REMOTE_I2C_WRITE), |
| 120 | DP_STR(POWER_UP_PHY), |
| 121 | DP_STR(POWER_DOWN_PHY), |
| 122 | DP_STR(SINK_EVENT_NOTIFY), |
| 123 | DP_STR(QUERY_STREAM_ENC_STATUS), |
| 124 | }; |
| 125 | |
| 126 | if (req_type >= ARRAY_SIZE(req_type_str) || |
| 127 | !req_type_str[req_type]) |
| 128 | return "unknown"; |
| 129 | |
| 130 | return req_type_str[req_type]; |
| 131 | } |
| 132 | |
| 133 | #undef DP_STR |
| 134 | #define DP_STR(x) [DP_NAK_ ## x] = #x |
| 135 | |
| 136 | static const char *drm_dp_mst_nak_reason_str(u8 nak_reason) |
| 137 | { |
| 138 | static const char * const nak_reason_str[] = { |
| 139 | DP_STR(WRITE_FAILURE), |
| 140 | DP_STR(INVALID_READ), |
| 141 | DP_STR(CRC_FAILURE), |
| 142 | DP_STR(BAD_PARAM), |
| 143 | DP_STR(DEFER), |
| 144 | DP_STR(LINK_FAILURE), |
| 145 | DP_STR(NO_RESOURCES), |
| 146 | DP_STR(DPCD_FAIL), |
| 147 | DP_STR(I2C_NAK), |
| 148 | DP_STR(ALLOCATE_FAIL), |
| 149 | }; |
| 150 | |
| 151 | if (nak_reason >= ARRAY_SIZE(nak_reason_str) || |
| 152 | !nak_reason_str[nak_reason]) |
| 153 | return "unknown"; |
| 154 | |
| 155 | return nak_reason_str[nak_reason]; |
| 156 | } |
| 157 | |
| 158 | #undef DP_STR |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 159 | #define DP_STR(x) [DRM_DP_SIDEBAND_TX_ ## x] = #x |
| 160 | |
| 161 | static const char *drm_dp_mst_sideband_tx_state_str(int state) |
| 162 | { |
| 163 | static const char * const sideband_reason_str[] = { |
| 164 | DP_STR(QUEUED), |
| 165 | DP_STR(START_SEND), |
| 166 | DP_STR(SENT), |
| 167 | DP_STR(RX), |
| 168 | DP_STR(TIMEOUT), |
| 169 | }; |
| 170 | |
| 171 | if (state >= ARRAY_SIZE(sideband_reason_str) || |
| 172 | !sideband_reason_str[state]) |
| 173 | return "unknown"; |
| 174 | |
| 175 | return sideband_reason_str[state]; |
| 176 | } |
| 177 | |
| 178 | static int |
| 179 | drm_dp_mst_rad_to_str(const u8 rad[8], u8 lct, char *out, size_t len) |
| 180 | { |
| 181 | int i; |
| 182 | u8 unpacked_rad[16]; |
| 183 | |
| 184 | for (i = 0; i < lct; i++) { |
| 185 | if (i % 2) |
| 186 | unpacked_rad[i] = rad[i / 2] >> 4; |
| 187 | else |
| 188 | unpacked_rad[i] = rad[i / 2] & BIT_MASK(4); |
| 189 | } |
| 190 | |
| 191 | /* TODO: Eventually add something to printk so we can format the rad |
| 192 | * like this: 1.2.3 |
| 193 | */ |
| 194 | return snprintf(out, len, "%*phC", lct, unpacked_rad); |
| 195 | } |
Ville Syrjälä | 3dadbd2 | 2019-01-22 22:03:01 +0200 | [diff] [blame] | 196 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 197 | /* sideband msg handling */ |
| 198 | static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) |
| 199 | { |
| 200 | u8 bitmask = 0x80; |
| 201 | u8 bitshift = 7; |
| 202 | u8 array_index = 0; |
| 203 | int number_of_bits = num_nibbles * 4; |
| 204 | u8 remainder = 0; |
| 205 | |
| 206 | while (number_of_bits != 0) { |
| 207 | number_of_bits--; |
| 208 | remainder <<= 1; |
| 209 | remainder |= (data[array_index] & bitmask) >> bitshift; |
| 210 | bitmask >>= 1; |
| 211 | bitshift--; |
| 212 | if (bitmask == 0) { |
| 213 | bitmask = 0x80; |
| 214 | bitshift = 7; |
| 215 | array_index++; |
| 216 | } |
| 217 | if ((remainder & 0x10) == 0x10) |
| 218 | remainder ^= 0x13; |
| 219 | } |
| 220 | |
| 221 | number_of_bits = 4; |
| 222 | while (number_of_bits != 0) { |
| 223 | number_of_bits--; |
| 224 | remainder <<= 1; |
| 225 | if ((remainder & 0x10) != 0) |
| 226 | remainder ^= 0x13; |
| 227 | } |
| 228 | |
| 229 | return remainder; |
| 230 | } |
| 231 | |
| 232 | static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) |
| 233 | { |
| 234 | u8 bitmask = 0x80; |
| 235 | u8 bitshift = 7; |
| 236 | u8 array_index = 0; |
| 237 | int number_of_bits = number_of_bytes * 8; |
| 238 | u16 remainder = 0; |
| 239 | |
| 240 | while (number_of_bits != 0) { |
| 241 | number_of_bits--; |
| 242 | remainder <<= 1; |
| 243 | remainder |= (data[array_index] & bitmask) >> bitshift; |
| 244 | bitmask >>= 1; |
| 245 | bitshift--; |
| 246 | if (bitmask == 0) { |
| 247 | bitmask = 0x80; |
| 248 | bitshift = 7; |
| 249 | array_index++; |
| 250 | } |
| 251 | if ((remainder & 0x100) == 0x100) |
| 252 | remainder ^= 0xd5; |
| 253 | } |
| 254 | |
| 255 | number_of_bits = 8; |
| 256 | while (number_of_bits != 0) { |
| 257 | number_of_bits--; |
| 258 | remainder <<= 1; |
| 259 | if ((remainder & 0x100) != 0) |
| 260 | remainder ^= 0xd5; |
| 261 | } |
| 262 | |
| 263 | return remainder & 0xff; |
| 264 | } |
| 265 | static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) |
| 266 | { |
| 267 | u8 size = 3; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 268 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 269 | size += (hdr->lct / 2); |
| 270 | return size; |
| 271 | } |
| 272 | |
| 273 | static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
| 274 | u8 *buf, int *len) |
| 275 | { |
| 276 | int idx = 0; |
| 277 | int i; |
| 278 | u8 crc4; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 279 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 280 | buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); |
| 281 | for (i = 0; i < (hdr->lct / 2); i++) |
| 282 | buf[idx++] = hdr->rad[i]; |
| 283 | buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | |
| 284 | (hdr->msg_len & 0x3f); |
| 285 | buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); |
| 286 | |
| 287 | crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); |
| 288 | buf[idx - 1] |= (crc4 & 0xf); |
| 289 | |
| 290 | *len = idx; |
| 291 | } |
| 292 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 293 | static bool drm_dp_decode_sideband_msg_hdr(const struct drm_dp_mst_topology_mgr *mgr, |
| 294 | struct drm_dp_sideband_msg_hdr *hdr, |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 295 | u8 *buf, int buflen, u8 *hdrlen) |
| 296 | { |
| 297 | u8 crc4; |
| 298 | u8 len; |
| 299 | int i; |
| 300 | u8 idx; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 301 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 302 | if (buf[0] == 0) |
| 303 | return false; |
| 304 | len = 3; |
| 305 | len += ((buf[0] & 0xf0) >> 4) / 2; |
| 306 | if (len > buflen) |
| 307 | return false; |
| 308 | crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); |
| 309 | |
| 310 | if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 311 | drm_dbg_kms(mgr->dev, "crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 312 | return false; |
| 313 | } |
| 314 | |
| 315 | hdr->lct = (buf[0] & 0xf0) >> 4; |
| 316 | hdr->lcr = (buf[0] & 0xf); |
| 317 | idx = 1; |
| 318 | for (i = 0; i < (hdr->lct / 2); i++) |
| 319 | hdr->rad[i] = buf[idx++]; |
| 320 | hdr->broadcast = (buf[idx] >> 7) & 0x1; |
| 321 | hdr->path_msg = (buf[idx] >> 6) & 0x1; |
| 322 | hdr->msg_len = buf[idx] & 0x3f; |
| 323 | idx++; |
| 324 | hdr->somt = (buf[idx] >> 7) & 0x1; |
| 325 | hdr->eomt = (buf[idx] >> 6) & 0x1; |
| 326 | hdr->seqno = (buf[idx] >> 4) & 0x1; |
| 327 | idx++; |
| 328 | *hdrlen = idx; |
| 329 | return true; |
| 330 | } |
| 331 | |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 332 | void |
| 333 | drm_dp_encode_sideband_req(const struct drm_dp_sideband_msg_req_body *req, |
| 334 | struct drm_dp_sideband_msg_tx *raw) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 335 | { |
| 336 | int idx = 0; |
| 337 | int i; |
| 338 | u8 *buf = raw->msg; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 339 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 340 | buf[idx++] = req->req_type & 0x7f; |
| 341 | |
| 342 | switch (req->req_type) { |
| 343 | case DP_ENUM_PATH_RESOURCES: |
Lyude Paul | aa2a2fe | 2019-09-03 17:57:02 -0400 | [diff] [blame] | 344 | case DP_POWER_DOWN_PHY: |
| 345 | case DP_POWER_UP_PHY: |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 346 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; |
| 347 | idx++; |
| 348 | break; |
| 349 | case DP_ALLOCATE_PAYLOAD: |
| 350 | buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | |
| 351 | (req->u.allocate_payload.number_sdp_streams & 0xf); |
| 352 | idx++; |
| 353 | buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); |
| 354 | idx++; |
| 355 | buf[idx] = (req->u.allocate_payload.pbn >> 8); |
| 356 | idx++; |
| 357 | buf[idx] = (req->u.allocate_payload.pbn & 0xff); |
| 358 | idx++; |
| 359 | for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { |
| 360 | buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | |
| 361 | (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); |
| 362 | idx++; |
| 363 | } |
| 364 | if (req->u.allocate_payload.number_sdp_streams & 1) { |
| 365 | i = req->u.allocate_payload.number_sdp_streams - 1; |
| 366 | buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; |
| 367 | idx++; |
| 368 | } |
| 369 | break; |
| 370 | case DP_QUERY_PAYLOAD: |
| 371 | buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; |
| 372 | idx++; |
| 373 | buf[idx] = (req->u.query_payload.vcpi & 0x7f); |
| 374 | idx++; |
| 375 | break; |
| 376 | case DP_REMOTE_DPCD_READ: |
| 377 | buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; |
| 378 | buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; |
| 379 | idx++; |
| 380 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; |
| 381 | idx++; |
| 382 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); |
| 383 | idx++; |
| 384 | buf[idx] = (req->u.dpcd_read.num_bytes); |
| 385 | idx++; |
| 386 | break; |
| 387 | |
| 388 | case DP_REMOTE_DPCD_WRITE: |
| 389 | buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; |
| 390 | buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; |
| 391 | idx++; |
| 392 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; |
| 393 | idx++; |
| 394 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); |
| 395 | idx++; |
| 396 | buf[idx] = (req->u.dpcd_write.num_bytes); |
| 397 | idx++; |
| 398 | memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); |
| 399 | idx += req->u.dpcd_write.num_bytes; |
| 400 | break; |
| 401 | case DP_REMOTE_I2C_READ: |
| 402 | buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; |
| 403 | buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); |
| 404 | idx++; |
| 405 | for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { |
| 406 | buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; |
| 407 | idx++; |
| 408 | buf[idx] = req->u.i2c_read.transactions[i].num_bytes; |
| 409 | idx++; |
| 410 | memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); |
| 411 | idx += req->u.i2c_read.transactions[i].num_bytes; |
| 412 | |
Wayne Lin | c4e4fcc | 2020-01-03 13:50:01 +0800 | [diff] [blame] | 413 | buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 4; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 414 | buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); |
| 415 | idx++; |
| 416 | } |
| 417 | buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; |
| 418 | idx++; |
| 419 | buf[idx] = (req->u.i2c_read.num_bytes_read); |
| 420 | idx++; |
| 421 | break; |
| 422 | |
| 423 | case DP_REMOTE_I2C_WRITE: |
| 424 | buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; |
| 425 | idx++; |
| 426 | buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; |
| 427 | idx++; |
| 428 | buf[idx] = (req->u.i2c_write.num_bytes); |
| 429 | idx++; |
| 430 | memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); |
| 431 | idx += req->u.i2c_write.num_bytes; |
| 432 | break; |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 433 | case DP_QUERY_STREAM_ENC_STATUS: { |
| 434 | const struct drm_dp_query_stream_enc_status *msg; |
| 435 | |
| 436 | msg = &req->u.enc_status; |
| 437 | buf[idx] = msg->stream_id; |
| 438 | idx++; |
| 439 | memcpy(&buf[idx], msg->client_id, sizeof(msg->client_id)); |
| 440 | idx += sizeof(msg->client_id); |
| 441 | buf[idx] = 0; |
| 442 | buf[idx] |= FIELD_PREP(GENMASK(1, 0), msg->stream_event); |
| 443 | buf[idx] |= msg->valid_stream_event ? BIT(2) : 0; |
| 444 | buf[idx] |= FIELD_PREP(GENMASK(4, 3), msg->stream_behavior); |
| 445 | buf[idx] |= msg->valid_stream_behavior ? BIT(5) : 0; |
| 446 | idx++; |
| 447 | } |
| 448 | break; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 449 | } |
| 450 | raw->cur_len = idx; |
| 451 | } |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 452 | EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_encode_sideband_req); |
| 453 | |
| 454 | /* Decode a sideband request we've encoded, mainly used for debugging */ |
| 455 | int |
| 456 | drm_dp_decode_sideband_req(const struct drm_dp_sideband_msg_tx *raw, |
| 457 | struct drm_dp_sideband_msg_req_body *req) |
| 458 | { |
| 459 | const u8 *buf = raw->msg; |
| 460 | int i, idx = 0; |
| 461 | |
| 462 | req->req_type = buf[idx++] & 0x7f; |
| 463 | switch (req->req_type) { |
| 464 | case DP_ENUM_PATH_RESOURCES: |
| 465 | case DP_POWER_DOWN_PHY: |
| 466 | case DP_POWER_UP_PHY: |
| 467 | req->u.port_num.port_number = (buf[idx] >> 4) & 0xf; |
| 468 | break; |
| 469 | case DP_ALLOCATE_PAYLOAD: |
| 470 | { |
| 471 | struct drm_dp_allocate_payload *a = |
| 472 | &req->u.allocate_payload; |
| 473 | |
| 474 | a->number_sdp_streams = buf[idx] & 0xf; |
| 475 | a->port_number = (buf[idx] >> 4) & 0xf; |
| 476 | |
| 477 | WARN_ON(buf[++idx] & 0x80); |
| 478 | a->vcpi = buf[idx] & 0x7f; |
| 479 | |
| 480 | a->pbn = buf[++idx] << 8; |
| 481 | a->pbn |= buf[++idx]; |
| 482 | |
| 483 | idx++; |
| 484 | for (i = 0; i < a->number_sdp_streams; i++) { |
| 485 | a->sdp_stream_sink[i] = |
| 486 | (buf[idx + (i / 2)] >> ((i % 2) ? 0 : 4)) & 0xf; |
| 487 | } |
| 488 | } |
| 489 | break; |
| 490 | case DP_QUERY_PAYLOAD: |
| 491 | req->u.query_payload.port_number = (buf[idx] >> 4) & 0xf; |
| 492 | WARN_ON(buf[++idx] & 0x80); |
| 493 | req->u.query_payload.vcpi = buf[idx] & 0x7f; |
| 494 | break; |
| 495 | case DP_REMOTE_DPCD_READ: |
| 496 | { |
| 497 | struct drm_dp_remote_dpcd_read *r = &req->u.dpcd_read; |
| 498 | |
| 499 | r->port_number = (buf[idx] >> 4) & 0xf; |
| 500 | |
| 501 | r->dpcd_address = (buf[idx] << 16) & 0xf0000; |
| 502 | r->dpcd_address |= (buf[++idx] << 8) & 0xff00; |
| 503 | r->dpcd_address |= buf[++idx] & 0xff; |
| 504 | |
| 505 | r->num_bytes = buf[++idx]; |
| 506 | } |
| 507 | break; |
| 508 | case DP_REMOTE_DPCD_WRITE: |
| 509 | { |
| 510 | struct drm_dp_remote_dpcd_write *w = |
| 511 | &req->u.dpcd_write; |
| 512 | |
| 513 | w->port_number = (buf[idx] >> 4) & 0xf; |
| 514 | |
| 515 | w->dpcd_address = (buf[idx] << 16) & 0xf0000; |
| 516 | w->dpcd_address |= (buf[++idx] << 8) & 0xff00; |
| 517 | w->dpcd_address |= buf[++idx] & 0xff; |
| 518 | |
| 519 | w->num_bytes = buf[++idx]; |
| 520 | |
| 521 | w->bytes = kmemdup(&buf[++idx], w->num_bytes, |
| 522 | GFP_KERNEL); |
| 523 | if (!w->bytes) |
| 524 | return -ENOMEM; |
| 525 | } |
| 526 | break; |
| 527 | case DP_REMOTE_I2C_READ: |
| 528 | { |
| 529 | struct drm_dp_remote_i2c_read *r = &req->u.i2c_read; |
| 530 | struct drm_dp_remote_i2c_read_tx *tx; |
| 531 | bool failed = false; |
| 532 | |
| 533 | r->num_transactions = buf[idx] & 0x3; |
| 534 | r->port_number = (buf[idx] >> 4) & 0xf; |
| 535 | for (i = 0; i < r->num_transactions; i++) { |
| 536 | tx = &r->transactions[i]; |
| 537 | |
| 538 | tx->i2c_dev_id = buf[++idx] & 0x7f; |
| 539 | tx->num_bytes = buf[++idx]; |
| 540 | tx->bytes = kmemdup(&buf[++idx], |
| 541 | tx->num_bytes, |
| 542 | GFP_KERNEL); |
| 543 | if (!tx->bytes) { |
| 544 | failed = true; |
| 545 | break; |
| 546 | } |
| 547 | idx += tx->num_bytes; |
| 548 | tx->no_stop_bit = (buf[idx] >> 5) & 0x1; |
| 549 | tx->i2c_transaction_delay = buf[idx] & 0xf; |
| 550 | } |
| 551 | |
| 552 | if (failed) { |
Colin Ian King | 2c8bc91 | 2019-11-20 17:35:09 +0000 | [diff] [blame] | 553 | for (i = 0; i < r->num_transactions; i++) { |
| 554 | tx = &r->transactions[i]; |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 555 | kfree(tx->bytes); |
Colin Ian King | 2c8bc91 | 2019-11-20 17:35:09 +0000 | [diff] [blame] | 556 | } |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 557 | return -ENOMEM; |
| 558 | } |
| 559 | |
| 560 | r->read_i2c_device_id = buf[++idx] & 0x7f; |
| 561 | r->num_bytes_read = buf[++idx]; |
| 562 | } |
| 563 | break; |
| 564 | case DP_REMOTE_I2C_WRITE: |
| 565 | { |
| 566 | struct drm_dp_remote_i2c_write *w = &req->u.i2c_write; |
| 567 | |
| 568 | w->port_number = (buf[idx] >> 4) & 0xf; |
| 569 | w->write_i2c_device_id = buf[++idx] & 0x7f; |
| 570 | w->num_bytes = buf[++idx]; |
| 571 | w->bytes = kmemdup(&buf[++idx], w->num_bytes, |
| 572 | GFP_KERNEL); |
| 573 | if (!w->bytes) |
| 574 | return -ENOMEM; |
| 575 | } |
| 576 | break; |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 577 | case DP_QUERY_STREAM_ENC_STATUS: |
| 578 | req->u.enc_status.stream_id = buf[idx++]; |
| 579 | for (i = 0; i < sizeof(req->u.enc_status.client_id); i++) |
| 580 | req->u.enc_status.client_id[i] = buf[idx++]; |
| 581 | |
| 582 | req->u.enc_status.stream_event = FIELD_GET(GENMASK(1, 0), |
| 583 | buf[idx]); |
| 584 | req->u.enc_status.valid_stream_event = FIELD_GET(BIT(2), |
| 585 | buf[idx]); |
| 586 | req->u.enc_status.stream_behavior = FIELD_GET(GENMASK(4, 3), |
| 587 | buf[idx]); |
| 588 | req->u.enc_status.valid_stream_behavior = FIELD_GET(BIT(5), |
| 589 | buf[idx]); |
| 590 | break; |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 591 | } |
| 592 | |
| 593 | return 0; |
| 594 | } |
| 595 | EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_decode_sideband_req); |
| 596 | |
| 597 | void |
| 598 | drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req, |
| 599 | int indent, struct drm_printer *printer) |
| 600 | { |
| 601 | int i; |
| 602 | |
| 603 | #define P(f, ...) drm_printf_indent(printer, indent, f, ##__VA_ARGS__) |
| 604 | if (req->req_type == DP_LINK_ADDRESS) { |
| 605 | /* No contents to print */ |
| 606 | P("type=%s\n", drm_dp_mst_req_type_str(req->req_type)); |
| 607 | return; |
| 608 | } |
| 609 | |
| 610 | P("type=%s contents:\n", drm_dp_mst_req_type_str(req->req_type)); |
| 611 | indent++; |
| 612 | |
| 613 | switch (req->req_type) { |
| 614 | case DP_ENUM_PATH_RESOURCES: |
| 615 | case DP_POWER_DOWN_PHY: |
| 616 | case DP_POWER_UP_PHY: |
| 617 | P("port=%d\n", req->u.port_num.port_number); |
| 618 | break; |
| 619 | case DP_ALLOCATE_PAYLOAD: |
| 620 | P("port=%d vcpi=%d pbn=%d sdp_streams=%d %*ph\n", |
| 621 | req->u.allocate_payload.port_number, |
| 622 | req->u.allocate_payload.vcpi, req->u.allocate_payload.pbn, |
| 623 | req->u.allocate_payload.number_sdp_streams, |
| 624 | req->u.allocate_payload.number_sdp_streams, |
| 625 | req->u.allocate_payload.sdp_stream_sink); |
| 626 | break; |
| 627 | case DP_QUERY_PAYLOAD: |
| 628 | P("port=%d vcpi=%d\n", |
| 629 | req->u.query_payload.port_number, |
| 630 | req->u.query_payload.vcpi); |
| 631 | break; |
| 632 | case DP_REMOTE_DPCD_READ: |
| 633 | P("port=%d dpcd_addr=%05x len=%d\n", |
| 634 | req->u.dpcd_read.port_number, req->u.dpcd_read.dpcd_address, |
| 635 | req->u.dpcd_read.num_bytes); |
| 636 | break; |
| 637 | case DP_REMOTE_DPCD_WRITE: |
| 638 | P("port=%d addr=%05x len=%d: %*ph\n", |
| 639 | req->u.dpcd_write.port_number, |
| 640 | req->u.dpcd_write.dpcd_address, |
| 641 | req->u.dpcd_write.num_bytes, req->u.dpcd_write.num_bytes, |
| 642 | req->u.dpcd_write.bytes); |
| 643 | break; |
| 644 | case DP_REMOTE_I2C_READ: |
| 645 | P("port=%d num_tx=%d id=%d size=%d:\n", |
| 646 | req->u.i2c_read.port_number, |
| 647 | req->u.i2c_read.num_transactions, |
| 648 | req->u.i2c_read.read_i2c_device_id, |
| 649 | req->u.i2c_read.num_bytes_read); |
| 650 | |
| 651 | indent++; |
| 652 | for (i = 0; i < req->u.i2c_read.num_transactions; i++) { |
| 653 | const struct drm_dp_remote_i2c_read_tx *rtx = |
| 654 | &req->u.i2c_read.transactions[i]; |
| 655 | |
| 656 | P("%d: id=%03d size=%03d no_stop_bit=%d tx_delay=%03d: %*ph\n", |
| 657 | i, rtx->i2c_dev_id, rtx->num_bytes, |
| 658 | rtx->no_stop_bit, rtx->i2c_transaction_delay, |
| 659 | rtx->num_bytes, rtx->bytes); |
| 660 | } |
| 661 | break; |
| 662 | case DP_REMOTE_I2C_WRITE: |
| 663 | P("port=%d id=%d size=%d: %*ph\n", |
| 664 | req->u.i2c_write.port_number, |
| 665 | req->u.i2c_write.write_i2c_device_id, |
| 666 | req->u.i2c_write.num_bytes, req->u.i2c_write.num_bytes, |
| 667 | req->u.i2c_write.bytes); |
| 668 | break; |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 669 | case DP_QUERY_STREAM_ENC_STATUS: |
| 670 | P("stream_id=%u client_id=%*ph stream_event=%x " |
| 671 | "valid_event=%d stream_behavior=%x valid_behavior=%d", |
| 672 | req->u.enc_status.stream_id, |
| 673 | (int)ARRAY_SIZE(req->u.enc_status.client_id), |
| 674 | req->u.enc_status.client_id, req->u.enc_status.stream_event, |
| 675 | req->u.enc_status.valid_stream_event, |
| 676 | req->u.enc_status.stream_behavior, |
| 677 | req->u.enc_status.valid_stream_behavior); |
| 678 | break; |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 679 | default: |
| 680 | P("???\n"); |
| 681 | break; |
| 682 | } |
| 683 | #undef P |
| 684 | } |
| 685 | EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_dump_sideband_msg_req_body); |
| 686 | |
| 687 | static inline void |
| 688 | drm_dp_mst_dump_sideband_msg_tx(struct drm_printer *p, |
| 689 | const struct drm_dp_sideband_msg_tx *txmsg) |
| 690 | { |
| 691 | struct drm_dp_sideband_msg_req_body req; |
| 692 | char buf[64]; |
| 693 | int ret; |
| 694 | int i; |
| 695 | |
| 696 | drm_dp_mst_rad_to_str(txmsg->dst->rad, txmsg->dst->lct, buf, |
| 697 | sizeof(buf)); |
| 698 | drm_printf(p, "txmsg cur_offset=%x cur_len=%x seqno=%x state=%s path_msg=%d dst=%s\n", |
| 699 | txmsg->cur_offset, txmsg->cur_len, txmsg->seqno, |
| 700 | drm_dp_mst_sideband_tx_state_str(txmsg->state), |
| 701 | txmsg->path_msg, buf); |
| 702 | |
| 703 | ret = drm_dp_decode_sideband_req(txmsg, &req); |
| 704 | if (ret) { |
| 705 | drm_printf(p, "<failed to decode sideband req: %d>\n", ret); |
| 706 | return; |
| 707 | } |
| 708 | drm_dp_dump_sideband_msg_req_body(&req, 1, p); |
| 709 | |
| 710 | switch (req.req_type) { |
| 711 | case DP_REMOTE_DPCD_WRITE: |
| 712 | kfree(req.u.dpcd_write.bytes); |
| 713 | break; |
| 714 | case DP_REMOTE_I2C_READ: |
| 715 | for (i = 0; i < req.u.i2c_read.num_transactions; i++) |
| 716 | kfree(req.u.i2c_read.transactions[i].bytes); |
| 717 | break; |
| 718 | case DP_REMOTE_I2C_WRITE: |
| 719 | kfree(req.u.i2c_write.bytes); |
| 720 | break; |
| 721 | } |
| 722 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 723 | |
| 724 | static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) |
| 725 | { |
| 726 | u8 crc4; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 727 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 728 | crc4 = drm_dp_msg_data_crc4(msg, len); |
| 729 | msg[len] = crc4; |
| 730 | } |
| 731 | |
| 732 | static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, |
| 733 | struct drm_dp_sideband_msg_tx *raw) |
| 734 | { |
| 735 | int idx = 0; |
| 736 | u8 *buf = raw->msg; |
| 737 | |
| 738 | buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); |
| 739 | |
| 740 | raw->cur_len = idx; |
| 741 | } |
| 742 | |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 743 | static int drm_dp_sideband_msg_set_header(struct drm_dp_sideband_msg_rx *msg, |
| 744 | struct drm_dp_sideband_msg_hdr *hdr, |
| 745 | u8 hdrlen) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 746 | { |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 747 | /* |
| 748 | * ignore out-of-order messages or messages that are part of a |
| 749 | * failed transaction |
| 750 | */ |
| 751 | if (!hdr->somt && !msg->have_somt) |
| 752 | return false; |
| 753 | |
| 754 | /* get length contained in this portion */ |
| 755 | msg->curchunk_idx = 0; |
| 756 | msg->curchunk_len = hdr->msg_len; |
| 757 | msg->curchunk_hdrlen = hdrlen; |
| 758 | |
| 759 | /* we have already gotten an somt - don't bother parsing */ |
| 760 | if (hdr->somt && msg->have_somt) |
| 761 | return false; |
| 762 | |
| 763 | if (hdr->somt) { |
| 764 | memcpy(&msg->initial_hdr, hdr, |
| 765 | sizeof(struct drm_dp_sideband_msg_hdr)); |
| 766 | msg->have_somt = true; |
| 767 | } |
| 768 | if (hdr->eomt) |
| 769 | msg->have_eomt = true; |
| 770 | |
| 771 | return true; |
| 772 | } |
| 773 | |
| 774 | /* this adds a chunk of msg to the builder to get the final msg */ |
| 775 | static bool drm_dp_sideband_append_payload(struct drm_dp_sideband_msg_rx *msg, |
| 776 | u8 *replybuf, u8 replybuflen) |
| 777 | { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 778 | u8 crc4; |
| 779 | |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 780 | memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); |
| 781 | msg->curchunk_idx += replybuflen; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 782 | |
| 783 | if (msg->curchunk_idx >= msg->curchunk_len) { |
| 784 | /* do CRC */ |
| 785 | crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); |
Benjamin Gaignard | d6b8bbc | 2020-02-03 13:16:20 +0100 | [diff] [blame] | 786 | if (crc4 != msg->chunk[msg->curchunk_len - 1]) |
| 787 | print_hex_dump(KERN_DEBUG, "wrong crc", |
| 788 | DUMP_PREFIX_NONE, 16, 1, |
| 789 | msg->chunk, msg->curchunk_len, false); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 790 | /* copy chunk into bigger msg */ |
| 791 | memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); |
| 792 | msg->curlen += msg->curchunk_len - 1; |
| 793 | } |
| 794 | return true; |
| 795 | } |
| 796 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 797 | static bool drm_dp_sideband_parse_link_address(const struct drm_dp_mst_topology_mgr *mgr, |
| 798 | struct drm_dp_sideband_msg_rx *raw, |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 799 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 800 | { |
| 801 | int idx = 1; |
| 802 | int i; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 803 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 804 | memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); |
| 805 | idx += 16; |
| 806 | repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; |
| 807 | idx++; |
| 808 | if (idx > raw->curlen) |
| 809 | goto fail_len; |
| 810 | for (i = 0; i < repmsg->u.link_addr.nports; i++) { |
| 811 | if (raw->msg[idx] & 0x80) |
| 812 | repmsg->u.link_addr.ports[i].input_port = 1; |
| 813 | |
| 814 | repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; |
| 815 | repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); |
| 816 | |
| 817 | idx++; |
| 818 | if (idx > raw->curlen) |
| 819 | goto fail_len; |
| 820 | repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; |
| 821 | repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; |
| 822 | if (repmsg->u.link_addr.ports[i].input_port == 0) |
| 823 | repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
| 824 | idx++; |
| 825 | if (idx > raw->curlen) |
| 826 | goto fail_len; |
| 827 | if (repmsg->u.link_addr.ports[i].input_port == 0) { |
| 828 | repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); |
| 829 | idx++; |
| 830 | if (idx > raw->curlen) |
| 831 | goto fail_len; |
| 832 | memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); |
| 833 | idx += 16; |
| 834 | if (idx > raw->curlen) |
| 835 | goto fail_len; |
| 836 | repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; |
| 837 | repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); |
| 838 | idx++; |
| 839 | |
| 840 | } |
| 841 | if (idx > raw->curlen) |
| 842 | goto fail_len; |
| 843 | } |
| 844 | |
| 845 | return true; |
| 846 | fail_len: |
| 847 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); |
| 848 | return false; |
| 849 | } |
| 850 | |
| 851 | static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, |
| 852 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 853 | { |
| 854 | int idx = 1; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 855 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 856 | repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; |
| 857 | idx++; |
| 858 | if (idx > raw->curlen) |
| 859 | goto fail_len; |
| 860 | repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; |
Hans Verkuil | a4c30a4 | 2018-08-27 10:07:42 +0200 | [diff] [blame] | 861 | idx++; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 862 | if (idx > raw->curlen) |
| 863 | goto fail_len; |
| 864 | |
| 865 | memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); |
| 866 | return true; |
| 867 | fail_len: |
| 868 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); |
| 869 | return false; |
| 870 | } |
| 871 | |
| 872 | static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, |
| 873 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 874 | { |
| 875 | int idx = 1; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 876 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 877 | repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; |
| 878 | idx++; |
| 879 | if (idx > raw->curlen) |
| 880 | goto fail_len; |
| 881 | return true; |
| 882 | fail_len: |
| 883 | DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); |
| 884 | return false; |
| 885 | } |
| 886 | |
| 887 | static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, |
| 888 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 889 | { |
| 890 | int idx = 1; |
| 891 | |
| 892 | repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); |
| 893 | idx++; |
| 894 | if (idx > raw->curlen) |
| 895 | goto fail_len; |
| 896 | repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; |
| 897 | idx++; |
| 898 | /* TODO check */ |
| 899 | memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); |
| 900 | return true; |
| 901 | fail_len: |
| 902 | DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); |
| 903 | return false; |
| 904 | } |
| 905 | |
| 906 | static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, |
| 907 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 908 | { |
| 909 | int idx = 1; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 910 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 911 | repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; |
David Francis | a3c2b0f | 2019-06-06 11:20:10 -0400 | [diff] [blame] | 912 | repmsg->u.path_resources.fec_capable = raw->msg[idx] & 0x1; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 913 | idx++; |
| 914 | if (idx > raw->curlen) |
| 915 | goto fail_len; |
| 916 | repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| 917 | idx += 2; |
| 918 | if (idx > raw->curlen) |
| 919 | goto fail_len; |
| 920 | repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| 921 | idx += 2; |
| 922 | if (idx > raw->curlen) |
| 923 | goto fail_len; |
| 924 | return true; |
| 925 | fail_len: |
| 926 | DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); |
| 927 | return false; |
| 928 | } |
| 929 | |
| 930 | static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
| 931 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 932 | { |
| 933 | int idx = 1; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 934 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 935 | repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
| 936 | idx++; |
| 937 | if (idx > raw->curlen) |
| 938 | goto fail_len; |
| 939 | repmsg->u.allocate_payload.vcpi = raw->msg[idx]; |
| 940 | idx++; |
| 941 | if (idx > raw->curlen) |
| 942 | goto fail_len; |
| 943 | repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| 944 | idx += 2; |
| 945 | if (idx > raw->curlen) |
| 946 | goto fail_len; |
| 947 | return true; |
| 948 | fail_len: |
| 949 | DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); |
| 950 | return false; |
| 951 | } |
| 952 | |
| 953 | static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
| 954 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 955 | { |
| 956 | int idx = 1; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 957 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 958 | repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
| 959 | idx++; |
| 960 | if (idx > raw->curlen) |
| 961 | goto fail_len; |
| 962 | repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
| 963 | idx += 2; |
| 964 | if (idx > raw->curlen) |
| 965 | goto fail_len; |
| 966 | return true; |
| 967 | fail_len: |
| 968 | DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); |
| 969 | return false; |
| 970 | } |
| 971 | |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 972 | static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_msg_rx *raw, |
| 973 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 974 | { |
| 975 | int idx = 1; |
| 976 | |
| 977 | repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf; |
| 978 | idx++; |
| 979 | if (idx > raw->curlen) { |
| 980 | DRM_DEBUG_KMS("power up/down phy parse length fail %d %d\n", |
| 981 | idx, raw->curlen); |
| 982 | return false; |
| 983 | } |
| 984 | return true; |
| 985 | } |
| 986 | |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 987 | static bool |
| 988 | drm_dp_sideband_parse_query_stream_enc_status( |
| 989 | struct drm_dp_sideband_msg_rx *raw, |
| 990 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 991 | { |
| 992 | struct drm_dp_query_stream_enc_status_ack_reply *reply; |
| 993 | |
| 994 | reply = &repmsg->u.enc_status; |
| 995 | |
| 996 | reply->stream_id = raw->msg[3]; |
| 997 | |
| 998 | reply->reply_signed = raw->msg[2] & BIT(0); |
| 999 | |
| 1000 | /* |
| 1001 | * NOTE: It's my impression from reading the spec that the below parsing |
| 1002 | * is correct. However I noticed while testing with an HDCP 1.4 display |
| 1003 | * through an HDCP 2.2 hub that only bit 3 was set. In that case, I |
| 1004 | * would expect both bits to be set. So keep the parsing following the |
| 1005 | * spec, but beware reality might not match the spec (at least for some |
| 1006 | * configurations). |
| 1007 | */ |
| 1008 | reply->hdcp_1x_device_present = raw->msg[2] & BIT(4); |
| 1009 | reply->hdcp_2x_device_present = raw->msg[2] & BIT(3); |
| 1010 | |
| 1011 | reply->query_capable_device_present = raw->msg[2] & BIT(5); |
| 1012 | reply->legacy_device_present = raw->msg[2] & BIT(6); |
| 1013 | reply->unauthorizable_device_present = raw->msg[2] & BIT(7); |
| 1014 | |
| 1015 | reply->auth_completed = !!(raw->msg[1] & BIT(3)); |
| 1016 | reply->encryption_enabled = !!(raw->msg[1] & BIT(4)); |
| 1017 | reply->repeater_present = !!(raw->msg[1] & BIT(5)); |
| 1018 | reply->state = (raw->msg[1] & GENMASK(7, 6)) >> 6; |
| 1019 | |
| 1020 | return true; |
| 1021 | } |
| 1022 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1023 | static bool drm_dp_sideband_parse_reply(const struct drm_dp_mst_topology_mgr *mgr, |
| 1024 | struct drm_dp_sideband_msg_rx *raw, |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1025 | struct drm_dp_sideband_msg_reply_body *msg) |
| 1026 | { |
| 1027 | memset(msg, 0, sizeof(*msg)); |
| 1028 | msg->reply_type = (raw->msg[0] & 0x80) >> 7; |
| 1029 | msg->req_type = (raw->msg[0] & 0x7f); |
| 1030 | |
Ville Syrjälä | 45bbda1 | 2019-01-22 22:03:00 +0200 | [diff] [blame] | 1031 | if (msg->reply_type == DP_SIDEBAND_REPLY_NAK) { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1032 | memcpy(msg->u.nak.guid, &raw->msg[1], 16); |
| 1033 | msg->u.nak.reason = raw->msg[17]; |
| 1034 | msg->u.nak.nak_data = raw->msg[18]; |
| 1035 | return false; |
| 1036 | } |
| 1037 | |
| 1038 | switch (msg->req_type) { |
| 1039 | case DP_LINK_ADDRESS: |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1040 | return drm_dp_sideband_parse_link_address(mgr, raw, msg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1041 | case DP_QUERY_PAYLOAD: |
| 1042 | return drm_dp_sideband_parse_query_payload_ack(raw, msg); |
| 1043 | case DP_REMOTE_DPCD_READ: |
| 1044 | return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); |
| 1045 | case DP_REMOTE_DPCD_WRITE: |
| 1046 | return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); |
| 1047 | case DP_REMOTE_I2C_READ: |
| 1048 | return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); |
Sam McNally | adb48b2 | 2020-07-27 16:03:37 +1000 | [diff] [blame] | 1049 | case DP_REMOTE_I2C_WRITE: |
| 1050 | return true; /* since there's nothing to parse */ |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1051 | case DP_ENUM_PATH_RESOURCES: |
| 1052 | return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); |
| 1053 | case DP_ALLOCATE_PAYLOAD: |
| 1054 | return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 1055 | case DP_POWER_DOWN_PHY: |
| 1056 | case DP_POWER_UP_PHY: |
| 1057 | return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg); |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 1058 | case DP_CLEAR_PAYLOAD_ID_TABLE: |
| 1059 | return true; /* since there's nothing to parse */ |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 1060 | case DP_QUERY_STREAM_ENC_STATUS: |
| 1061 | return drm_dp_sideband_parse_query_stream_enc_status(raw, msg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1062 | default: |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1063 | drm_err(mgr->dev, "Got unknown reply 0x%02x (%s)\n", |
| 1064 | msg->req_type, drm_dp_mst_req_type_str(msg->req_type)); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1065 | return false; |
| 1066 | } |
| 1067 | } |
| 1068 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1069 | static bool |
| 1070 | drm_dp_sideband_parse_connection_status_notify(const struct drm_dp_mst_topology_mgr *mgr, |
| 1071 | struct drm_dp_sideband_msg_rx *raw, |
| 1072 | struct drm_dp_sideband_msg_req_body *msg) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1073 | { |
| 1074 | int idx = 1; |
| 1075 | |
| 1076 | msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
| 1077 | idx++; |
| 1078 | if (idx > raw->curlen) |
| 1079 | goto fail_len; |
| 1080 | |
| 1081 | memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); |
| 1082 | idx += 16; |
| 1083 | if (idx > raw->curlen) |
| 1084 | goto fail_len; |
| 1085 | |
| 1086 | msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; |
| 1087 | msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
| 1088 | msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; |
| 1089 | msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; |
| 1090 | msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); |
| 1091 | idx++; |
| 1092 | return true; |
| 1093 | fail_len: |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1094 | drm_dbg_kms(mgr->dev, "connection status reply parse length fail %d %d\n", |
| 1095 | idx, raw->curlen); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1096 | return false; |
| 1097 | } |
| 1098 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1099 | static bool drm_dp_sideband_parse_resource_status_notify(const struct drm_dp_mst_topology_mgr *mgr, |
| 1100 | struct drm_dp_sideband_msg_rx *raw, |
| 1101 | struct drm_dp_sideband_msg_req_body *msg) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1102 | { |
| 1103 | int idx = 1; |
| 1104 | |
| 1105 | msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
| 1106 | idx++; |
| 1107 | if (idx > raw->curlen) |
| 1108 | goto fail_len; |
| 1109 | |
| 1110 | memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); |
| 1111 | idx += 16; |
| 1112 | if (idx > raw->curlen) |
| 1113 | goto fail_len; |
| 1114 | |
| 1115 | msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
| 1116 | idx++; |
| 1117 | return true; |
| 1118 | fail_len: |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1119 | drm_dbg_kms(mgr->dev, "resource status reply parse length fail %d %d\n", idx, raw->curlen); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1120 | return false; |
| 1121 | } |
| 1122 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1123 | static bool drm_dp_sideband_parse_req(const struct drm_dp_mst_topology_mgr *mgr, |
| 1124 | struct drm_dp_sideband_msg_rx *raw, |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1125 | struct drm_dp_sideband_msg_req_body *msg) |
| 1126 | { |
| 1127 | memset(msg, 0, sizeof(*msg)); |
| 1128 | msg->req_type = (raw->msg[0] & 0x7f); |
| 1129 | |
| 1130 | switch (msg->req_type) { |
| 1131 | case DP_CONNECTION_STATUS_NOTIFY: |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1132 | return drm_dp_sideband_parse_connection_status_notify(mgr, raw, msg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1133 | case DP_RESOURCE_STATUS_NOTIFY: |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1134 | return drm_dp_sideband_parse_resource_status_notify(mgr, raw, msg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1135 | default: |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1136 | drm_err(mgr->dev, "Got unknown request 0x%02x (%s)\n", |
| 1137 | msg->req_type, drm_dp_mst_req_type_str(msg->req_type)); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1138 | return false; |
| 1139 | } |
| 1140 | } |
| 1141 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 1142 | static void build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, |
| 1143 | u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1144 | { |
| 1145 | struct drm_dp_sideband_msg_req_body req; |
| 1146 | |
| 1147 | req.req_type = DP_REMOTE_DPCD_WRITE; |
| 1148 | req.u.dpcd_write.port_number = port_num; |
| 1149 | req.u.dpcd_write.dpcd_address = offset; |
| 1150 | req.u.dpcd_write.num_bytes = num_bytes; |
| 1151 | req.u.dpcd_write.bytes = bytes; |
| 1152 | drm_dp_encode_sideband_req(&req, msg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1153 | } |
| 1154 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 1155 | static void build_link_address(struct drm_dp_sideband_msg_tx *msg) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1156 | { |
| 1157 | struct drm_dp_sideband_msg_req_body req; |
| 1158 | |
| 1159 | req.req_type = DP_LINK_ADDRESS; |
| 1160 | drm_dp_encode_sideband_req(&req, msg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1161 | } |
| 1162 | |
Maya Rashish | bdf7e3b | 2020-03-21 22:29:59 +0000 | [diff] [blame] | 1163 | static void build_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg) |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 1164 | { |
| 1165 | struct drm_dp_sideband_msg_req_body req; |
| 1166 | |
| 1167 | req.req_type = DP_CLEAR_PAYLOAD_ID_TABLE; |
| 1168 | drm_dp_encode_sideband_req(&req, msg); |
Wayne Lin | d919d3d | 2021-02-24 18:15:21 +0800 | [diff] [blame] | 1169 | msg->path_msg = true; |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 1170 | } |
| 1171 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 1172 | static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, |
| 1173 | int port_num) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1174 | { |
| 1175 | struct drm_dp_sideband_msg_req_body req; |
| 1176 | |
| 1177 | req.req_type = DP_ENUM_PATH_RESOURCES; |
| 1178 | req.u.port_num.port_number = port_num; |
| 1179 | drm_dp_encode_sideband_req(&req, msg); |
| 1180 | msg->path_msg = true; |
| 1181 | return 0; |
| 1182 | } |
| 1183 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 1184 | static void build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, |
| 1185 | int port_num, |
| 1186 | u8 vcpi, uint16_t pbn, |
| 1187 | u8 number_sdp_streams, |
| 1188 | u8 *sdp_stream_sink) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1189 | { |
| 1190 | struct drm_dp_sideband_msg_req_body req; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 1191 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1192 | memset(&req, 0, sizeof(req)); |
| 1193 | req.req_type = DP_ALLOCATE_PAYLOAD; |
| 1194 | req.u.allocate_payload.port_number = port_num; |
| 1195 | req.u.allocate_payload.vcpi = vcpi; |
| 1196 | req.u.allocate_payload.pbn = pbn; |
Libin Yang | ef8f9be | 2015-12-02 14:09:43 +0800 | [diff] [blame] | 1197 | req.u.allocate_payload.number_sdp_streams = number_sdp_streams; |
| 1198 | memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink, |
| 1199 | number_sdp_streams); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1200 | drm_dp_encode_sideband_req(&req, msg); |
| 1201 | msg->path_msg = true; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1202 | } |
| 1203 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 1204 | static void build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, |
| 1205 | int port_num, bool power_up) |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 1206 | { |
| 1207 | struct drm_dp_sideband_msg_req_body req; |
| 1208 | |
| 1209 | if (power_up) |
| 1210 | req.req_type = DP_POWER_UP_PHY; |
| 1211 | else |
| 1212 | req.req_type = DP_POWER_DOWN_PHY; |
| 1213 | |
| 1214 | req.u.port_num.port_number = port_num; |
| 1215 | drm_dp_encode_sideband_req(&req, msg); |
| 1216 | msg->path_msg = true; |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 1217 | } |
| 1218 | |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 1219 | static int |
| 1220 | build_query_stream_enc_status(struct drm_dp_sideband_msg_tx *msg, u8 stream_id, |
| 1221 | u8 *q_id) |
| 1222 | { |
| 1223 | struct drm_dp_sideband_msg_req_body req; |
| 1224 | |
| 1225 | req.req_type = DP_QUERY_STREAM_ENC_STATUS; |
| 1226 | req.u.enc_status.stream_id = stream_id; |
| 1227 | memcpy(req.u.enc_status.client_id, q_id, |
| 1228 | sizeof(req.u.enc_status.client_id)); |
| 1229 | req.u.enc_status.stream_event = 0; |
| 1230 | req.u.enc_status.valid_stream_event = false; |
| 1231 | req.u.enc_status.stream_behavior = 0; |
| 1232 | req.u.enc_status.valid_stream_behavior = false; |
| 1233 | |
| 1234 | drm_dp_encode_sideband_req(&req, msg); |
| 1235 | return 0; |
| 1236 | } |
| 1237 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1238 | static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, |
| 1239 | struct drm_dp_sideband_msg_tx *txmsg) |
| 1240 | { |
Chris Wilson | 992d38c | 2017-05-13 11:52:00 +0100 | [diff] [blame] | 1241 | unsigned int state; |
Daniel Vetter | cd961bb | 2015-01-28 10:02:23 +0100 | [diff] [blame] | 1242 | |
| 1243 | /* |
| 1244 | * All updates to txmsg->state are protected by mgr->qlock, and the two |
| 1245 | * cases we check here are terminal states. For those the barriers |
| 1246 | * provided by the wake_up/wait_event pair are enough. |
| 1247 | */ |
Chris Wilson | 992d38c | 2017-05-13 11:52:00 +0100 | [diff] [blame] | 1248 | state = READ_ONCE(txmsg->state); |
| 1249 | return (state == DRM_DP_SIDEBAND_TX_RX || |
| 1250 | state == DRM_DP_SIDEBAND_TX_TIMEOUT); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1251 | } |
| 1252 | |
| 1253 | static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, |
| 1254 | struct drm_dp_sideband_msg_tx *txmsg) |
| 1255 | { |
| 1256 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
Imre Deak | 471bdd0 | 2020-06-04 21:45:00 +0300 | [diff] [blame] | 1257 | unsigned long wait_timeout = msecs_to_jiffies(4000); |
| 1258 | unsigned long wait_expires = jiffies + wait_timeout; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1259 | int ret; |
| 1260 | |
Imre Deak | 471bdd0 | 2020-06-04 21:45:00 +0300 | [diff] [blame] | 1261 | for (;;) { |
| 1262 | /* |
| 1263 | * If the driver provides a way for this, change to |
| 1264 | * poll-waiting for the MST reply interrupt if we didn't receive |
| 1265 | * it for 50 msec. This would cater for cases where the HPD |
| 1266 | * pulse signal got lost somewhere, even though the sink raised |
| 1267 | * the corresponding MST interrupt correctly. One example is the |
| 1268 | * Club 3D CAC-1557 TypeC -> DP adapter which for some reason |
| 1269 | * filters out short pulses with a duration less than ~540 usec. |
| 1270 | * |
| 1271 | * The poll period is 50 msec to avoid missing an interrupt |
| 1272 | * after the sink has cleared it (after a 110msec timeout |
| 1273 | * since it raised the interrupt). |
| 1274 | */ |
| 1275 | ret = wait_event_timeout(mgr->tx_waitq, |
| 1276 | check_txmsg_state(mgr, txmsg), |
| 1277 | mgr->cbs->poll_hpd_irq ? |
| 1278 | msecs_to_jiffies(50) : |
| 1279 | wait_timeout); |
| 1280 | |
| 1281 | if (ret || !mgr->cbs->poll_hpd_irq || |
| 1282 | time_after(jiffies, wait_expires)) |
| 1283 | break; |
| 1284 | |
| 1285 | mgr->cbs->poll_hpd_irq(mgr); |
| 1286 | } |
| 1287 | |
Imre Deak | 8b9f343 | 2020-06-04 00:10:39 +0300 | [diff] [blame] | 1288 | mutex_lock(&mgr->qlock); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1289 | if (ret > 0) { |
| 1290 | if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { |
| 1291 | ret = -EIO; |
| 1292 | goto out; |
| 1293 | } |
| 1294 | } else { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1295 | drm_dbg_kms(mgr->dev, "timedout msg send %p %d %d\n", |
| 1296 | txmsg, txmsg->state, txmsg->seqno); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1297 | |
| 1298 | /* dump some state */ |
| 1299 | ret = -EIO; |
| 1300 | |
| 1301 | /* remove from q */ |
| 1302 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || |
Imre Deak | 58c1721 | 2020-05-13 13:31:55 +0300 | [diff] [blame] | 1303 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || |
| 1304 | txmsg->state == DRM_DP_SIDEBAND_TX_SENT) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1305 | list_del(&txmsg->next); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1306 | } |
| 1307 | out: |
Jani Nikula | f0a8f53 | 2019-10-01 17:06:14 +0300 | [diff] [blame] | 1308 | if (unlikely(ret == -EIO) && drm_debug_enabled(DRM_UT_DP)) { |
Jani Nikula | 6470aac | 2024-01-16 15:07:29 +0200 | [diff] [blame] | 1309 | struct drm_printer p = drm_dbg_printer(mgr->dev, DRM_UT_DP, |
| 1310 | DBG_PREFIX); |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 1311 | |
| 1312 | drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); |
| 1313 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1314 | mutex_unlock(&mgr->qlock); |
| 1315 | |
Wayne Lin | 5a64967 | 2020-01-13 17:36:49 +0800 | [diff] [blame] | 1316 | drm_dp_mst_kick_tx(mgr); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1317 | return ret; |
| 1318 | } |
| 1319 | |
| 1320 | static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) |
| 1321 | { |
| 1322 | struct drm_dp_mst_branch *mstb; |
| 1323 | |
| 1324 | mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); |
| 1325 | if (!mstb) |
| 1326 | return NULL; |
| 1327 | |
| 1328 | mstb->lct = lct; |
| 1329 | if (lct > 1) |
| 1330 | memcpy(mstb->rad, rad, lct / 2); |
| 1331 | INIT_LIST_HEAD(&mstb->ports); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1332 | kref_init(&mstb->topology_kref); |
| 1333 | kref_init(&mstb->malloc_kref); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1334 | return mstb; |
| 1335 | } |
| 1336 | |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 1337 | static void drm_dp_free_mst_branch_device(struct kref *kref) |
| 1338 | { |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1339 | struct drm_dp_mst_branch *mstb = |
| 1340 | container_of(kref, struct drm_dp_mst_branch, malloc_kref); |
| 1341 | |
| 1342 | if (mstb->port_parent) |
| 1343 | drm_dp_mst_put_port_malloc(mstb->port_parent); |
| 1344 | |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 1345 | kfree(mstb); |
| 1346 | } |
| 1347 | |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1348 | /** |
| 1349 | * DOC: Branch device and port refcounting |
| 1350 | * |
| 1351 | * Topology refcount overview |
| 1352 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 1353 | * |
| 1354 | * The refcounting schemes for &struct drm_dp_mst_branch and &struct |
| 1355 | * drm_dp_mst_port are somewhat unusual. Both ports and branch devices have |
| 1356 | * two different kinds of refcounts: topology refcounts, and malloc refcounts. |
| 1357 | * |
| 1358 | * Topology refcounts are not exposed to drivers, and are handled internally |
| 1359 | * by the DP MST helpers. The helpers use them in order to prevent the |
| 1360 | * in-memory topology state from being changed in the middle of critical |
| 1361 | * operations like changing the internal state of payload allocations. This |
| 1362 | * means each branch and port will be considered to be connected to the rest |
Matt Roper | 1e55a53 | 2019-02-01 17:23:26 -0800 | [diff] [blame] | 1363 | * of the topology until its topology refcount reaches zero. Additionally, |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1364 | * for ports this means that their associated &struct drm_connector will stay |
| 1365 | * registered with userspace until the port's refcount reaches 0. |
| 1366 | * |
| 1367 | * Malloc refcount overview |
| 1368 | * ~~~~~~~~~~~~~~~~~~~~~~~~ |
| 1369 | * |
| 1370 | * Malloc references are used to keep a &struct drm_dp_mst_port or &struct |
| 1371 | * drm_dp_mst_branch allocated even after all of its topology references have |
| 1372 | * been dropped, so that the driver or MST helpers can safely access each |
| 1373 | * branch's last known state before it was disconnected from the topology. |
| 1374 | * When the malloc refcount of a port or branch reaches 0, the memory |
| 1375 | * allocation containing the &struct drm_dp_mst_branch or &struct |
| 1376 | * drm_dp_mst_port respectively will be freed. |
| 1377 | * |
| 1378 | * For &struct drm_dp_mst_branch, malloc refcounts are not currently exposed |
| 1379 | * to drivers. As of writing this documentation, there are no drivers that |
| 1380 | * have a usecase for accessing &struct drm_dp_mst_branch outside of the MST |
| 1381 | * helpers. Exposing this API to drivers in a race-free manner would take more |
| 1382 | * tweaking of the refcounting scheme, however patches are welcome provided |
| 1383 | * there is a legitimate driver usecase for this. |
| 1384 | * |
| 1385 | * Refcount relationships in a topology |
| 1386 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 1387 | * |
| 1388 | * Let's take a look at why the relationship between topology and malloc |
| 1389 | * refcounts is designed the way it is. |
| 1390 | * |
| 1391 | * .. kernel-figure:: dp-mst/topology-figure-1.dot |
| 1392 | * |
| 1393 | * An example of topology and malloc refs in a DP MST topology with two |
| 1394 | * active payloads. Topology refcount increments are indicated by solid |
| 1395 | * lines, and malloc refcount increments are indicated by dashed lines. |
| 1396 | * Each starts from the branch which incremented the refcount, and ends at |
| 1397 | * the branch to which the refcount belongs to, i.e. the arrow points the |
| 1398 | * same way as the C pointers used to reference a structure. |
| 1399 | * |
| 1400 | * As you can see in the above figure, every branch increments the topology |
Matt Roper | 1e55a53 | 2019-02-01 17:23:26 -0800 | [diff] [blame] | 1401 | * refcount of its children, and increments the malloc refcount of its |
| 1402 | * parent. Additionally, every payload increments the malloc refcount of its |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1403 | * assigned port by 1. |
| 1404 | * |
| 1405 | * So, what would happen if MSTB #3 from the above figure was unplugged from |
| 1406 | * the system, but the driver hadn't yet removed payload #2 from port #3? The |
| 1407 | * topology would start to look like the figure below. |
| 1408 | * |
| 1409 | * .. kernel-figure:: dp-mst/topology-figure-2.dot |
| 1410 | * |
| 1411 | * Ports and branch devices which have been released from memory are |
| 1412 | * colored grey, and references which have been removed are colored red. |
| 1413 | * |
| 1414 | * Whenever a port or branch device's topology refcount reaches zero, it will |
| 1415 | * decrement the topology refcounts of all its children, the malloc refcount |
| 1416 | * of its parent, and finally its own malloc refcount. For MSTB #4 and port |
| 1417 | * #4, this means they both have been disconnected from the topology and freed |
| 1418 | * from memory. But, because payload #2 is still holding a reference to port |
Matt Roper | 1e55a53 | 2019-02-01 17:23:26 -0800 | [diff] [blame] | 1419 | * #3, port #3 is removed from the topology but its &struct drm_dp_mst_port |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1420 | * is still accessible from memory. This also means port #3 has not yet |
Matt Roper | 1e55a53 | 2019-02-01 17:23:26 -0800 | [diff] [blame] | 1421 | * decremented the malloc refcount of MSTB #3, so its &struct |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1422 | * drm_dp_mst_branch will also stay allocated in memory until port #3's |
| 1423 | * malloc refcount reaches 0. |
| 1424 | * |
| 1425 | * This relationship is necessary because in order to release payload #2, we |
| 1426 | * need to be able to figure out the last relative of port #3 that's still |
| 1427 | * connected to the topology. In this case, we would travel up the topology as |
| 1428 | * shown below. |
| 1429 | * |
| 1430 | * .. kernel-figure:: dp-mst/topology-figure-3.dot |
| 1431 | * |
| 1432 | * And finally, remove payload #2 by communicating with port #2 through |
| 1433 | * sideband transactions. |
| 1434 | */ |
| 1435 | |
| 1436 | /** |
| 1437 | * drm_dp_mst_get_mstb_malloc() - Increment the malloc refcount of a branch |
| 1438 | * device |
| 1439 | * @mstb: The &struct drm_dp_mst_branch to increment the malloc refcount of |
| 1440 | * |
| 1441 | * Increments &drm_dp_mst_branch.malloc_kref. When |
| 1442 | * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb |
| 1443 | * will be released and @mstb may no longer be used. |
| 1444 | * |
| 1445 | * See also: drm_dp_mst_put_mstb_malloc() |
| 1446 | */ |
| 1447 | static void |
| 1448 | drm_dp_mst_get_mstb_malloc(struct drm_dp_mst_branch *mstb) |
| 1449 | { |
| 1450 | kref_get(&mstb->malloc_kref); |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1451 | drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref)); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1452 | } |
| 1453 | |
| 1454 | /** |
| 1455 | * drm_dp_mst_put_mstb_malloc() - Decrement the malloc refcount of a branch |
| 1456 | * device |
| 1457 | * @mstb: The &struct drm_dp_mst_branch to decrement the malloc refcount of |
| 1458 | * |
| 1459 | * Decrements &drm_dp_mst_branch.malloc_kref. When |
| 1460 | * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb |
| 1461 | * will be released and @mstb may no longer be used. |
| 1462 | * |
| 1463 | * See also: drm_dp_mst_get_mstb_malloc() |
| 1464 | */ |
| 1465 | static void |
| 1466 | drm_dp_mst_put_mstb_malloc(struct drm_dp_mst_branch *mstb) |
| 1467 | { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1468 | drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref) - 1); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1469 | kref_put(&mstb->malloc_kref, drm_dp_free_mst_branch_device); |
| 1470 | } |
| 1471 | |
| 1472 | static void drm_dp_free_mst_port(struct kref *kref) |
| 1473 | { |
| 1474 | struct drm_dp_mst_port *port = |
| 1475 | container_of(kref, struct drm_dp_mst_port, malloc_kref); |
| 1476 | |
| 1477 | drm_dp_mst_put_mstb_malloc(port->parent); |
| 1478 | kfree(port); |
| 1479 | } |
| 1480 | |
| 1481 | /** |
| 1482 | * drm_dp_mst_get_port_malloc() - Increment the malloc refcount of an MST port |
| 1483 | * @port: The &struct drm_dp_mst_port to increment the malloc refcount of |
| 1484 | * |
| 1485 | * Increments &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref |
| 1486 | * reaches 0, the memory allocation for @port will be released and @port may |
| 1487 | * no longer be used. |
| 1488 | * |
| 1489 | * Because @port could potentially be freed at any time by the DP MST helpers |
| 1490 | * if &drm_dp_mst_port.malloc_kref reaches 0, including during a call to this |
| 1491 | * function, drivers that which to make use of &struct drm_dp_mst_port should |
| 1492 | * ensure that they grab at least one main malloc reference to their MST ports |
| 1493 | * in &drm_dp_mst_topology_cbs.add_connector. This callback is called before |
| 1494 | * there is any chance for &drm_dp_mst_port.malloc_kref to reach 0. |
| 1495 | * |
| 1496 | * See also: drm_dp_mst_put_port_malloc() |
| 1497 | */ |
| 1498 | void |
| 1499 | drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port) |
| 1500 | { |
| 1501 | kref_get(&port->malloc_kref); |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1502 | drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->malloc_kref)); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1503 | } |
| 1504 | EXPORT_SYMBOL(drm_dp_mst_get_port_malloc); |
| 1505 | |
| 1506 | /** |
| 1507 | * drm_dp_mst_put_port_malloc() - Decrement the malloc refcount of an MST port |
| 1508 | * @port: The &struct drm_dp_mst_port to decrement the malloc refcount of |
| 1509 | * |
| 1510 | * Decrements &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref |
| 1511 | * reaches 0, the memory allocation for @port will be released and @port may |
| 1512 | * no longer be used. |
| 1513 | * |
| 1514 | * See also: drm_dp_mst_get_port_malloc() |
| 1515 | */ |
| 1516 | void |
| 1517 | drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port) |
| 1518 | { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1519 | drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->malloc_kref) - 1); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1520 | kref_put(&port->malloc_kref, drm_dp_free_mst_port); |
| 1521 | } |
| 1522 | EXPORT_SYMBOL(drm_dp_mst_put_port_malloc); |
| 1523 | |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1524 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) |
| 1525 | |
| 1526 | #define STACK_DEPTH 8 |
| 1527 | |
| 1528 | static noinline void |
| 1529 | __topology_ref_save(struct drm_dp_mst_topology_mgr *mgr, |
| 1530 | struct drm_dp_mst_topology_ref_history *history, |
| 1531 | enum drm_dp_mst_topology_ref_type type) |
| 1532 | { |
| 1533 | struct drm_dp_mst_topology_ref_entry *entry = NULL; |
| 1534 | depot_stack_handle_t backtrace; |
| 1535 | ulong stack_entries[STACK_DEPTH]; |
| 1536 | uint n; |
| 1537 | int i; |
| 1538 | |
| 1539 | n = stack_trace_save(stack_entries, ARRAY_SIZE(stack_entries), 1); |
| 1540 | backtrace = stack_depot_save(stack_entries, n, GFP_KERNEL); |
| 1541 | if (!backtrace) |
| 1542 | return; |
| 1543 | |
| 1544 | /* Try to find an existing entry for this backtrace */ |
| 1545 | for (i = 0; i < history->len; i++) { |
| 1546 | if (history->entries[i].backtrace == backtrace) { |
| 1547 | entry = &history->entries[i]; |
| 1548 | break; |
| 1549 | } |
| 1550 | } |
| 1551 | |
| 1552 | /* Otherwise add one */ |
| 1553 | if (!entry) { |
| 1554 | struct drm_dp_mst_topology_ref_entry *new; |
| 1555 | int new_len = history->len + 1; |
| 1556 | |
| 1557 | new = krealloc(history->entries, sizeof(*new) * new_len, |
| 1558 | GFP_KERNEL); |
| 1559 | if (!new) |
| 1560 | return; |
| 1561 | |
| 1562 | entry = &new[history->len]; |
| 1563 | history->len = new_len; |
| 1564 | history->entries = new; |
| 1565 | |
| 1566 | entry->backtrace = backtrace; |
| 1567 | entry->type = type; |
| 1568 | entry->count = 0; |
| 1569 | } |
| 1570 | entry->count++; |
| 1571 | entry->ts_nsec = ktime_get_ns(); |
| 1572 | } |
| 1573 | |
| 1574 | static int |
| 1575 | topology_ref_history_cmp(const void *a, const void *b) |
| 1576 | { |
| 1577 | const struct drm_dp_mst_topology_ref_entry *entry_a = a, *entry_b = b; |
| 1578 | |
| 1579 | if (entry_a->ts_nsec > entry_b->ts_nsec) |
| 1580 | return 1; |
| 1581 | else if (entry_a->ts_nsec < entry_b->ts_nsec) |
| 1582 | return -1; |
| 1583 | else |
| 1584 | return 0; |
| 1585 | } |
| 1586 | |
| 1587 | static inline const char * |
| 1588 | topology_ref_type_to_str(enum drm_dp_mst_topology_ref_type type) |
| 1589 | { |
| 1590 | if (type == DRM_DP_MST_TOPOLOGY_REF_GET) |
| 1591 | return "get"; |
| 1592 | else |
| 1593 | return "put"; |
| 1594 | } |
| 1595 | |
| 1596 | static void |
Jani Nikula | 6470aac | 2024-01-16 15:07:29 +0200 | [diff] [blame] | 1597 | __dump_topology_ref_history(struct drm_device *drm, |
| 1598 | struct drm_dp_mst_topology_ref_history *history, |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1599 | void *ptr, const char *type_str) |
| 1600 | { |
Jani Nikula | 6470aac | 2024-01-16 15:07:29 +0200 | [diff] [blame] | 1601 | struct drm_printer p = drm_dbg_printer(drm, DRM_UT_DP, DBG_PREFIX); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1602 | char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL); |
| 1603 | int i; |
| 1604 | |
| 1605 | if (!buf) |
| 1606 | return; |
| 1607 | |
| 1608 | if (!history->len) |
| 1609 | goto out; |
| 1610 | |
| 1611 | /* First, sort the list so that it goes from oldest to newest |
| 1612 | * reference entry |
| 1613 | */ |
| 1614 | sort(history->entries, history->len, sizeof(*history->entries), |
| 1615 | topology_ref_history_cmp, NULL); |
| 1616 | |
| 1617 | drm_printf(&p, "%s (%p) topology count reached 0, dumping history:\n", |
| 1618 | type_str, ptr); |
| 1619 | |
| 1620 | for (i = 0; i < history->len; i++) { |
| 1621 | const struct drm_dp_mst_topology_ref_entry *entry = |
| 1622 | &history->entries[i]; |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1623 | u64 ts_nsec = entry->ts_nsec; |
Sean Paul | b149cbf | 2019-11-06 14:41:15 -0500 | [diff] [blame] | 1624 | u32 rem_nsec = do_div(ts_nsec, 1000000000); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1625 | |
Imran Khan | 0f68d45 | 2021-11-08 18:33:16 -0800 | [diff] [blame] | 1626 | stack_depot_snprint(entry->backtrace, buf, PAGE_SIZE, 4); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1627 | |
Sean Paul | b149cbf | 2019-11-06 14:41:15 -0500 | [diff] [blame] | 1628 | drm_printf(&p, " %d %ss (last at %5llu.%06u):\n%s", |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1629 | entry->count, |
| 1630 | topology_ref_type_to_str(entry->type), |
| 1631 | ts_nsec, rem_nsec / 1000, buf); |
| 1632 | } |
| 1633 | |
| 1634 | /* Now free the history, since this is the only time we expose it */ |
| 1635 | kfree(history->entries); |
| 1636 | out: |
| 1637 | kfree(buf); |
| 1638 | } |
| 1639 | |
| 1640 | static __always_inline void |
| 1641 | drm_dp_mst_dump_mstb_topology_history(struct drm_dp_mst_branch *mstb) |
| 1642 | { |
Jani Nikula | 6470aac | 2024-01-16 15:07:29 +0200 | [diff] [blame] | 1643 | __dump_topology_ref_history(mstb->mgr->dev, &mstb->topology_ref_history, |
| 1644 | mstb, "MSTB"); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1645 | } |
| 1646 | |
| 1647 | static __always_inline void |
| 1648 | drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port) |
| 1649 | { |
Jani Nikula | 6470aac | 2024-01-16 15:07:29 +0200 | [diff] [blame] | 1650 | __dump_topology_ref_history(port->mgr->dev, &port->topology_ref_history, |
| 1651 | port, "Port"); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1652 | } |
| 1653 | |
| 1654 | static __always_inline void |
| 1655 | save_mstb_topology_ref(struct drm_dp_mst_branch *mstb, |
| 1656 | enum drm_dp_mst_topology_ref_type type) |
| 1657 | { |
| 1658 | __topology_ref_save(mstb->mgr, &mstb->topology_ref_history, type); |
| 1659 | } |
| 1660 | |
| 1661 | static __always_inline void |
| 1662 | save_port_topology_ref(struct drm_dp_mst_port *port, |
| 1663 | enum drm_dp_mst_topology_ref_type type) |
| 1664 | { |
| 1665 | __topology_ref_save(port->mgr, &port->topology_ref_history, type); |
| 1666 | } |
| 1667 | |
| 1668 | static inline void |
| 1669 | topology_ref_history_lock(struct drm_dp_mst_topology_mgr *mgr) |
| 1670 | { |
| 1671 | mutex_lock(&mgr->topology_ref_history_lock); |
| 1672 | } |
| 1673 | |
| 1674 | static inline void |
| 1675 | topology_ref_history_unlock(struct drm_dp_mst_topology_mgr *mgr) |
| 1676 | { |
| 1677 | mutex_unlock(&mgr->topology_ref_history_lock); |
| 1678 | } |
| 1679 | #else |
| 1680 | static inline void |
| 1681 | topology_ref_history_lock(struct drm_dp_mst_topology_mgr *mgr) {} |
| 1682 | static inline void |
| 1683 | topology_ref_history_unlock(struct drm_dp_mst_topology_mgr *mgr) {} |
| 1684 | static inline void |
| 1685 | drm_dp_mst_dump_mstb_topology_history(struct drm_dp_mst_branch *mstb) {} |
| 1686 | static inline void |
| 1687 | drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port) {} |
| 1688 | #define save_mstb_topology_ref(mstb, type) |
| 1689 | #define save_port_topology_ref(port, type) |
| 1690 | #endif |
| 1691 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 1692 | struct drm_dp_mst_atomic_payload * |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 1693 | drm_atomic_get_mst_payload_state(struct drm_dp_mst_topology_state *state, |
| 1694 | struct drm_dp_mst_port *port) |
| 1695 | { |
| 1696 | struct drm_dp_mst_atomic_payload *payload; |
| 1697 | |
| 1698 | list_for_each_entry(payload, &state->payloads, next) |
| 1699 | if (payload->port == port) |
| 1700 | return payload; |
| 1701 | |
| 1702 | return NULL; |
| 1703 | } |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 1704 | EXPORT_SYMBOL(drm_atomic_get_mst_payload_state); |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 1705 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1706 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
| 1707 | { |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1708 | struct drm_dp_mst_branch *mstb = |
| 1709 | container_of(kref, struct drm_dp_mst_branch, topology_kref); |
| 1710 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1711 | |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1712 | drm_dp_mst_dump_mstb_topology_history(mstb); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1713 | |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 1714 | INIT_LIST_HEAD(&mstb->destroy_next); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1715 | |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 1716 | /* |
| 1717 | * This can get called under mgr->mutex, so we need to perform the |
| 1718 | * actual destruction of the mstb in another worker |
| 1719 | */ |
| 1720 | mutex_lock(&mgr->delayed_destroy_lock); |
| 1721 | list_add(&mstb->destroy_next, &mgr->destroy_branch_device_list); |
| 1722 | mutex_unlock(&mgr->delayed_destroy_lock); |
Imre Deak | 72822c3 | 2020-06-10 16:47:04 +0300 | [diff] [blame] | 1723 | queue_work(mgr->delayed_destroy_wq, &mgr->delayed_destroy_work); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1724 | } |
| 1725 | |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1726 | /** |
| 1727 | * drm_dp_mst_topology_try_get_mstb() - Increment the topology refcount of a |
Matt Roper | 1e55a53 | 2019-02-01 17:23:26 -0800 | [diff] [blame] | 1728 | * branch device unless it's zero |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1729 | * @mstb: &struct drm_dp_mst_branch to increment the topology refcount of |
| 1730 | * |
| 1731 | * Attempts to grab a topology reference to @mstb, if it hasn't yet been |
| 1732 | * removed from the topology (e.g. &drm_dp_mst_branch.topology_kref has |
| 1733 | * reached 0). Holding a topology reference implies that a malloc reference |
| 1734 | * will be held to @mstb as long as the user holds the topology reference. |
| 1735 | * |
| 1736 | * Care should be taken to ensure that the user has at least one malloc |
| 1737 | * reference to @mstb. If you already have a topology reference to @mstb, you |
| 1738 | * should use drm_dp_mst_topology_get_mstb() instead. |
| 1739 | * |
| 1740 | * See also: |
| 1741 | * drm_dp_mst_topology_get_mstb() |
| 1742 | * drm_dp_mst_topology_put_mstb() |
| 1743 | * |
| 1744 | * Returns: |
| 1745 | * * 1: A topology reference was grabbed successfully |
| 1746 | * * 0: @port is no longer in the topology, no reference was grabbed |
| 1747 | */ |
| 1748 | static int __must_check |
| 1749 | drm_dp_mst_topology_try_get_mstb(struct drm_dp_mst_branch *mstb) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1750 | { |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1751 | int ret; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1752 | |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1753 | topology_ref_history_lock(mstb->mgr); |
| 1754 | ret = kref_get_unless_zero(&mstb->topology_kref); |
| 1755 | if (ret) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1756 | drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref)); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1757 | save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_GET); |
| 1758 | } |
| 1759 | |
| 1760 | topology_ref_history_unlock(mstb->mgr); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1761 | |
| 1762 | return ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1763 | } |
| 1764 | |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1765 | /** |
| 1766 | * drm_dp_mst_topology_get_mstb() - Increment the topology refcount of a |
| 1767 | * branch device |
| 1768 | * @mstb: The &struct drm_dp_mst_branch to increment the topology refcount of |
| 1769 | * |
| 1770 | * Increments &drm_dp_mst_branch.topology_refcount without checking whether or |
| 1771 | * not it's already reached 0. This is only valid to use in scenarios where |
| 1772 | * you are already guaranteed to have at least one active topology reference |
| 1773 | * to @mstb. Otherwise, drm_dp_mst_topology_try_get_mstb() must be used. |
| 1774 | * |
| 1775 | * See also: |
| 1776 | * drm_dp_mst_topology_try_get_mstb() |
| 1777 | * drm_dp_mst_topology_put_mstb() |
| 1778 | */ |
| 1779 | static void drm_dp_mst_topology_get_mstb(struct drm_dp_mst_branch *mstb) |
| 1780 | { |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1781 | topology_ref_history_lock(mstb->mgr); |
| 1782 | |
| 1783 | save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_GET); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1784 | WARN_ON(kref_read(&mstb->topology_kref) == 0); |
| 1785 | kref_get(&mstb->topology_kref); |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1786 | drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref)); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1787 | |
| 1788 | topology_ref_history_unlock(mstb->mgr); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1789 | } |
| 1790 | |
| 1791 | /** |
| 1792 | * drm_dp_mst_topology_put_mstb() - release a topology reference to a branch |
| 1793 | * device |
| 1794 | * @mstb: The &struct drm_dp_mst_branch to release the topology reference from |
| 1795 | * |
| 1796 | * Releases a topology reference from @mstb by decrementing |
| 1797 | * &drm_dp_mst_branch.topology_kref. |
| 1798 | * |
| 1799 | * See also: |
| 1800 | * drm_dp_mst_topology_try_get_mstb() |
| 1801 | * drm_dp_mst_topology_get_mstb() |
| 1802 | */ |
| 1803 | static void |
| 1804 | drm_dp_mst_topology_put_mstb(struct drm_dp_mst_branch *mstb) |
| 1805 | { |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1806 | topology_ref_history_lock(mstb->mgr); |
| 1807 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1808 | drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref) - 1); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1809 | save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_PUT); |
| 1810 | |
| 1811 | topology_ref_history_unlock(mstb->mgr); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1812 | kref_put(&mstb->topology_kref, drm_dp_destroy_mst_branch_device); |
| 1813 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1814 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1815 | static void drm_dp_destroy_port(struct kref *kref) |
| 1816 | { |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1817 | struct drm_dp_mst_port *port = |
| 1818 | container_of(kref, struct drm_dp_mst_port, topology_kref); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1819 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 1820 | |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1821 | drm_dp_mst_dump_port_topology_history(port); |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 1822 | |
Lyude Paul | d29333c | 2019-03-10 18:59:10 -0400 | [diff] [blame] | 1823 | /* There's nothing that needs locking to destroy an input port yet */ |
| 1824 | if (port->input) { |
| 1825 | drm_dp_mst_put_port_malloc(port); |
| 1826 | return; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1827 | } |
Lyude Paul | d29333c | 2019-03-10 18:59:10 -0400 | [diff] [blame] | 1828 | |
Jani Nikula | c1c9042 | 2023-05-30 12:08:24 +0300 | [diff] [blame] | 1829 | drm_edid_free(port->cached_edid); |
Lyude Paul | d29333c | 2019-03-10 18:59:10 -0400 | [diff] [blame] | 1830 | |
| 1831 | /* |
| 1832 | * we can't destroy the connector here, as we might be holding the |
| 1833 | * mode_config.mutex from an EDID retrieval |
| 1834 | */ |
| 1835 | mutex_lock(&mgr->delayed_destroy_lock); |
| 1836 | list_add(&port->next, &mgr->destroy_port_list); |
| 1837 | mutex_unlock(&mgr->delayed_destroy_lock); |
Imre Deak | 72822c3 | 2020-06-10 16:47:04 +0300 | [diff] [blame] | 1838 | queue_work(mgr->delayed_destroy_wq, &mgr->delayed_destroy_work); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1839 | } |
| 1840 | |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1841 | /** |
| 1842 | * drm_dp_mst_topology_try_get_port() - Increment the topology refcount of a |
Matt Roper | 1e55a53 | 2019-02-01 17:23:26 -0800 | [diff] [blame] | 1843 | * port unless it's zero |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1844 | * @port: &struct drm_dp_mst_port to increment the topology refcount of |
| 1845 | * |
| 1846 | * Attempts to grab a topology reference to @port, if it hasn't yet been |
| 1847 | * removed from the topology (e.g. &drm_dp_mst_port.topology_kref has reached |
| 1848 | * 0). Holding a topology reference implies that a malloc reference will be |
| 1849 | * held to @port as long as the user holds the topology reference. |
| 1850 | * |
| 1851 | * Care should be taken to ensure that the user has at least one malloc |
| 1852 | * reference to @port. If you already have a topology reference to @port, you |
| 1853 | * should use drm_dp_mst_topology_get_port() instead. |
| 1854 | * |
| 1855 | * See also: |
| 1856 | * drm_dp_mst_topology_get_port() |
| 1857 | * drm_dp_mst_topology_put_port() |
| 1858 | * |
| 1859 | * Returns: |
| 1860 | * * 1: A topology reference was grabbed successfully |
| 1861 | * * 0: @port is no longer in the topology, no reference was grabbed |
| 1862 | */ |
| 1863 | static int __must_check |
| 1864 | drm_dp_mst_topology_try_get_port(struct drm_dp_mst_port *port) |
| 1865 | { |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1866 | int ret; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1867 | |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1868 | topology_ref_history_lock(port->mgr); |
| 1869 | ret = kref_get_unless_zero(&port->topology_kref); |
| 1870 | if (ret) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1871 | drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref)); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1872 | save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_GET); |
| 1873 | } |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1874 | |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1875 | topology_ref_history_unlock(port->mgr); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1876 | return ret; |
| 1877 | } |
| 1878 | |
| 1879 | /** |
| 1880 | * drm_dp_mst_topology_get_port() - Increment the topology refcount of a port |
| 1881 | * @port: The &struct drm_dp_mst_port to increment the topology refcount of |
| 1882 | * |
| 1883 | * Increments &drm_dp_mst_port.topology_refcount without checking whether or |
| 1884 | * not it's already reached 0. This is only valid to use in scenarios where |
| 1885 | * you are already guaranteed to have at least one active topology reference |
| 1886 | * to @port. Otherwise, drm_dp_mst_topology_try_get_port() must be used. |
| 1887 | * |
| 1888 | * See also: |
| 1889 | * drm_dp_mst_topology_try_get_port() |
| 1890 | * drm_dp_mst_topology_put_port() |
| 1891 | */ |
| 1892 | static void drm_dp_mst_topology_get_port(struct drm_dp_mst_port *port) |
| 1893 | { |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1894 | topology_ref_history_lock(port->mgr); |
| 1895 | |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1896 | WARN_ON(kref_read(&port->topology_kref) == 0); |
| 1897 | kref_get(&port->topology_kref); |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1898 | drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref)); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1899 | save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_GET); |
| 1900 | |
| 1901 | topology_ref_history_unlock(port->mgr); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1902 | } |
| 1903 | |
| 1904 | /** |
| 1905 | * drm_dp_mst_topology_put_port() - release a topology reference to a port |
| 1906 | * @port: The &struct drm_dp_mst_port to release the topology reference from |
| 1907 | * |
| 1908 | * Releases a topology reference from @port by decrementing |
| 1909 | * &drm_dp_mst_port.topology_kref. |
| 1910 | * |
| 1911 | * See also: |
| 1912 | * drm_dp_mst_topology_try_get_port() |
| 1913 | * drm_dp_mst_topology_get_port() |
| 1914 | */ |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 1915 | static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1916 | { |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1917 | topology_ref_history_lock(port->mgr); |
| 1918 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 1919 | drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref) - 1); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 1920 | save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_PUT); |
| 1921 | |
| 1922 | topology_ref_history_unlock(port->mgr); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1923 | kref_put(&port->topology_kref, drm_dp_destroy_port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1924 | } |
| 1925 | |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 1926 | static struct drm_dp_mst_branch * |
| 1927 | drm_dp_mst_topology_get_mstb_validated_locked(struct drm_dp_mst_branch *mstb, |
| 1928 | struct drm_dp_mst_branch *to_find) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1929 | { |
| 1930 | struct drm_dp_mst_port *port; |
| 1931 | struct drm_dp_mst_branch *rmstb; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1932 | |
| 1933 | if (to_find == mstb) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1934 | return mstb; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1935 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1936 | list_for_each_entry(port, &mstb->ports, next) { |
| 1937 | if (port->mstb) { |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 1938 | rmstb = drm_dp_mst_topology_get_mstb_validated_locked( |
| 1939 | port->mstb, to_find); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1940 | if (rmstb) |
| 1941 | return rmstb; |
| 1942 | } |
| 1943 | } |
| 1944 | return NULL; |
| 1945 | } |
| 1946 | |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 1947 | static struct drm_dp_mst_branch * |
| 1948 | drm_dp_mst_topology_get_mstb_validated(struct drm_dp_mst_topology_mgr *mgr, |
| 1949 | struct drm_dp_mst_branch *mstb) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1950 | { |
| 1951 | struct drm_dp_mst_branch *rmstb = NULL; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1952 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1953 | mutex_lock(&mgr->lock); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1954 | if (mgr->mst_primary) { |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 1955 | rmstb = drm_dp_mst_topology_get_mstb_validated_locked( |
| 1956 | mgr->mst_primary, mstb); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1957 | |
| 1958 | if (rmstb && !drm_dp_mst_topology_try_get_mstb(rmstb)) |
| 1959 | rmstb = NULL; |
| 1960 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1961 | mutex_unlock(&mgr->lock); |
| 1962 | return rmstb; |
| 1963 | } |
| 1964 | |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1965 | static struct drm_dp_mst_port * |
| 1966 | drm_dp_mst_topology_get_port_validated_locked(struct drm_dp_mst_branch *mstb, |
| 1967 | struct drm_dp_mst_port *to_find) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1968 | { |
| 1969 | struct drm_dp_mst_port *port, *mport; |
| 1970 | |
| 1971 | list_for_each_entry(port, &mstb->ports, next) { |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1972 | if (port == to_find) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1973 | return port; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1974 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1975 | if (port->mstb) { |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1976 | mport = drm_dp_mst_topology_get_port_validated_locked( |
| 1977 | port->mstb, to_find); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1978 | if (mport) |
| 1979 | return mport; |
| 1980 | } |
| 1981 | } |
| 1982 | return NULL; |
| 1983 | } |
| 1984 | |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 1985 | static struct drm_dp_mst_port * |
| 1986 | drm_dp_mst_topology_get_port_validated(struct drm_dp_mst_topology_mgr *mgr, |
| 1987 | struct drm_dp_mst_port *port) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1988 | { |
| 1989 | struct drm_dp_mst_port *rport = NULL; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1990 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1991 | mutex_lock(&mgr->lock); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 1992 | if (mgr->mst_primary) { |
| 1993 | rport = drm_dp_mst_topology_get_port_validated_locked( |
| 1994 | mgr->mst_primary, port); |
| 1995 | |
| 1996 | if (rport && !drm_dp_mst_topology_try_get_port(rport)) |
| 1997 | rport = NULL; |
| 1998 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1999 | mutex_unlock(&mgr->lock); |
| 2000 | return rport; |
| 2001 | } |
| 2002 | |
| 2003 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) |
| 2004 | { |
| 2005 | struct drm_dp_mst_port *port; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 2006 | int ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2007 | |
| 2008 | list_for_each_entry(port, &mstb->ports, next) { |
| 2009 | if (port->port_num == port_num) { |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 2010 | ret = drm_dp_mst_topology_try_get_port(port); |
| 2011 | return ret ? port : NULL; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2012 | } |
| 2013 | } |
| 2014 | |
| 2015 | return NULL; |
| 2016 | } |
| 2017 | |
| 2018 | /* |
| 2019 | * calculate a new RAD for this MST branch device |
| 2020 | * if parent has an LCT of 2 then it has 1 nibble of RAD, |
| 2021 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, |
| 2022 | */ |
| 2023 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, |
| 2024 | u8 *rad) |
| 2025 | { |
Mykola Lysenko | 75af4c8 | 2015-12-25 16:14:47 +0800 | [diff] [blame] | 2026 | int parent_lct = port->parent->lct; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2027 | int shift = 4; |
Mykola Lysenko | 75af4c8 | 2015-12-25 16:14:47 +0800 | [diff] [blame] | 2028 | int idx = (parent_lct - 1) / 2; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 2029 | |
Mykola Lysenko | 75af4c8 | 2015-12-25 16:14:47 +0800 | [diff] [blame] | 2030 | if (parent_lct > 1) { |
| 2031 | memcpy(rad, port->parent->rad, idx + 1); |
| 2032 | shift = (parent_lct % 2) ? 4 : 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2033 | } else |
| 2034 | rad[0] = 0; |
| 2035 | |
| 2036 | rad[idx] |= port->port_num << shift; |
Mykola Lysenko | 75af4c8 | 2015-12-25 16:14:47 +0800 | [diff] [blame] | 2037 | return parent_lct + 1; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2038 | } |
| 2039 | |
Lyude Paul | b2feb1d | 2020-03-06 18:46:19 -0500 | [diff] [blame] | 2040 | static bool drm_dp_mst_is_end_device(u8 pdt, bool mcs) |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2041 | { |
| 2042 | switch (pdt) { |
| 2043 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
| 2044 | case DP_PEER_DEVICE_SST_SINK: |
| 2045 | return true; |
| 2046 | case DP_PEER_DEVICE_MST_BRANCHING: |
| 2047 | /* For sst branch device */ |
| 2048 | if (!mcs) |
| 2049 | return true; |
| 2050 | |
| 2051 | return false; |
| 2052 | } |
| 2053 | return true; |
| 2054 | } |
| 2055 | |
| 2056 | static int |
| 2057 | drm_dp_port_set_pdt(struct drm_dp_mst_port *port, u8 new_pdt, |
| 2058 | bool new_mcs) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2059 | { |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2060 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 2061 | struct drm_dp_mst_branch *mstb; |
| 2062 | u8 rad[8], lct; |
| 2063 | int ret = 0; |
| 2064 | |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2065 | if (port->pdt == new_pdt && port->mcs == new_mcs) |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2066 | return 0; |
| 2067 | |
| 2068 | /* Teardown the old pdt, if there is one */ |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2069 | if (port->pdt != DP_PEER_DEVICE_NONE) { |
Lyude Paul | b2feb1d | 2020-03-06 18:46:19 -0500 | [diff] [blame] | 2070 | if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) { |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2071 | /* |
| 2072 | * If the new PDT would also have an i2c bus, |
| 2073 | * don't bother with reregistering it |
| 2074 | */ |
| 2075 | if (new_pdt != DP_PEER_DEVICE_NONE && |
Lyude Paul | b2feb1d | 2020-03-06 18:46:19 -0500 | [diff] [blame] | 2076 | drm_dp_mst_is_end_device(new_pdt, new_mcs)) { |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2077 | port->pdt = new_pdt; |
| 2078 | port->mcs = new_mcs; |
| 2079 | return 0; |
| 2080 | } |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2081 | |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2082 | /* remove i2c over sideband */ |
Imre Deak | d8bd15b | 2020-06-08 00:25:21 +0300 | [diff] [blame] | 2083 | drm_dp_mst_unregister_i2c_bus(port); |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2084 | } else { |
| 2085 | mutex_lock(&mgr->lock); |
| 2086 | drm_dp_mst_topology_put_mstb(port->mstb); |
| 2087 | port->mstb = NULL; |
| 2088 | mutex_unlock(&mgr->lock); |
| 2089 | } |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2090 | } |
| 2091 | |
| 2092 | port->pdt = new_pdt; |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2093 | port->mcs = new_mcs; |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2094 | |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2095 | if (port->pdt != DP_PEER_DEVICE_NONE) { |
Lyude Paul | b2feb1d | 2020-03-06 18:46:19 -0500 | [diff] [blame] | 2096 | if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) { |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2097 | /* add i2c over sideband */ |
Imre Deak | d8bd15b | 2020-06-08 00:25:21 +0300 | [diff] [blame] | 2098 | ret = drm_dp_mst_register_i2c_bus(port); |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2099 | } else { |
| 2100 | lct = drm_dp_calculate_rad(port, rad); |
| 2101 | mstb = drm_dp_add_mst_branch_device(lct, rad); |
| 2102 | if (!mstb) { |
| 2103 | ret = -ENOMEM; |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2104 | drm_err(mgr->dev, "Failed to create MSTB for port %p", port); |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2105 | goto out; |
| 2106 | } |
| 2107 | |
| 2108 | mutex_lock(&mgr->lock); |
| 2109 | port->mstb = mstb; |
| 2110 | mstb->mgr = port->mgr; |
| 2111 | mstb->port_parent = port; |
| 2112 | |
| 2113 | /* |
| 2114 | * Make sure this port's memory allocation stays |
| 2115 | * around until its child MSTB releases it |
| 2116 | */ |
| 2117 | drm_dp_mst_get_port_malloc(port); |
| 2118 | mutex_unlock(&mgr->lock); |
| 2119 | |
| 2120 | /* And make sure we send a link address for this */ |
| 2121 | ret = 1; |
Joe Moriarty | 22a0703 | 2018-02-12 14:51:42 -0500 | [diff] [blame] | 2122 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2123 | } |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2124 | |
| 2125 | out: |
| 2126 | if (ret < 0) |
| 2127 | port->pdt = DP_PEER_DEVICE_NONE; |
| 2128 | return ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2129 | } |
| 2130 | |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 2131 | /** |
| 2132 | * drm_dp_mst_dpcd_read() - read a series of bytes from the DPCD via sideband |
| 2133 | * @aux: Fake sideband AUX CH |
| 2134 | * @offset: address of the (first) register to read |
| 2135 | * @buffer: buffer to store the register values |
| 2136 | * @size: number of bytes in @buffer |
| 2137 | * |
| 2138 | * Performs the same functionality for remote devices via |
| 2139 | * sideband messaging as drm_dp_dpcd_read() does for local |
| 2140 | * devices via actual AUX CH. |
| 2141 | * |
| 2142 | * Return: Number of bytes read, or negative error code on failure. |
| 2143 | */ |
| 2144 | ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux, |
| 2145 | unsigned int offset, void *buffer, size_t size) |
| 2146 | { |
| 2147 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, |
| 2148 | aux); |
| 2149 | |
| 2150 | return drm_dp_send_dpcd_read(port->mgr, port, |
| 2151 | offset, size, buffer); |
| 2152 | } |
| 2153 | |
| 2154 | /** |
| 2155 | * drm_dp_mst_dpcd_write() - write a series of bytes to the DPCD via sideband |
| 2156 | * @aux: Fake sideband AUX CH |
| 2157 | * @offset: address of the (first) register to write |
| 2158 | * @buffer: buffer containing the values to write |
| 2159 | * @size: number of bytes in @buffer |
| 2160 | * |
| 2161 | * Performs the same functionality for remote devices via |
| 2162 | * sideband messaging as drm_dp_dpcd_write() does for local |
| 2163 | * devices via actual AUX CH. |
| 2164 | * |
Lyude Paul | 4c0a9b6 | 2020-03-06 18:49:21 -0500 | [diff] [blame] | 2165 | * Return: number of bytes written on success, negative error code on failure. |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 2166 | */ |
| 2167 | ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux, |
| 2168 | unsigned int offset, void *buffer, size_t size) |
| 2169 | { |
| 2170 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, |
| 2171 | aux); |
| 2172 | |
| 2173 | return drm_dp_send_dpcd_write(port->mgr, port, |
| 2174 | offset, size, buffer); |
| 2175 | } |
| 2176 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2177 | static int drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2178 | { |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2179 | int ret = 0; |
Hersen Wu | 5e93b82 | 2016-01-22 17:07:28 -0500 | [diff] [blame] | 2180 | |
| 2181 | memcpy(mstb->guid, guid, 16); |
| 2182 | |
| 2183 | if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { |
| 2184 | if (mstb->port_parent) { |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2185 | ret = drm_dp_send_dpcd_write(mstb->mgr, |
| 2186 | mstb->port_parent, |
| 2187 | DP_GUID, 16, mstb->guid); |
Hersen Wu | 5e93b82 | 2016-01-22 17:07:28 -0500 | [diff] [blame] | 2188 | } else { |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2189 | ret = drm_dp_dpcd_write(mstb->mgr->aux, |
| 2190 | DP_GUID, mstb->guid, 16); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2191 | } |
| 2192 | } |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2193 | |
Lyude Paul | 94b6ada | 2020-03-06 18:49:22 -0500 | [diff] [blame] | 2194 | if (ret < 16 && ret > 0) |
| 2195 | return -EPROTO; |
| 2196 | |
| 2197 | return ret == 16 ? 0 : ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2198 | } |
| 2199 | |
Dave Airlie | 1c96087 | 2015-09-16 11:04:49 +1000 | [diff] [blame] | 2200 | static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, |
| 2201 | int pnum, |
Rickard Strandqvist | d87af4d | 2014-10-12 00:02:32 +0200 | [diff] [blame] | 2202 | char *proppath, |
| 2203 | size_t proppath_size) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2204 | { |
| 2205 | int i; |
| 2206 | char temp[8]; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 2207 | |
Rickard Strandqvist | d87af4d | 2014-10-12 00:02:32 +0200 | [diff] [blame] | 2208 | snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2209 | for (i = 0; i < (mstb->lct - 1); i++) { |
| 2210 | int shift = (i % 2) ? 0 : 4; |
Mykola Lysenko | 7a11a33 | 2015-12-25 16:14:48 +0800 | [diff] [blame] | 2211 | int port_num = (mstb->rad[i / 2] >> shift) & 0xf; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 2212 | |
Rickard Strandqvist | d87af4d | 2014-10-12 00:02:32 +0200 | [diff] [blame] | 2213 | snprintf(temp, sizeof(temp), "-%d", port_num); |
| 2214 | strlcat(proppath, temp, proppath_size); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2215 | } |
Dave Airlie | 1c96087 | 2015-09-16 11:04:49 +1000 | [diff] [blame] | 2216 | snprintf(temp, sizeof(temp), "-%d", pnum); |
Rickard Strandqvist | d87af4d | 2014-10-12 00:02:32 +0200 | [diff] [blame] | 2217 | strlcat(proppath, temp, proppath_size); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2218 | } |
| 2219 | |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 2220 | /** |
| 2221 | * drm_dp_mst_connector_late_register() - Late MST connector registration |
Sean Paul | 63b87c3 | 2019-07-26 10:20:47 -0400 | [diff] [blame] | 2222 | * @connector: The MST connector |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 2223 | * @port: The MST port for this connector |
| 2224 | * |
| 2225 | * Helper to register the remote aux device for this MST port. Drivers should |
| 2226 | * call this from their mst connector's late_register hook to enable MST aux |
| 2227 | * devices. |
| 2228 | * |
| 2229 | * Return: 0 on success, negative error code on failure. |
| 2230 | */ |
| 2231 | int drm_dp_mst_connector_late_register(struct drm_connector *connector, |
| 2232 | struct drm_dp_mst_port *port) |
| 2233 | { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2234 | drm_dbg_kms(port->mgr->dev, "registering %s remote bus for %s\n", |
| 2235 | port->aux.name, connector->kdev->kobj.name); |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 2236 | |
| 2237 | port->aux.dev = connector->kdev; |
| 2238 | return drm_dp_aux_register_devnode(&port->aux); |
| 2239 | } |
| 2240 | EXPORT_SYMBOL(drm_dp_mst_connector_late_register); |
| 2241 | |
| 2242 | /** |
| 2243 | * drm_dp_mst_connector_early_unregister() - Early MST connector unregistration |
Sean Paul | 63b87c3 | 2019-07-26 10:20:47 -0400 | [diff] [blame] | 2244 | * @connector: The MST connector |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 2245 | * @port: The MST port for this connector |
| 2246 | * |
| 2247 | * Helper to unregister the remote aux device for this MST port, registered by |
| 2248 | * drm_dp_mst_connector_late_register(). Drivers should call this from their mst |
| 2249 | * connector's early_unregister hook. |
| 2250 | */ |
| 2251 | void drm_dp_mst_connector_early_unregister(struct drm_connector *connector, |
| 2252 | struct drm_dp_mst_port *port) |
| 2253 | { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2254 | drm_dbg_kms(port->mgr->dev, "unregistering %s remote bus for %s\n", |
| 2255 | port->aux.name, connector->kdev->kobj.name); |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 2256 | drm_dp_aux_unregister_devnode(&port->aux); |
| 2257 | } |
| 2258 | EXPORT_SYMBOL(drm_dp_mst_connector_early_unregister); |
| 2259 | |
Lyude Paul | e2839ff | 2019-09-03 16:45:55 -0400 | [diff] [blame] | 2260 | static void |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2261 | drm_dp_mst_port_add_connector(struct drm_dp_mst_branch *mstb, |
| 2262 | struct drm_dp_mst_port *port) |
| 2263 | { |
| 2264 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 2265 | char proppath[255]; |
| 2266 | int ret; |
| 2267 | |
| 2268 | build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); |
| 2269 | port->connector = mgr->cbs->add_connector(mgr, port, proppath); |
| 2270 | if (!port->connector) { |
| 2271 | ret = -ENOMEM; |
| 2272 | goto error; |
| 2273 | } |
| 2274 | |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2275 | if (port->pdt != DP_PEER_DEVICE_NONE && |
Imre Deak | 4b8878e | 2021-02-01 14:01:43 +0200 | [diff] [blame] | 2276 | drm_dp_mst_is_end_device(port->pdt, port->mcs) && |
Imre Deak | ca5d9d7 | 2024-04-17 01:10:07 +0300 | [diff] [blame] | 2277 | drm_dp_mst_port_is_logical(port)) |
Jani Nikula | c1c9042 | 2023-05-30 12:08:24 +0300 | [diff] [blame] | 2278 | port->cached_edid = drm_edid_read_ddc(port->connector, |
| 2279 | &port->aux.ddc); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2280 | |
Pankaj Bharadiya | f8d97d9 | 2020-03-07 14:00:19 +0530 | [diff] [blame] | 2281 | drm_connector_register(port->connector); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2282 | return; |
| 2283 | |
| 2284 | error: |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2285 | drm_err(mgr->dev, "Failed to create connector for port %p: %d\n", port, ret); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2286 | } |
| 2287 | |
| 2288 | /* |
| 2289 | * Drop a topology reference, and unlink the port from the in-memory topology |
| 2290 | * layout |
| 2291 | */ |
| 2292 | static void |
| 2293 | drm_dp_mst_topology_unlink_port(struct drm_dp_mst_topology_mgr *mgr, |
| 2294 | struct drm_dp_mst_port *port) |
| 2295 | { |
| 2296 | mutex_lock(&mgr->lock); |
David Francis | b1dee9a7 | 2019-07-25 11:47:46 -0400 | [diff] [blame] | 2297 | port->parent->num_ports--; |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2298 | list_del(&port->next); |
| 2299 | mutex_unlock(&mgr->lock); |
| 2300 | drm_dp_mst_topology_put_port(port); |
| 2301 | } |
| 2302 | |
| 2303 | static struct drm_dp_mst_port * |
| 2304 | drm_dp_mst_add_port(struct drm_device *dev, |
| 2305 | struct drm_dp_mst_topology_mgr *mgr, |
| 2306 | struct drm_dp_mst_branch *mstb, u8 port_number) |
| 2307 | { |
| 2308 | struct drm_dp_mst_port *port = kzalloc(sizeof(*port), GFP_KERNEL); |
| 2309 | |
| 2310 | if (!port) |
| 2311 | return NULL; |
| 2312 | |
| 2313 | kref_init(&port->topology_kref); |
| 2314 | kref_init(&port->malloc_kref); |
| 2315 | port->parent = mstb; |
| 2316 | port->port_num = port_number; |
| 2317 | port->mgr = mgr; |
| 2318 | port->aux.name = "DPMST"; |
| 2319 | port->aux.dev = dev->dev; |
| 2320 | port->aux.is_remote = true; |
| 2321 | |
David (Dingchen) Zhang | c908b1c | 2019-12-06 17:56:37 -0500 | [diff] [blame] | 2322 | /* initialize the MST downstream port's AUX crc work queue */ |
Lyude Paul | 6cba3fe | 2021-04-23 14:42:55 -0400 | [diff] [blame] | 2323 | port->aux.drm_dev = dev; |
David (Dingchen) Zhang | c908b1c | 2019-12-06 17:56:37 -0500 | [diff] [blame] | 2324 | drm_dp_remote_aux_init(&port->aux); |
| 2325 | |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2326 | /* |
| 2327 | * Make sure the memory allocation for our parent branch stays |
| 2328 | * around until our own memory allocation is released |
| 2329 | */ |
| 2330 | drm_dp_mst_get_mstb_malloc(mstb); |
| 2331 | |
| 2332 | return port; |
| 2333 | } |
| 2334 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2335 | static int |
Lyude Paul | e2839ff | 2019-09-03 16:45:55 -0400 | [diff] [blame] | 2336 | drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, |
| 2337 | struct drm_device *dev, |
| 2338 | struct drm_dp_link_addr_reply_port *port_msg) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2339 | { |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2340 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2341 | struct drm_dp_mst_port *port; |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2342 | int old_ddps = 0, ret; |
| 2343 | u8 new_pdt = DP_PEER_DEVICE_NONE; |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2344 | bool new_mcs = 0; |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2345 | bool created = false, send_link_addr = false, changed = false; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 2346 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2347 | port = drm_dp_get_port(mstb, port_msg->port_number); |
| 2348 | if (!port) { |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2349 | port = drm_dp_mst_add_port(dev, mgr, mstb, |
| 2350 | port_msg->port_number); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2351 | if (!port) |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2352 | return -ENOMEM; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2353 | created = true; |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2354 | changed = true; |
| 2355 | } else if (!port->input && port_msg->input_port && port->connector) { |
| 2356 | /* Since port->connector can't be changed here, we create a |
| 2357 | * new port if input_port changes from 0 to 1 |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2358 | */ |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2359 | drm_dp_mst_topology_unlink_port(mgr, port); |
| 2360 | drm_dp_mst_topology_put_port(port); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2361 | port = drm_dp_mst_add_port(dev, mgr, mstb, |
| 2362 | port_msg->port_number); |
| 2363 | if (!port) |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2364 | return -ENOMEM; |
| 2365 | changed = true; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2366 | created = true; |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2367 | } else if (port->input && !port_msg->input_port) { |
| 2368 | changed = true; |
| 2369 | } else if (port->connector) { |
| 2370 | /* We're updating a port that's exposed to userspace, so do it |
| 2371 | * under lock |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2372 | */ |
| 2373 | drm_modeset_lock(&mgr->base.lock, NULL); |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2374 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2375 | old_ddps = port->ddps; |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2376 | changed = port->ddps != port_msg->ddps || |
| 2377 | (port->ddps && |
| 2378 | (port->ldps != port_msg->legacy_device_plug_status || |
| 2379 | port->dpcd_rev != port_msg->dpcd_revision || |
| 2380 | port->mcs != port_msg->mcs || |
| 2381 | port->pdt != port_msg->peer_device_type || |
| 2382 | port->num_sdp_stream_sinks != |
| 2383 | port_msg->num_sdp_stream_sinks)); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2384 | } |
| 2385 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2386 | port->input = port_msg->input_port; |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2387 | if (!port->input) |
| 2388 | new_pdt = port_msg->peer_device_type; |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2389 | new_mcs = port_msg->mcs; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2390 | port->ddps = port_msg->ddps; |
| 2391 | port->ldps = port_msg->legacy_device_plug_status; |
| 2392 | port->dpcd_rev = port_msg->dpcd_revision; |
| 2393 | port->num_sdp_streams = port_msg->num_sdp_streams; |
| 2394 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2395 | |
| 2396 | /* manage mstb port lists with mgr lock - take a reference |
| 2397 | for this list */ |
| 2398 | if (created) { |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2399 | mutex_lock(&mgr->lock); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 2400 | drm_dp_mst_topology_get_port(port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2401 | list_add(&port->next, &mstb->ports); |
David Francis | b1dee9a7 | 2019-07-25 11:47:46 -0400 | [diff] [blame] | 2402 | mstb->num_ports++; |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2403 | mutex_unlock(&mgr->lock); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2404 | } |
| 2405 | |
Lyude Paul | 87212b5 | 2020-03-06 18:46:21 -0500 | [diff] [blame] | 2406 | /* |
| 2407 | * Reprobe PBN caps on both hotplug, and when re-probing the link |
| 2408 | * for our parent mstb |
| 2409 | */ |
| 2410 | if (old_ddps != port->ddps || !created) { |
| 2411 | if (port->ddps && !port->input) { |
| 2412 | ret = drm_dp_send_enum_path_resources(mgr, mstb, |
| 2413 | port); |
| 2414 | if (ret == 1) |
| 2415 | changed = true; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2416 | } else { |
Lyude Paul | fcf4638 | 2020-03-06 18:46:20 -0500 | [diff] [blame] | 2417 | port->full_pbn = 0; |
Lyude Paul | 3d76df6 | 2019-01-10 19:53:24 -0500 | [diff] [blame] | 2418 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2419 | } |
| 2420 | |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2421 | ret = drm_dp_port_set_pdt(port, new_pdt, new_mcs); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2422 | if (ret == 1) { |
| 2423 | send_link_addr = true; |
| 2424 | } else if (ret < 0) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2425 | drm_err(dev, "Failed to change PDT on port %p: %d\n", port, ret); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2426 | goto fail; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2427 | } |
| 2428 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2429 | /* |
| 2430 | * If this port wasn't just created, then we're reprobing because |
| 2431 | * we're coming out of suspend. In this case, always resend the link |
| 2432 | * address if there's an MSTB on this port |
| 2433 | */ |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2434 | if (!created && port->pdt == DP_PEER_DEVICE_MST_BRANCHING && |
| 2435 | port->mcs) |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2436 | send_link_addr = true; |
Dave Airlie | 1c96087 | 2015-09-16 11:04:49 +1000 | [diff] [blame] | 2437 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2438 | if (port->connector) |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2439 | drm_modeset_unlock(&mgr->base.lock); |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2440 | else if (!port->input) |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2441 | drm_dp_mst_port_add_connector(mstb, port); |
Dave Airlie | 1c96087 | 2015-09-16 11:04:49 +1000 | [diff] [blame] | 2442 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2443 | if (send_link_addr && port->mstb) { |
| 2444 | ret = drm_dp_send_link_address(mgr, port->mstb); |
| 2445 | if (ret == 1) /* MSTB below us changed */ |
| 2446 | changed = true; |
| 2447 | else if (ret < 0) |
| 2448 | goto fail_put; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2449 | } |
Dave Airlie | 8ae22cb | 2016-02-17 11:36:38 +1000 | [diff] [blame] | 2450 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2451 | /* put reference to this port */ |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 2452 | drm_dp_mst_topology_put_port(port); |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2453 | return changed; |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2454 | |
| 2455 | fail: |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2456 | drm_dp_mst_topology_unlink_port(mgr, port); |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2457 | if (port->connector) |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2458 | drm_modeset_unlock(&mgr->base.lock); |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2459 | fail_put: |
| 2460 | drm_dp_mst_topology_put_port(port); |
| 2461 | return ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2462 | } |
| 2463 | |
Lyude Paul | 2482fce | 2022-08-17 15:38:43 -0400 | [diff] [blame] | 2464 | static int |
Lyude Paul | e2839ff | 2019-09-03 16:45:55 -0400 | [diff] [blame] | 2465 | drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch *mstb, |
| 2466 | struct drm_dp_connection_status_notify *conn_stat) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2467 | { |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2468 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2469 | struct drm_dp_mst_port *port; |
Wayne Lin | 35d3e8c | 2021-06-16 11:55:00 +0800 | [diff] [blame] | 2470 | int old_ddps, ret; |
Lyude Paul | dad7d84 | 2019-10-16 17:50:15 -0400 | [diff] [blame] | 2471 | u8 new_pdt; |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2472 | bool new_mcs; |
Lyude Paul | dad7d84 | 2019-10-16 17:50:15 -0400 | [diff] [blame] | 2473 | bool dowork = false, create_connector = false; |
Lyude Paul | c485e2c | 2019-03-13 13:51:41 -0400 | [diff] [blame] | 2474 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2475 | port = drm_dp_get_port(mstb, conn_stat->port_number); |
| 2476 | if (!port) |
Lyude Paul | 2482fce | 2022-08-17 15:38:43 -0400 | [diff] [blame] | 2477 | return 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2478 | |
Lyude Paul | dad7d84 | 2019-10-16 17:50:15 -0400 | [diff] [blame] | 2479 | if (port->connector) { |
| 2480 | if (!port->input && conn_stat->input_port) { |
| 2481 | /* |
| 2482 | * We can't remove a connector from an already exposed |
| 2483 | * port, so just throw the port out and make sure we |
| 2484 | * reprobe the link address of it's parent MSTB |
| 2485 | */ |
| 2486 | drm_dp_mst_topology_unlink_port(mgr, port); |
| 2487 | mstb->link_address_sent = false; |
| 2488 | dowork = true; |
| 2489 | goto out; |
| 2490 | } |
| 2491 | |
| 2492 | /* Locking is only needed if the port's exposed to userspace */ |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2493 | drm_modeset_lock(&mgr->base.lock, NULL); |
Lyude Paul | dad7d84 | 2019-10-16 17:50:15 -0400 | [diff] [blame] | 2494 | } else if (port->input && !conn_stat->input_port) { |
| 2495 | create_connector = true; |
| 2496 | /* Reprobe link address so we get num_sdp_streams */ |
| 2497 | mstb->link_address_sent = false; |
| 2498 | dowork = true; |
| 2499 | } |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2500 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2501 | old_ddps = port->ddps; |
Lyude Paul | dad7d84 | 2019-10-16 17:50:15 -0400 | [diff] [blame] | 2502 | port->input = conn_stat->input_port; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2503 | port->ldps = conn_stat->legacy_device_plug_status; |
| 2504 | port->ddps = conn_stat->displayport_device_plug_status; |
| 2505 | |
| 2506 | if (old_ddps != port->ddps) { |
Lyude Paul | 87212b5 | 2020-03-06 18:46:21 -0500 | [diff] [blame] | 2507 | if (port->ddps && !port->input) |
| 2508 | drm_dp_send_enum_path_resources(mgr, mstb, port); |
| 2509 | else |
Lyude Paul | fcf4638 | 2020-03-06 18:46:20 -0500 | [diff] [blame] | 2510 | port->full_pbn = 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2511 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2512 | |
Lyude Paul | dad7d84 | 2019-10-16 17:50:15 -0400 | [diff] [blame] | 2513 | new_pdt = port->input ? DP_PEER_DEVICE_NONE : conn_stat->peer_device_type; |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 2514 | new_mcs = conn_stat->message_capability_status; |
| 2515 | ret = drm_dp_port_set_pdt(port, new_pdt, new_mcs); |
Lyude Paul | dad7d84 | 2019-10-16 17:50:15 -0400 | [diff] [blame] | 2516 | if (ret == 1) { |
| 2517 | dowork = true; |
| 2518 | } else if (ret < 0) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2519 | drm_err(mgr->dev, "Failed to change PDT for port %p: %d\n", port, ret); |
Lyude Paul | dad7d84 | 2019-10-16 17:50:15 -0400 | [diff] [blame] | 2520 | dowork = false; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2521 | } |
| 2522 | |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2523 | if (port->connector) |
| 2524 | drm_modeset_unlock(&mgr->base.lock); |
Lyude Paul | dad7d84 | 2019-10-16 17:50:15 -0400 | [diff] [blame] | 2525 | else if (create_connector) |
| 2526 | drm_dp_mst_port_add_connector(mstb, port); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2527 | |
Lyude Paul | dad7d84 | 2019-10-16 17:50:15 -0400 | [diff] [blame] | 2528 | out: |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 2529 | drm_dp_mst_topology_put_port(port); |
Lyude Paul | 2482fce | 2022-08-17 15:38:43 -0400 | [diff] [blame] | 2530 | return dowork; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2531 | } |
| 2532 | |
| 2533 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, |
| 2534 | u8 lct, u8 *rad) |
| 2535 | { |
| 2536 | struct drm_dp_mst_branch *mstb; |
| 2537 | struct drm_dp_mst_port *port; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 2538 | int i, ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2539 | /* find the port by iterating down */ |
Dave Airlie | 9eb1e57 | 2015-06-22 14:40:44 +1000 | [diff] [blame] | 2540 | |
| 2541 | mutex_lock(&mgr->lock); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2542 | mstb = mgr->mst_primary; |
| 2543 | |
Stanislav Lisovskiy | 23d8003 | 2018-11-09 11:00:12 +0200 | [diff] [blame] | 2544 | if (!mstb) |
| 2545 | goto out; |
| 2546 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2547 | for (i = 0; i < lct - 1; i++) { |
| 2548 | int shift = (i % 2) ? 0 : 4; |
Mykola Lysenko | 7a11a33 | 2015-12-25 16:14:48 +0800 | [diff] [blame] | 2549 | int port_num = (rad[i / 2] >> shift) & 0xf; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2550 | |
| 2551 | list_for_each_entry(port, &mstb->ports, next) { |
| 2552 | if (port->port_num == port_num) { |
Adam Richter | 30730c7 | 2015-10-16 03:33:02 -0700 | [diff] [blame] | 2553 | mstb = port->mstb; |
| 2554 | if (!mstb) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2555 | drm_err(mgr->dev, |
| 2556 | "failed to lookup MSTB with lct %d, rad %02x\n", |
| 2557 | lct, rad[0]); |
Adam Richter | 30730c7 | 2015-10-16 03:33:02 -0700 | [diff] [blame] | 2558 | goto out; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2559 | } |
| 2560 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2561 | break; |
| 2562 | } |
| 2563 | } |
| 2564 | } |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 2565 | ret = drm_dp_mst_topology_try_get_mstb(mstb); |
| 2566 | if (!ret) |
| 2567 | mstb = NULL; |
Adam Richter | 30730c7 | 2015-10-16 03:33:02 -0700 | [diff] [blame] | 2568 | out: |
Dave Airlie | 9eb1e57 | 2015-06-22 14:40:44 +1000 | [diff] [blame] | 2569 | mutex_unlock(&mgr->lock); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2570 | return mstb; |
| 2571 | } |
| 2572 | |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2573 | static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( |
| 2574 | struct drm_dp_mst_branch *mstb, |
Lyude Paul | fde61a7 | 2019-09-03 16:45:49 -0400 | [diff] [blame] | 2575 | const uint8_t *guid) |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2576 | { |
| 2577 | struct drm_dp_mst_branch *found_mstb; |
| 2578 | struct drm_dp_mst_port *port; |
| 2579 | |
Lukasz Majczak | 3d887d5 | 2023-09-22 08:34:10 +0200 | [diff] [blame] | 2580 | if (!mstb) |
| 2581 | return NULL; |
| 2582 | |
Hersen Wu | 5e93b82 | 2016-01-22 17:07:28 -0500 | [diff] [blame] | 2583 | if (memcmp(mstb->guid, guid, 16) == 0) |
| 2584 | return mstb; |
| 2585 | |
| 2586 | |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2587 | list_for_each_entry(port, &mstb->ports, next) { |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2588 | found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); |
| 2589 | |
| 2590 | if (found_mstb) |
| 2591 | return found_mstb; |
| 2592 | } |
| 2593 | |
| 2594 | return NULL; |
| 2595 | } |
| 2596 | |
Lyude Paul | de6d681 | 2019-01-10 19:53:25 -0500 | [diff] [blame] | 2597 | static struct drm_dp_mst_branch * |
| 2598 | drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr, |
Lyude Paul | fde61a7 | 2019-09-03 16:45:49 -0400 | [diff] [blame] | 2599 | const uint8_t *guid) |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2600 | { |
| 2601 | struct drm_dp_mst_branch *mstb; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 2602 | int ret; |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2603 | |
| 2604 | /* find the port by iterating down */ |
| 2605 | mutex_lock(&mgr->lock); |
| 2606 | |
Hersen Wu | 5e93b82 | 2016-01-22 17:07:28 -0500 | [diff] [blame] | 2607 | mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 2608 | if (mstb) { |
| 2609 | ret = drm_dp_mst_topology_try_get_mstb(mstb); |
| 2610 | if (!ret) |
| 2611 | mstb = NULL; |
| 2612 | } |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2613 | |
| 2614 | mutex_unlock(&mgr->lock); |
| 2615 | return mstb; |
| 2616 | } |
| 2617 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2618 | static int drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2619 | struct drm_dp_mst_branch *mstb) |
| 2620 | { |
| 2621 | struct drm_dp_mst_port *port; |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2622 | int ret; |
| 2623 | bool changed = false; |
Lyude Paul | 14692a3 | 2019-10-16 16:02:59 -0400 | [diff] [blame] | 2624 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2625 | if (!mstb->link_address_sent) { |
| 2626 | ret = drm_dp_send_link_address(mgr, mstb); |
| 2627 | if (ret == 1) |
| 2628 | changed = true; |
| 2629 | else if (ret < 0) |
| 2630 | return ret; |
| 2631 | } |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 2632 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2633 | list_for_each_entry(port, &mstb->ports, next) { |
Lyude Paul | e21c3ad | 2022-06-02 16:17:55 -0400 | [diff] [blame] | 2634 | if (port->input || !port->ddps || !port->mstb) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2635 | continue; |
| 2636 | |
Lyude Paul | e21c3ad | 2022-06-02 16:17:55 -0400 | [diff] [blame] | 2637 | ret = drm_dp_check_and_send_link_address(mgr, port->mstb); |
| 2638 | if (ret == 1) |
| 2639 | changed = true; |
| 2640 | else if (ret < 0) |
| 2641 | return ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2642 | } |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2643 | |
| 2644 | return changed; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2645 | } |
| 2646 | |
| 2647 | static void drm_dp_mst_link_probe_work(struct work_struct *work) |
| 2648 | { |
Lyude Paul | 14692a3 | 2019-10-16 16:02:59 -0400 | [diff] [blame] | 2649 | struct drm_dp_mst_topology_mgr *mgr = |
| 2650 | container_of(work, struct drm_dp_mst_topology_mgr, work); |
| 2651 | struct drm_device *dev = mgr->dev; |
Daniel Vetter | 9254ec4 | 2015-06-22 17:31:59 +1000 | [diff] [blame] | 2652 | struct drm_dp_mst_branch *mstb; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 2653 | int ret; |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 2654 | bool clear_payload_id_table; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2655 | |
Lyude Paul | 14692a3 | 2019-10-16 16:02:59 -0400 | [diff] [blame] | 2656 | mutex_lock(&mgr->probe_lock); |
| 2657 | |
Daniel Vetter | 9254ec4 | 2015-06-22 17:31:59 +1000 | [diff] [blame] | 2658 | mutex_lock(&mgr->lock); |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 2659 | clear_payload_id_table = !mgr->payload_id_table_cleared; |
| 2660 | mgr->payload_id_table_cleared = true; |
| 2661 | |
Daniel Vetter | 9254ec4 | 2015-06-22 17:31:59 +1000 | [diff] [blame] | 2662 | mstb = mgr->mst_primary; |
| 2663 | if (mstb) { |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 2664 | ret = drm_dp_mst_topology_try_get_mstb(mstb); |
| 2665 | if (!ret) |
| 2666 | mstb = NULL; |
Daniel Vetter | 9254ec4 | 2015-06-22 17:31:59 +1000 | [diff] [blame] | 2667 | } |
| 2668 | mutex_unlock(&mgr->lock); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2669 | if (!mstb) { |
| 2670 | mutex_unlock(&mgr->probe_lock); |
| 2671 | return; |
Daniel Vetter | 9254ec4 | 2015-06-22 17:31:59 +1000 | [diff] [blame] | 2672 | } |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2673 | |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 2674 | /* |
| 2675 | * Certain branch devices seem to incorrectly report an available_pbn |
| 2676 | * of 0 on downstream sinks, even after clearing the |
| 2677 | * DP_PAYLOAD_ALLOCATE_* registers in |
| 2678 | * drm_dp_mst_topology_mgr_set_mst(). Namely, the CableMatters USB-C |
| 2679 | * 2x DP hub. Sending a CLEAR_PAYLOAD_ID_TABLE message seems to make |
| 2680 | * things work again. |
| 2681 | */ |
| 2682 | if (clear_payload_id_table) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2683 | drm_dbg_kms(dev, "Clearing payload ID table\n"); |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 2684 | drm_dp_send_clear_payload_id_table(mgr, mstb); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2685 | } |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 2686 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2687 | ret = drm_dp_check_and_send_link_address(mgr, mstb); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 2688 | drm_dp_mst_topology_put_mstb(mstb); |
| 2689 | |
Lyude Paul | 14692a3 | 2019-10-16 16:02:59 -0400 | [diff] [blame] | 2690 | mutex_unlock(&mgr->probe_lock); |
Xiaogang Chen | dc25e37 | 2021-01-12 06:36:52 +0000 | [diff] [blame] | 2691 | if (ret > 0) |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2692 | drm_kms_helper_hotplug_event(dev); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2693 | } |
| 2694 | |
| 2695 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
| 2696 | u8 *guid) |
| 2697 | { |
Ville Syrjälä | e38e128 | 2017-07-12 18:52:54 +0300 | [diff] [blame] | 2698 | u64 salt; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2699 | |
Ville Syrjälä | e38e128 | 2017-07-12 18:52:54 +0300 | [diff] [blame] | 2700 | if (memchr_inv(guid, 0, 16)) |
| 2701 | return true; |
| 2702 | |
| 2703 | salt = get_jiffies_64(); |
| 2704 | |
| 2705 | memcpy(&guid[0], &salt, sizeof(u64)); |
| 2706 | memcpy(&guid[8], &salt, sizeof(u64)); |
| 2707 | |
| 2708 | return false; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2709 | } |
| 2710 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2711 | static void build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, |
| 2712 | u8 port_num, u32 offset, u8 num_bytes) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2713 | { |
| 2714 | struct drm_dp_sideband_msg_req_body req; |
| 2715 | |
| 2716 | req.req_type = DP_REMOTE_DPCD_READ; |
| 2717 | req.u.dpcd_read.port_number = port_num; |
| 2718 | req.u.dpcd_read.dpcd_address = offset; |
| 2719 | req.u.dpcd_read.num_bytes = num_bytes; |
| 2720 | drm_dp_encode_sideband_req(&req, msg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2721 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2722 | |
| 2723 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, |
| 2724 | bool up, u8 *msg, int len) |
| 2725 | { |
| 2726 | int ret; |
| 2727 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; |
| 2728 | int tosend, total, offset; |
| 2729 | int retries = 0; |
| 2730 | |
| 2731 | retry: |
| 2732 | total = len; |
| 2733 | offset = 0; |
| 2734 | do { |
| 2735 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); |
| 2736 | |
| 2737 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, |
| 2738 | &msg[offset], |
| 2739 | tosend); |
| 2740 | if (ret != tosend) { |
| 2741 | if (ret == -EIO && retries < 5) { |
| 2742 | retries++; |
| 2743 | goto retry; |
| 2744 | } |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2745 | drm_dbg_kms(mgr->dev, "failed to dpcd write %d %d\n", tosend, ret); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2746 | |
| 2747 | return -EIO; |
| 2748 | } |
| 2749 | offset += tosend; |
| 2750 | total -= tosend; |
| 2751 | } while (total > 0); |
| 2752 | return 0; |
| 2753 | } |
| 2754 | |
| 2755 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, |
| 2756 | struct drm_dp_sideband_msg_tx *txmsg) |
| 2757 | { |
| 2758 | struct drm_dp_mst_branch *mstb = txmsg->dst; |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2759 | u8 req_type; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2760 | |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2761 | req_type = txmsg->msg[0] & 0x7f; |
| 2762 | if (req_type == DP_CONNECTION_STATUS_NOTIFY || |
Wayne Lin | d919d3d | 2021-02-24 18:15:21 +0800 | [diff] [blame] | 2763 | req_type == DP_RESOURCE_STATUS_NOTIFY || |
| 2764 | req_type == DP_CLEAR_PAYLOAD_ID_TABLE) |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2765 | hdr->broadcast = 1; |
| 2766 | else |
| 2767 | hdr->broadcast = 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2768 | hdr->path_msg = txmsg->path_msg; |
Wayne Lin | 419e91e | 2021-02-24 18:15:20 +0800 | [diff] [blame] | 2769 | if (hdr->broadcast) { |
| 2770 | hdr->lct = 1; |
| 2771 | hdr->lcr = 6; |
| 2772 | } else { |
| 2773 | hdr->lct = mstb->lct; |
| 2774 | hdr->lcr = mstb->lct - 1; |
| 2775 | } |
| 2776 | |
| 2777 | memcpy(hdr->rad, mstb->rad, hdr->lct / 2); |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 2778 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2779 | return 0; |
| 2780 | } |
| 2781 | /* |
| 2782 | * process a single block of the next message in the sideband queue |
| 2783 | */ |
| 2784 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
| 2785 | struct drm_dp_sideband_msg_tx *txmsg, |
| 2786 | bool up) |
| 2787 | { |
| 2788 | u8 chunk[48]; |
| 2789 | struct drm_dp_sideband_msg_hdr hdr; |
| 2790 | int len, space, idx, tosend; |
| 2791 | int ret; |
| 2792 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 2793 | if (txmsg->state == DRM_DP_SIDEBAND_TX_SENT) |
| 2794 | return 0; |
| 2795 | |
Damien Lespiau | bf3719c | 2014-07-14 12:13:18 +0100 | [diff] [blame] | 2796 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
| 2797 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 2798 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2799 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2800 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 2801 | /* make hdr from dst mst */ |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2802 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); |
| 2803 | if (ret < 0) |
| 2804 | return ret; |
| 2805 | |
| 2806 | /* amount left to send in this message */ |
| 2807 | len = txmsg->cur_len - txmsg->cur_offset; |
| 2808 | |
| 2809 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ |
| 2810 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); |
| 2811 | |
| 2812 | tosend = min(len, space); |
| 2813 | if (len == txmsg->cur_len) |
| 2814 | hdr.somt = 1; |
| 2815 | if (space >= len) |
| 2816 | hdr.eomt = 1; |
| 2817 | |
| 2818 | |
| 2819 | hdr.msg_len = tosend + 1; |
| 2820 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); |
| 2821 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); |
| 2822 | /* add crc at end */ |
| 2823 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); |
| 2824 | idx += tosend + 1; |
| 2825 | |
| 2826 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); |
Rajkumar Subbiah | 92bd92c | 2021-07-06 08:30:34 -0700 | [diff] [blame] | 2827 | if (ret) { |
| 2828 | if (drm_debug_enabled(DRM_UT_DP)) { |
Jani Nikula | 6470aac | 2024-01-16 15:07:29 +0200 | [diff] [blame] | 2829 | struct drm_printer p = drm_dbg_printer(mgr->dev, |
| 2830 | DRM_UT_DP, |
| 2831 | DBG_PREFIX); |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 2832 | |
Rajkumar Subbiah | 92bd92c | 2021-07-06 08:30:34 -0700 | [diff] [blame] | 2833 | drm_printf(&p, "sideband msg failed to send\n"); |
| 2834 | drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); |
| 2835 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2836 | return ret; |
| 2837 | } |
| 2838 | |
| 2839 | txmsg->cur_offset += tosend; |
| 2840 | if (txmsg->cur_offset == txmsg->cur_len) { |
| 2841 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT; |
| 2842 | return 1; |
| 2843 | } |
| 2844 | return 0; |
| 2845 | } |
| 2846 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2847 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
| 2848 | { |
| 2849 | struct drm_dp_sideband_msg_tx *txmsg; |
| 2850 | int ret; |
| 2851 | |
Daniel Vetter | cd961bb | 2015-01-28 10:02:23 +0100 | [diff] [blame] | 2852 | WARN_ON(!mutex_is_locked(&mgr->qlock)); |
| 2853 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2854 | /* construct a chunk from the first msg in the tx_msg queue */ |
Daniel Vetter | cb021a3 | 2016-07-15 21:48:03 +0200 | [diff] [blame] | 2855 | if (list_empty(&mgr->tx_msg_downq)) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2856 | return; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2857 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 2858 | txmsg = list_first_entry(&mgr->tx_msg_downq, |
| 2859 | struct drm_dp_sideband_msg_tx, next); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2860 | ret = process_single_tx_qlock(mgr, txmsg, false); |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 2861 | if (ret < 0) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2862 | drm_dbg_kms(mgr->dev, "failed to send msg in q %d\n", ret); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2863 | list_del(&txmsg->next); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2864 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
Chris Wilson | 68e989d | 2017-05-13 11:52:01 +0100 | [diff] [blame] | 2865 | wake_up_all(&mgr->tx_waitq); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2866 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2867 | } |
| 2868 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2869 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, |
| 2870 | struct drm_dp_sideband_msg_tx *txmsg) |
| 2871 | { |
| 2872 | mutex_lock(&mgr->qlock); |
| 2873 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 2874 | |
Jani Nikula | f0a8f53 | 2019-10-01 17:06:14 +0300 | [diff] [blame] | 2875 | if (drm_debug_enabled(DRM_UT_DP)) { |
Jani Nikula | 6470aac | 2024-01-16 15:07:29 +0200 | [diff] [blame] | 2876 | struct drm_printer p = drm_dbg_printer(mgr->dev, DRM_UT_DP, |
| 2877 | DBG_PREFIX); |
Lyude Paul | 2f015ec | 2019-09-03 16:45:45 -0400 | [diff] [blame] | 2878 | |
| 2879 | drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); |
| 2880 | } |
| 2881 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 2882 | if (list_is_singular(&mgr->tx_msg_downq)) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2883 | process_single_down_tx_qlock(mgr); |
| 2884 | mutex_unlock(&mgr->qlock); |
| 2885 | } |
| 2886 | |
Lyude Paul | 5950f0b | 2019-09-03 16:45:39 -0400 | [diff] [blame] | 2887 | static void |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2888 | drm_dp_dump_link_address(const struct drm_dp_mst_topology_mgr *mgr, |
| 2889 | struct drm_dp_link_address_ack_reply *reply) |
Lyude Paul | 5950f0b | 2019-09-03 16:45:39 -0400 | [diff] [blame] | 2890 | { |
| 2891 | struct drm_dp_link_addr_reply_port *port_reply; |
| 2892 | int i; |
| 2893 | |
| 2894 | for (i = 0; i < reply->nports; i++) { |
| 2895 | port_reply = &reply->ports[i]; |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2896 | drm_dbg_kms(mgr->dev, |
| 2897 | "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", |
| 2898 | i, |
| 2899 | port_reply->input_port, |
| 2900 | port_reply->peer_device_type, |
| 2901 | port_reply->port_number, |
| 2902 | port_reply->dpcd_revision, |
| 2903 | port_reply->mcs, |
| 2904 | port_reply->ddps, |
| 2905 | port_reply->legacy_device_plug_status, |
| 2906 | port_reply->num_sdp_streams, |
| 2907 | port_reply->num_sdp_stream_sinks); |
Lyude Paul | 5950f0b | 2019-09-03 16:45:39 -0400 | [diff] [blame] | 2908 | } |
| 2909 | } |
| 2910 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2911 | static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 2912 | struct drm_dp_mst_branch *mstb) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2913 | { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2914 | struct drm_dp_sideband_msg_tx *txmsg; |
Lyude Paul | 37dfdc5 | 2019-09-03 16:45:53 -0400 | [diff] [blame] | 2915 | struct drm_dp_link_address_ack_reply *reply; |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2916 | struct drm_dp_mst_port *port, *tmp; |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2917 | int i, ret, port_mask = 0; |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2918 | bool changed = false; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2919 | |
| 2920 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 2921 | if (!txmsg) |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2922 | return -ENOMEM; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2923 | |
| 2924 | txmsg->dst = mstb; |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2925 | build_link_address(txmsg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2926 | |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 2927 | mstb->link_address_sent = true; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2928 | drm_dp_queue_down_tx(mgr, txmsg); |
| 2929 | |
Lyude Paul | 37dfdc5 | 2019-09-03 16:45:53 -0400 | [diff] [blame] | 2930 | /* FIXME: Actually do some real error handling here */ |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2931 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
Wayne Lin | d63d810 | 2024-06-26 16:48:23 +0800 | [diff] [blame] | 2932 | if (ret < 0) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2933 | drm_err(mgr->dev, "Sending link address failed with %d\n", ret); |
Lyude Paul | 37dfdc5 | 2019-09-03 16:45:53 -0400 | [diff] [blame] | 2934 | goto out; |
| 2935 | } |
| 2936 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2937 | drm_err(mgr->dev, "link address NAK received\n"); |
Lyude Paul | 37dfdc5 | 2019-09-03 16:45:53 -0400 | [diff] [blame] | 2938 | ret = -EIO; |
| 2939 | goto out; |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 2940 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2941 | |
Lyude Paul | 37dfdc5 | 2019-09-03 16:45:53 -0400 | [diff] [blame] | 2942 | reply = &txmsg->reply.u.link_addr; |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2943 | drm_dbg_kms(mgr->dev, "link address reply: %d\n", reply->nports); |
| 2944 | drm_dp_dump_link_address(mgr, reply); |
Lyude Paul | 37dfdc5 | 2019-09-03 16:45:53 -0400 | [diff] [blame] | 2945 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2946 | ret = drm_dp_check_mstb_guid(mstb, reply->guid); |
Lyude Paul | 94b6ada | 2020-03-06 18:49:22 -0500 | [diff] [blame] | 2947 | if (ret) { |
| 2948 | char buf[64]; |
| 2949 | |
| 2950 | drm_dp_mst_rad_to_str(mstb->rad, mstb->lct, buf, sizeof(buf)); |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2951 | drm_err(mgr->dev, "GUID check on %s failed: %d\n", buf, ret); |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2952 | goto out; |
Lyude Paul | 94b6ada | 2020-03-06 18:49:22 -0500 | [diff] [blame] | 2953 | } |
Lyude Paul | 37dfdc5 | 2019-09-03 16:45:53 -0400 | [diff] [blame] | 2954 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2955 | for (i = 0; i < reply->nports; i++) { |
| 2956 | port_mask |= BIT(reply->ports[i].port_number); |
| 2957 | ret = drm_dp_mst_handle_link_address_port(mstb, mgr->dev, |
| 2958 | &reply->ports[i]); |
| 2959 | if (ret == 1) |
| 2960 | changed = true; |
| 2961 | else if (ret < 0) |
| 2962 | goto out; |
| 2963 | } |
Lyude Paul | 37dfdc5 | 2019-09-03 16:45:53 -0400 | [diff] [blame] | 2964 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2965 | /* Prune any ports that are currently a part of mstb in our in-memory |
| 2966 | * topology, but were not seen in this link address. Usually this |
| 2967 | * means that they were removed while the topology was out of sync, |
| 2968 | * e.g. during suspend/resume |
| 2969 | */ |
| 2970 | mutex_lock(&mgr->lock); |
| 2971 | list_for_each_entry_safe(port, tmp, &mstb->ports, next) { |
| 2972 | if (port_mask & BIT(port->port_num)) |
| 2973 | continue; |
| 2974 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 2975 | drm_dbg_kms(mgr->dev, "port %d was not in link address, removing\n", |
| 2976 | port->port_num); |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2977 | list_del(&port->next); |
| 2978 | drm_dp_mst_topology_put_port(port); |
| 2979 | changed = true; |
| 2980 | } |
| 2981 | mutex_unlock(&mgr->lock); |
Lyude Paul | 37dfdc5 | 2019-09-03 16:45:53 -0400 | [diff] [blame] | 2982 | |
| 2983 | out: |
Wayne Lin | d63d810 | 2024-06-26 16:48:23 +0800 | [diff] [blame] | 2984 | if (ret < 0) |
Lyude Paul | 37dfdc5 | 2019-09-03 16:45:53 -0400 | [diff] [blame] | 2985 | mstb->link_address_sent = false; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2986 | kfree(txmsg); |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 2987 | return ret < 0 ? ret : changed; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2988 | } |
| 2989 | |
Chris Wilson | a4292e5 | 2020-05-16 22:23:30 +0100 | [diff] [blame] | 2990 | static void |
| 2991 | drm_dp_send_clear_payload_id_table(struct drm_dp_mst_topology_mgr *mgr, |
| 2992 | struct drm_dp_mst_branch *mstb) |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 2993 | { |
| 2994 | struct drm_dp_sideband_msg_tx *txmsg; |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 2995 | int ret; |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 2996 | |
| 2997 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 2998 | if (!txmsg) |
| 2999 | return; |
| 3000 | |
| 3001 | txmsg->dst = mstb; |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 3002 | build_clear_payload_id_table(txmsg); |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 3003 | |
| 3004 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3005 | |
| 3006 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 3007 | if (ret > 0 && txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3008 | drm_dbg_kms(mgr->dev, "clear payload table id nak received\n"); |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 3009 | |
| 3010 | kfree(txmsg); |
| 3011 | } |
| 3012 | |
Lyude Paul | 95b0013 | 2019-09-03 16:45:47 -0400 | [diff] [blame] | 3013 | static int |
| 3014 | drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
| 3015 | struct drm_dp_mst_branch *mstb, |
| 3016 | struct drm_dp_mst_port *port) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3017 | { |
Lyude Paul | 95b0013 | 2019-09-03 16:45:47 -0400 | [diff] [blame] | 3018 | struct drm_dp_enum_path_resources_ack_reply *path_res; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3019 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3020 | int ret; |
| 3021 | |
| 3022 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 3023 | if (!txmsg) |
| 3024 | return -ENOMEM; |
| 3025 | |
| 3026 | txmsg->dst = mstb; |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 3027 | build_enum_path_resources(txmsg, port->port_num); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3028 | |
| 3029 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3030 | |
| 3031 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 3032 | if (ret > 0) { |
Lyude Paul | 87212b5 | 2020-03-06 18:46:21 -0500 | [diff] [blame] | 3033 | ret = 0; |
Lyude Paul | 95b0013 | 2019-09-03 16:45:47 -0400 | [diff] [blame] | 3034 | path_res = &txmsg->reply.u.path_resources; |
| 3035 | |
Ville Syrjälä | 45bbda1 | 2019-01-22 22:03:00 +0200 | [diff] [blame] | 3036 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3037 | drm_dbg_kms(mgr->dev, "enum path resources nak received\n"); |
Ville Syrjälä | 45bbda1 | 2019-01-22 22:03:00 +0200 | [diff] [blame] | 3038 | } else { |
Lyude Paul | 95b0013 | 2019-09-03 16:45:47 -0400 | [diff] [blame] | 3039 | if (port->port_num != path_res->port_number) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3040 | DRM_ERROR("got incorrect port in response\n"); |
Lyude Paul | 95b0013 | 2019-09-03 16:45:47 -0400 | [diff] [blame] | 3041 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3042 | drm_dbg_kms(mgr->dev, "enum path resources %d: %d %d\n", |
| 3043 | path_res->port_number, |
| 3044 | path_res->full_payload_bw_number, |
| 3045 | path_res->avail_payload_bw_number); |
Lyude Paul | 87212b5 | 2020-03-06 18:46:21 -0500 | [diff] [blame] | 3046 | |
| 3047 | /* |
| 3048 | * If something changed, make sure we send a |
| 3049 | * hotplug |
| 3050 | */ |
| 3051 | if (port->full_pbn != path_res->full_payload_bw_number || |
| 3052 | port->fec_capable != path_res->fec_capable) |
| 3053 | ret = 1; |
| 3054 | |
Lyude Paul | fcf4638 | 2020-03-06 18:46:20 -0500 | [diff] [blame] | 3055 | port->full_pbn = path_res->full_payload_bw_number; |
David Francis | a3c2b0f | 2019-06-06 11:20:10 -0400 | [diff] [blame] | 3056 | port->fec_capable = path_res->fec_capable; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3057 | } |
| 3058 | } |
| 3059 | |
| 3060 | kfree(txmsg); |
Lyude Paul | 87212b5 | 2020-03-06 18:46:21 -0500 | [diff] [blame] | 3061 | return ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3062 | } |
| 3063 | |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 3064 | static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) |
| 3065 | { |
| 3066 | if (!mstb->port_parent) |
| 3067 | return NULL; |
| 3068 | |
| 3069 | if (mstb->port_parent->mstb != mstb) |
| 3070 | return mstb->port_parent; |
| 3071 | |
| 3072 | return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); |
| 3073 | } |
| 3074 | |
Lyude Paul | 56d1c14 | 2019-01-10 19:53:30 -0500 | [diff] [blame] | 3075 | /* |
| 3076 | * Searches upwards in the topology starting from mstb to try to find the |
| 3077 | * closest available parent of mstb that's still connected to the rest of the |
| 3078 | * topology. This can be used in order to perform operations like releasing |
| 3079 | * payloads, where the branch device which owned the payload may no longer be |
| 3080 | * around and thus would require that the payload on the last living relative |
| 3081 | * be freed instead. |
| 3082 | */ |
| 3083 | static struct drm_dp_mst_branch * |
| 3084 | drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, |
| 3085 | struct drm_dp_mst_branch *mstb, |
| 3086 | int *port_num) |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 3087 | { |
| 3088 | struct drm_dp_mst_branch *rmstb = NULL; |
| 3089 | struct drm_dp_mst_port *found_port; |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 3090 | |
Lyude Paul | 56d1c14 | 2019-01-10 19:53:30 -0500 | [diff] [blame] | 3091 | mutex_lock(&mgr->lock); |
| 3092 | if (!mgr->mst_primary) |
| 3093 | goto out; |
| 3094 | |
| 3095 | do { |
| 3096 | found_port = drm_dp_get_last_connected_port_to_mstb(mstb); |
| 3097 | if (!found_port) |
| 3098 | break; |
| 3099 | |
| 3100 | if (drm_dp_mst_topology_try_get_mstb(found_port->parent)) { |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 3101 | rmstb = found_port->parent; |
Lyude Paul | 56d1c14 | 2019-01-10 19:53:30 -0500 | [diff] [blame] | 3102 | *port_num = found_port->port_num; |
| 3103 | } else { |
| 3104 | /* Search again, starting from this parent */ |
| 3105 | mstb = found_port->parent; |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 3106 | } |
Lyude Paul | 56d1c14 | 2019-01-10 19:53:30 -0500 | [diff] [blame] | 3107 | } while (!rmstb); |
| 3108 | out: |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 3109 | mutex_unlock(&mgr->lock); |
| 3110 | return rmstb; |
| 3111 | } |
| 3112 | |
Thierry Reding | 8fa6a42 | 2014-07-21 13:23:57 +0200 | [diff] [blame] | 3113 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
| 3114 | struct drm_dp_mst_port *port, |
| 3115 | int id, |
| 3116 | int pbn) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3117 | { |
| 3118 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3119 | struct drm_dp_mst_branch *mstb; |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 3120 | int ret, port_num; |
Libin Yang | ef8f9be | 2015-12-02 14:09:43 +0800 | [diff] [blame] | 3121 | u8 sinks[DRM_DP_MAX_SDP_STREAMS]; |
| 3122 | int i; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3123 | |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 3124 | port_num = port->port_num; |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 3125 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 3126 | if (!mstb) { |
Lyude Paul | de6d681 | 2019-01-10 19:53:25 -0500 | [diff] [blame] | 3127 | mstb = drm_dp_get_last_connected_port_and_mstb(mgr, |
| 3128 | port->parent, |
| 3129 | &port_num); |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 3130 | |
Lyude Paul | cfe9f90 | 2019-01-10 19:53:32 -0500 | [diff] [blame] | 3131 | if (!mstb) |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 3132 | return -EINVAL; |
| 3133 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3134 | |
| 3135 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 3136 | if (!txmsg) { |
| 3137 | ret = -ENOMEM; |
| 3138 | goto fail_put; |
| 3139 | } |
| 3140 | |
Libin Yang | ef8f9be | 2015-12-02 14:09:43 +0800 | [diff] [blame] | 3141 | for (i = 0; i < port->num_sdp_streams; i++) |
| 3142 | sinks[i] = i; |
| 3143 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3144 | txmsg->dst = mstb; |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 3145 | build_allocate_payload(txmsg, port_num, |
| 3146 | id, |
| 3147 | pbn, port->num_sdp_streams, sinks); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3148 | |
| 3149 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3150 | |
Lyude Paul | 56d1c14 | 2019-01-10 19:53:30 -0500 | [diff] [blame] | 3151 | /* |
| 3152 | * FIXME: there is a small chance that between getting the last |
| 3153 | * connected mstb and sending the payload message, the last connected |
| 3154 | * mstb could also be removed from the topology. In the future, this |
| 3155 | * needs to be fixed by restarting the |
| 3156 | * drm_dp_get_last_connected_port_and_mstb() search in the event of a |
| 3157 | * timeout if the topology is still connected to the system. |
| 3158 | */ |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3159 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 3160 | if (ret > 0) { |
Ville Syrjälä | 45bbda1 | 2019-01-22 22:03:00 +0200 | [diff] [blame] | 3161 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3162 | ret = -EINVAL; |
Lyude Paul | de6d681 | 2019-01-10 19:53:25 -0500 | [diff] [blame] | 3163 | else |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3164 | ret = 0; |
| 3165 | } |
| 3166 | kfree(txmsg); |
| 3167 | fail_put: |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 3168 | drm_dp_mst_topology_put_mstb(mstb); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3169 | return ret; |
| 3170 | } |
| 3171 | |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 3172 | int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, |
| 3173 | struct drm_dp_mst_port *port, bool power_up) |
| 3174 | { |
| 3175 | struct drm_dp_sideband_msg_tx *txmsg; |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 3176 | int ret; |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 3177 | |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 3178 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 3179 | if (!port) |
| 3180 | return -EINVAL; |
| 3181 | |
| 3182 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 3183 | if (!txmsg) { |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 3184 | drm_dp_mst_topology_put_port(port); |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 3185 | return -ENOMEM; |
| 3186 | } |
| 3187 | |
| 3188 | txmsg->dst = port->parent; |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 3189 | build_power_updown_phy(txmsg, port->port_num, power_up); |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 3190 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3191 | |
| 3192 | ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg); |
| 3193 | if (ret > 0) { |
Ville Syrjälä | 45bbda1 | 2019-01-22 22:03:00 +0200 | [diff] [blame] | 3194 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 3195 | ret = -EINVAL; |
| 3196 | else |
| 3197 | ret = 0; |
| 3198 | } |
| 3199 | kfree(txmsg); |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 3200 | drm_dp_mst_topology_put_port(port); |
Dhinakaran Pandiyan | 0bb9c2b | 2017-09-06 17:14:58 -0700 | [diff] [blame] | 3201 | |
| 3202 | return ret; |
| 3203 | } |
| 3204 | EXPORT_SYMBOL(drm_dp_send_power_updown_phy); |
| 3205 | |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 3206 | int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr, |
| 3207 | struct drm_dp_mst_port *port, |
| 3208 | struct drm_dp_query_stream_enc_status_ack_reply *status) |
| 3209 | { |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3210 | struct drm_dp_mst_topology_state *state; |
| 3211 | struct drm_dp_mst_atomic_payload *payload; |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 3212 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3213 | u8 nonce[7]; |
Lee Jones | 0e120f1 | 2020-11-16 17:40:33 +0000 | [diff] [blame] | 3214 | int ret; |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 3215 | |
| 3216 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 3217 | if (!txmsg) |
| 3218 | return -ENOMEM; |
| 3219 | |
| 3220 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
| 3221 | if (!port) { |
| 3222 | ret = -EINVAL; |
| 3223 | goto out_get_port; |
| 3224 | } |
| 3225 | |
| 3226 | get_random_bytes(nonce, sizeof(nonce)); |
| 3227 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3228 | drm_modeset_lock(&mgr->base.lock, NULL); |
| 3229 | state = to_drm_dp_mst_topology_state(mgr->base.state); |
| 3230 | payload = drm_atomic_get_mst_payload_state(state, port); |
| 3231 | |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 3232 | /* |
| 3233 | * "Source device targets the QUERY_STREAM_ENCRYPTION_STATUS message |
| 3234 | * transaction at the MST Branch device directly connected to the |
| 3235 | * Source" |
| 3236 | */ |
| 3237 | txmsg->dst = mgr->mst_primary; |
| 3238 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3239 | build_query_stream_enc_status(txmsg, payload->vcpi, nonce); |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 3240 | |
| 3241 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3242 | |
| 3243 | ret = drm_dp_mst_wait_tx_reply(mgr->mst_primary, txmsg); |
| 3244 | if (ret < 0) { |
| 3245 | goto out; |
| 3246 | } else if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
| 3247 | drm_dbg_kms(mgr->dev, "query encryption status nak received\n"); |
| 3248 | ret = -ENXIO; |
| 3249 | goto out; |
| 3250 | } |
| 3251 | |
| 3252 | ret = 0; |
| 3253 | memcpy(status, &txmsg->reply.u.enc_status, sizeof(*status)); |
| 3254 | |
| 3255 | out: |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3256 | drm_modeset_unlock(&mgr->base.lock); |
Sean Paul | e38c298 | 2020-08-19 10:31:24 -0400 | [diff] [blame] | 3257 | drm_dp_mst_topology_put_port(port); |
| 3258 | out_get_port: |
| 3259 | kfree(txmsg); |
| 3260 | return ret; |
| 3261 | } |
| 3262 | EXPORT_SYMBOL(drm_dp_send_query_stream_enc_status); |
| 3263 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3264 | static int drm_dp_create_payload_at_dfp(struct drm_dp_mst_topology_mgr *mgr, |
| 3265 | struct drm_dp_mst_atomic_payload *payload) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3266 | { |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3267 | return drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot, |
| 3268 | payload->time_slots); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3269 | } |
| 3270 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3271 | static int drm_dp_create_payload_to_remote(struct drm_dp_mst_topology_mgr *mgr, |
| 3272 | struct drm_dp_mst_atomic_payload *payload) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3273 | { |
| 3274 | int ret; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3275 | struct drm_dp_mst_port *port = drm_dp_mst_topology_get_port_validated(mgr, payload->port); |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 3276 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3277 | if (!port) |
| 3278 | return -EIO; |
| 3279 | |
| 3280 | ret = drm_dp_payload_send_msg(mgr, port, payload->vcpi, payload->pbn); |
| 3281 | drm_dp_mst_topology_put_port(port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3282 | return ret; |
| 3283 | } |
| 3284 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3285 | static void drm_dp_destroy_payload_at_remote_and_dfp(struct drm_dp_mst_topology_mgr *mgr, |
| 3286 | struct drm_dp_mst_topology_state *mst_state, |
| 3287 | struct drm_dp_mst_atomic_payload *payload) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3288 | { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3289 | drm_dbg_kms(mgr->dev, "\n"); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3290 | |
Matt Roper | 1e55a53 | 2019-02-01 17:23:26 -0800 | [diff] [blame] | 3291 | /* it's okay for these to fail */ |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3292 | if (payload->payload_allocation_status == DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE) { |
| 3293 | drm_dp_payload_send_msg(mgr, payload->port, payload->vcpi, 0); |
| 3294 | payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_DFP; |
| 3295 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3296 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3297 | if (payload->payload_allocation_status == DRM_DP_MST_PAYLOAD_ALLOCATION_DFP) |
| 3298 | drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot, 0); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3299 | } |
| 3300 | |
| 3301 | /** |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3302 | * drm_dp_add_payload_part1() - Execute payload update part 1 |
| 3303 | * @mgr: Manager to use. |
| 3304 | * @mst_state: The MST atomic state |
| 3305 | * @payload: The payload to write |
Bhawanpreet Lakha | d6c6a76 | 2021-10-25 18:38:22 -0400 | [diff] [blame] | 3306 | * |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3307 | * Determines the starting time slot for the given payload, and programs the VCPI for this payload |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3308 | * into the DPCD of DPRX. After calling this, the driver should generate ACT and payload packets. |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3309 | * |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3310 | * Returns: 0 on success, error code on failure. |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3311 | */ |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3312 | int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr, |
| 3313 | struct drm_dp_mst_topology_state *mst_state, |
| 3314 | struct drm_dp_mst_atomic_payload *payload) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3315 | { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3316 | struct drm_dp_mst_port *port; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3317 | int ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3318 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3319 | /* Update mst mgr info */ |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3320 | if (mgr->payload_count == 0) |
| 3321 | mgr->next_start_slot = mst_state->start_slot; |
Lyude Paul | cfe9f90 | 2019-01-10 19:53:32 -0500 | [diff] [blame] | 3322 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3323 | payload->vc_start_slot = mgr->next_start_slot; |
Wayne Lin | 3769e4c | 2021-06-16 11:55:01 +0800 | [diff] [blame] | 3324 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3325 | mgr->payload_count++; |
| 3326 | mgr->next_start_slot += payload->time_slots; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3327 | |
Imre Deak | 8bde444 | 2023-09-14 01:32:16 +0300 | [diff] [blame] | 3328 | payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL; |
| 3329 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3330 | /* Allocate payload to immediate downstream facing port */ |
| 3331 | port = drm_dp_mst_topology_get_port_validated(mgr, payload->port); |
| 3332 | if (!port) { |
| 3333 | drm_dbg_kms(mgr->dev, |
| 3334 | "VCPI %d for port %p not in topology, not creating a payload to remote\n", |
| 3335 | payload->vcpi, payload->port); |
Imre Deak | 8bde444 | 2023-09-14 01:32:16 +0300 | [diff] [blame] | 3336 | return -EIO; |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3337 | } |
| 3338 | |
Imre Deak | 8bde444 | 2023-09-14 01:32:16 +0300 | [diff] [blame] | 3339 | ret = drm_dp_create_payload_at_dfp(mgr, payload); |
| 3340 | if (ret < 0) { |
Imre Deak | 0663e1d | 2023-09-14 01:32:17 +0300 | [diff] [blame] | 3341 | drm_dbg_kms(mgr->dev, "Failed to create MST payload for port %p: %d\n", |
| 3342 | payload->port, ret); |
Imre Deak | 8bde444 | 2023-09-14 01:32:16 +0300 | [diff] [blame] | 3343 | goto put_port; |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3344 | } |
| 3345 | |
Imre Deak | 8bde444 | 2023-09-14 01:32:16 +0300 | [diff] [blame] | 3346 | payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_DFP; |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3347 | |
Imre Deak | 8bde444 | 2023-09-14 01:32:16 +0300 | [diff] [blame] | 3348 | put_port: |
| 3349 | drm_dp_mst_topology_put_port(port); |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3350 | |
| 3351 | return ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3352 | } |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3353 | EXPORT_SYMBOL(drm_dp_add_payload_part1); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3354 | |
| 3355 | /** |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3356 | * drm_dp_remove_payload_part1() - Remove an MST payload along the virtual channel |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3357 | * @mgr: Manager to use. |
| 3358 | * @mst_state: The MST atomic state |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3359 | * @payload: The payload to remove |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3360 | * |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3361 | * Removes a payload along the virtual channel if it was successfully allocated. |
| 3362 | * After calling this, the driver should set HW to generate ACT and then switch to new |
| 3363 | * payload allocation state. |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3364 | */ |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3365 | void drm_dp_remove_payload_part1(struct drm_dp_mst_topology_mgr *mgr, |
| 3366 | struct drm_dp_mst_topology_state *mst_state, |
| 3367 | struct drm_dp_mst_atomic_payload *payload) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3368 | { |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3369 | /* Remove remote payload allocation */ |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3370 | bool send_remove = false; |
| 3371 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3372 | mutex_lock(&mgr->lock); |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3373 | send_remove = drm_dp_mst_port_downstream_of_branch(payload->port, mgr->mst_primary); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3374 | mutex_unlock(&mgr->lock); |
| 3375 | |
| 3376 | if (send_remove) |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3377 | drm_dp_destroy_payload_at_remote_and_dfp(mgr, mst_state, payload); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3378 | else |
| 3379 | drm_dbg_kms(mgr->dev, "Payload for VCPI %d not in topology, not sending remove\n", |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3380 | payload->vcpi); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3381 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3382 | payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL; |
| 3383 | } |
| 3384 | EXPORT_SYMBOL(drm_dp_remove_payload_part1); |
| 3385 | |
| 3386 | /** |
| 3387 | * drm_dp_remove_payload_part2() - Remove an MST payload locally |
| 3388 | * @mgr: Manager to use. |
| 3389 | * @mst_state: The MST atomic state |
| 3390 | * @old_payload: The payload with its old state |
| 3391 | * @new_payload: The payload with its latest state |
| 3392 | * |
| 3393 | * Updates the starting time slots of all other payloads which would have been shifted towards |
| 3394 | * the start of the payload ID table as a result of removing a payload. Driver should call this |
| 3395 | * function whenever it removes a payload in its HW. It's independent to the result of payload |
| 3396 | * allocation/deallocation at branch devices along the virtual channel. |
| 3397 | */ |
| 3398 | void drm_dp_remove_payload_part2(struct drm_dp_mst_topology_mgr *mgr, |
| 3399 | struct drm_dp_mst_topology_state *mst_state, |
| 3400 | const struct drm_dp_mst_atomic_payload *old_payload, |
| 3401 | struct drm_dp_mst_atomic_payload *new_payload) |
| 3402 | { |
| 3403 | struct drm_dp_mst_atomic_payload *pos; |
| 3404 | |
| 3405 | /* Remove local payload allocation */ |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3406 | list_for_each_entry(pos, &mst_state->payloads, next) { |
Imre Deak | e761cc2 | 2023-02-06 13:48:54 +0200 | [diff] [blame] | 3407 | if (pos != new_payload && pos->vc_start_slot > new_payload->vc_start_slot) |
| 3408 | pos->vc_start_slot -= old_payload->time_slots; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3409 | } |
Imre Deak | e761cc2 | 2023-02-06 13:48:54 +0200 | [diff] [blame] | 3410 | new_payload->vc_start_slot = -1; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3411 | |
| 3412 | mgr->payload_count--; |
Imre Deak | e761cc2 | 2023-02-06 13:48:54 +0200 | [diff] [blame] | 3413 | mgr->next_start_slot -= old_payload->time_slots; |
Wayne Lin | 9b2d019 | 2022-12-28 14:50:43 +0800 | [diff] [blame] | 3414 | |
Imre Deak | e761cc2 | 2023-02-06 13:48:54 +0200 | [diff] [blame] | 3415 | if (new_payload->delete) |
| 3416 | drm_dp_mst_put_port_malloc(new_payload->port); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3417 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3418 | new_payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_NONE; |
| 3419 | } |
| 3420 | EXPORT_SYMBOL(drm_dp_remove_payload_part2); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3421 | /** |
| 3422 | * drm_dp_add_payload_part2() - Execute payload update part 2 |
| 3423 | * @mgr: Manager to use. |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3424 | * @payload: The payload to update |
| 3425 | * |
| 3426 | * If @payload was successfully assigned a starting time slot by drm_dp_add_payload_part1(), this |
| 3427 | * function will send the sideband messages to finish allocating this payload. |
| 3428 | * |
| 3429 | * Returns: 0 on success, negative error code on failure. |
| 3430 | */ |
| 3431 | int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr, |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3432 | struct drm_dp_mst_atomic_payload *payload) |
| 3433 | { |
Damien Lespiau | 7389ad4 | 2014-07-14 11:53:44 +0100 | [diff] [blame] | 3434 | int ret = 0; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 3435 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3436 | /* Skip failed payloads */ |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3437 | if (payload->payload_allocation_status != DRM_DP_MST_PAYLOAD_ALLOCATION_DFP) { |
Wayne Lin | 8a0a7b9 | 2024-03-07 14:29:57 +0800 | [diff] [blame] | 3438 | drm_dbg_kms(mgr->dev, "Part 1 of payload creation for %s failed, skipping part 2\n", |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3439 | payload->port->connector->name); |
| 3440 | return -EIO; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3441 | } |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3442 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3443 | /* Allocate payload to remote end */ |
| 3444 | ret = drm_dp_create_payload_to_remote(mgr, payload); |
| 3445 | if (ret < 0) |
Wayne Lin | ae4d231 | 2023-08-07 10:56:37 +0800 | [diff] [blame] | 3446 | drm_err(mgr->dev, "Step 2 of creating MST payload for %p failed: %d\n", |
| 3447 | payload->port, ret); |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 3448 | else |
| 3449 | payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3450 | |
| 3451 | return ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3452 | } |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3453 | EXPORT_SYMBOL(drm_dp_add_payload_part2); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3454 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3455 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
| 3456 | struct drm_dp_mst_port *port, |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 3457 | int offset, int size, u8 *bytes) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3458 | { |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 3459 | int ret = 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3460 | struct drm_dp_sideband_msg_tx *txmsg; |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 3461 | struct drm_dp_mst_branch *mstb; |
| 3462 | |
| 3463 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
| 3464 | if (!mstb) |
| 3465 | return -EINVAL; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3466 | |
| 3467 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 3468 | if (!txmsg) { |
| 3469 | ret = -ENOMEM; |
| 3470 | goto fail_put; |
| 3471 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3472 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 3473 | build_dpcd_read(txmsg, port->port_num, offset, size); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3474 | txmsg->dst = port->parent; |
| 3475 | |
| 3476 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3477 | |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 3478 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 3479 | if (ret < 0) |
| 3480 | goto fail_free; |
| 3481 | |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 3482 | if (txmsg->reply.reply_type == 1) { |
Wayne Lin | 1e6b8d5 | 2022-04-28 20:49:44 +0800 | [diff] [blame] | 3483 | drm_dbg_kms(mgr->dev, "mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n", |
| 3484 | mstb, port->port_num, offset, size); |
Ville Syrjälä | 562836a2 | 2019-07-23 19:28:01 -0400 | [diff] [blame] | 3485 | ret = -EIO; |
| 3486 | goto fail_free; |
| 3487 | } |
| 3488 | |
| 3489 | if (txmsg->reply.u.remote_dpcd_read_ack.num_bytes != size) { |
| 3490 | ret = -EPROTO; |
| 3491 | goto fail_free; |
| 3492 | } |
| 3493 | |
| 3494 | ret = min_t(size_t, txmsg->reply.u.remote_dpcd_read_ack.num_bytes, |
| 3495 | size); |
| 3496 | memcpy(bytes, txmsg->reply.u.remote_dpcd_read_ack.bytes, ret); |
| 3497 | |
| 3498 | fail_free: |
| 3499 | kfree(txmsg); |
| 3500 | fail_put: |
| 3501 | drm_dp_mst_topology_put_mstb(mstb); |
| 3502 | |
| 3503 | return ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3504 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3505 | |
| 3506 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
| 3507 | struct drm_dp_mst_port *port, |
| 3508 | int offset, int size, u8 *bytes) |
| 3509 | { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3510 | int ret; |
| 3511 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3512 | struct drm_dp_mst_branch *mstb; |
| 3513 | |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 3514 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3515 | if (!mstb) |
| 3516 | return -EINVAL; |
| 3517 | |
| 3518 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 3519 | if (!txmsg) { |
| 3520 | ret = -ENOMEM; |
| 3521 | goto fail_put; |
| 3522 | } |
| 3523 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 3524 | build_dpcd_write(txmsg, port->port_num, offset, size, bytes); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3525 | txmsg->dst = mstb; |
| 3526 | |
| 3527 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3528 | |
| 3529 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
Lyude Paul | dbc05ae | 2020-04-24 15:07:22 -0400 | [diff] [blame] | 3530 | if (ret > 0) { |
| 3531 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) |
| 3532 | ret = -EIO; |
| 3533 | else |
| 3534 | ret = size; |
| 3535 | } |
Lyude Paul | 4c0a9b6 | 2020-03-06 18:49:21 -0500 | [diff] [blame] | 3536 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3537 | kfree(txmsg); |
| 3538 | fail_put: |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 3539 | drm_dp_mst_topology_put_mstb(mstb); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3540 | return ret; |
| 3541 | } |
| 3542 | |
| 3543 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) |
| 3544 | { |
| 3545 | struct drm_dp_sideband_msg_reply_body reply; |
| 3546 | |
Ville Syrjälä | 45bbda1 | 2019-01-22 22:03:00 +0200 | [diff] [blame] | 3547 | reply.reply_type = DP_SIDEBAND_REPLY_ACK; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3548 | reply.req_type = req_type; |
| 3549 | drm_dp_encode_sideband_reply(&reply, msg); |
| 3550 | return 0; |
| 3551 | } |
| 3552 | |
| 3553 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, |
| 3554 | struct drm_dp_mst_branch *mstb, |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3555 | int req_type, bool broadcast) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3556 | { |
| 3557 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3558 | |
| 3559 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 3560 | if (!txmsg) |
| 3561 | return -ENOMEM; |
| 3562 | |
| 3563 | txmsg->dst = mstb; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3564 | drm_dp_encode_up_ack_reply(txmsg, req_type); |
| 3565 | |
| 3566 | mutex_lock(&mgr->qlock); |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3567 | /* construct a chunk from the first msg in the tx_msg queue */ |
| 3568 | process_single_tx_qlock(mgr, txmsg, true); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3569 | mutex_unlock(&mgr->qlock); |
Mykola Lysenko | 1f16ee7f | 2015-12-18 17:14:43 -0500 | [diff] [blame] | 3570 | |
| 3571 | kfree(txmsg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3572 | return 0; |
| 3573 | } |
| 3574 | |
Imre Deak | 83404d5 | 2021-01-25 19:36:35 +0200 | [diff] [blame] | 3575 | /** |
| 3576 | * drm_dp_get_vc_payload_bw - get the VC payload BW for an MST link |
Lyude Paul | c869c5f | 2021-04-23 14:43:05 -0400 | [diff] [blame] | 3577 | * @mgr: The &drm_dp_mst_topology_mgr to use |
Imre Deak | 83404d5 | 2021-01-25 19:36:35 +0200 | [diff] [blame] | 3578 | * @link_rate: link rate in 10kbits/s units |
| 3579 | * @link_lane_count: lane count |
| 3580 | * |
| 3581 | * Calculate the total bandwidth of a MultiStream Transport link. The returned |
| 3582 | * value is in units of PBNs/(timeslots/1 MTP). This value can be used to |
| 3583 | * convert the number of PBNs required for a given stream to the number of |
| 3584 | * timeslots this stream requires in each MTP. |
Imre Deak | 191dc43 | 2023-11-16 15:18:31 +0200 | [diff] [blame] | 3585 | * |
| 3586 | * Returns the BW / timeslot value in 20.12 fixed point format. |
Imre Deak | 83404d5 | 2021-01-25 19:36:35 +0200 | [diff] [blame] | 3587 | */ |
Imre Deak | 191dc43 | 2023-11-16 15:18:31 +0200 | [diff] [blame] | 3588 | fixed20_12 drm_dp_get_vc_payload_bw(const struct drm_dp_mst_topology_mgr *mgr, |
| 3589 | int link_rate, int link_lane_count) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3590 | { |
Imre Deak | d389989 | 2023-11-17 17:09:27 +0200 | [diff] [blame] | 3591 | int ch_coding_efficiency = |
| 3592 | drm_dp_bw_channel_coding_efficiency(drm_dp_is_uhbr_rate(link_rate)); |
Imre Deak | 191dc43 | 2023-11-16 15:18:31 +0200 | [diff] [blame] | 3593 | fixed20_12 ret; |
| 3594 | |
Imre Deak | 83404d5 | 2021-01-25 19:36:35 +0200 | [diff] [blame] | 3595 | if (link_rate == 0 || link_lane_count == 0) |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3596 | drm_dbg_kms(mgr->dev, "invalid link rate/lane count: (%d / %d)\n", |
| 3597 | link_rate, link_lane_count); |
Chris Wilson | b853fdb | 2014-11-12 10:13:37 +0000 | [diff] [blame] | 3598 | |
Imre Deak | d389989 | 2023-11-17 17:09:27 +0200 | [diff] [blame] | 3599 | /* See DP v2.0 2.6.4.2, 2.7.6.3 VCPayload_Bandwidth_for_OneTimeSlotPer_MTP_Allocation */ |
| 3600 | ret.full = DIV_ROUND_DOWN_ULL(mul_u32_u32(link_rate * link_lane_count, |
| 3601 | ch_coding_efficiency), |
| 3602 | (1000000ULL * 8 * 5400) >> 12); |
Imre Deak | 191dc43 | 2023-11-16 15:18:31 +0200 | [diff] [blame] | 3603 | |
| 3604 | return ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3605 | } |
Imre Deak | 83404d5 | 2021-01-25 19:36:35 +0200 | [diff] [blame] | 3606 | EXPORT_SYMBOL(drm_dp_get_vc_payload_bw); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3607 | |
| 3608 | /** |
Jani Nikula | 281a2cc | 2024-03-19 11:12:48 +0200 | [diff] [blame] | 3609 | * drm_dp_read_mst_cap() - Read the sink's MST mode capability |
Lyude Paul | 4b465912 | 2020-08-26 14:24:45 -0400 | [diff] [blame] | 3610 | * @aux: The DP AUX channel to use |
| 3611 | * @dpcd: A cached copy of the DPCD capabilities for this sink |
| 3612 | * |
Jani Nikula | 281a2cc | 2024-03-19 11:12:48 +0200 | [diff] [blame] | 3613 | * Returns: enum drm_dp_mst_mode to indicate MST mode capability |
Lyude Paul | 4b465912 | 2020-08-26 14:24:45 -0400 | [diff] [blame] | 3614 | */ |
Jani Nikula | 281a2cc | 2024-03-19 11:12:48 +0200 | [diff] [blame] | 3615 | enum drm_dp_mst_mode drm_dp_read_mst_cap(struct drm_dp_aux *aux, |
| 3616 | const u8 dpcd[DP_RECEIVER_CAP_SIZE]) |
Lyude Paul | 4b465912 | 2020-08-26 14:24:45 -0400 | [diff] [blame] | 3617 | { |
| 3618 | u8 mstm_cap; |
| 3619 | |
| 3620 | if (dpcd[DP_DPCD_REV] < DP_DPCD_REV_12) |
Jani Nikula | 281a2cc | 2024-03-19 11:12:48 +0200 | [diff] [blame] | 3621 | return DRM_DP_SST; |
Lyude Paul | 4b465912 | 2020-08-26 14:24:45 -0400 | [diff] [blame] | 3622 | |
| 3623 | if (drm_dp_dpcd_readb(aux, DP_MSTM_CAP, &mstm_cap) != 1) |
Jani Nikula | 281a2cc | 2024-03-19 11:12:48 +0200 | [diff] [blame] | 3624 | return DRM_DP_SST; |
Lyude Paul | 4b465912 | 2020-08-26 14:24:45 -0400 | [diff] [blame] | 3625 | |
Jani Nikula | 281a2cc | 2024-03-19 11:12:48 +0200 | [diff] [blame] | 3626 | if (mstm_cap & DP_MST_CAP) |
| 3627 | return DRM_DP_MST; |
| 3628 | |
| 3629 | if (mstm_cap & DP_SINGLE_STREAM_SIDEBAND_MSG) |
| 3630 | return DRM_DP_SST_SIDEBAND_MSG; |
| 3631 | |
| 3632 | return DRM_DP_SST; |
Lyude Paul | 4b465912 | 2020-08-26 14:24:45 -0400 | [diff] [blame] | 3633 | } |
| 3634 | EXPORT_SYMBOL(drm_dp_read_mst_cap); |
| 3635 | |
| 3636 | /** |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3637 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager |
| 3638 | * @mgr: manager to set state for |
| 3639 | * @mst_state: true to enable MST on this connector - false to disable. |
| 3640 | * |
| 3641 | * This is called by the driver when it detects an MST capable device plugged |
| 3642 | * into a DP MST capable port, or when a DP MST capable device is unplugged. |
| 3643 | */ |
| 3644 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) |
| 3645 | { |
| 3646 | int ret = 0; |
| 3647 | struct drm_dp_mst_branch *mstb = NULL; |
| 3648 | |
| 3649 | mutex_lock(&mgr->lock); |
| 3650 | if (mst_state == mgr->mst_state) |
| 3651 | goto out_unlock; |
| 3652 | |
| 3653 | mgr->mst_state = mst_state; |
| 3654 | /* set the device into MST mode */ |
| 3655 | if (mst_state) { |
| 3656 | WARN_ON(mgr->mst_primary); |
| 3657 | |
| 3658 | /* get dpcd info */ |
Nikola Cornij | 98025a6 | 2021-04-29 18:11:51 -0400 | [diff] [blame] | 3659 | ret = drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd); |
| 3660 | if (ret < 0) { |
| 3661 | drm_dbg_kms(mgr->dev, "%s: failed to read DPCD, ret %d\n", |
| 3662 | mgr->aux->name, ret); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3663 | goto out_unlock; |
| 3664 | } |
| 3665 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3666 | /* add initial branch device at LCT 1 */ |
| 3667 | mstb = drm_dp_add_mst_branch_device(1, NULL); |
| 3668 | if (mstb == NULL) { |
| 3669 | ret = -ENOMEM; |
| 3670 | goto out_unlock; |
| 3671 | } |
| 3672 | mstb->mgr = mgr; |
| 3673 | |
| 3674 | /* give this the main reference */ |
| 3675 | mgr->mst_primary = mstb; |
Lyude Paul | ebcc0e6 | 2019-01-10 19:53:29 -0500 | [diff] [blame] | 3676 | drm_dp_mst_topology_get_mstb(mgr->mst_primary); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3677 | |
Andrey Grodzovsky | c175cd1 | 2016-01-22 17:07:29 -0500 | [diff] [blame] | 3678 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
Lyude Paul | 3ff4c24 | 2020-01-17 17:47:48 -0500 | [diff] [blame] | 3679 | DP_MST_EN | |
| 3680 | DP_UP_REQ_EN | |
| 3681 | DP_UPSTREAM_IS_SRC); |
José Roberto de Souza | 7a3cbf5 | 2020-01-16 17:58:35 -0800 | [diff] [blame] | 3682 | if (ret < 0) |
Andrey Grodzovsky | c175cd1 | 2016-01-22 17:07:29 -0500 | [diff] [blame] | 3683 | goto out_unlock; |
Andrey Grodzovsky | c175cd1 | 2016-01-22 17:07:29 -0500 | [diff] [blame] | 3684 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 3685 | /* Write reset payload */ |
| 3686 | drm_dp_dpcd_write_payload(mgr, 0, 0, 0x3f); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3687 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3688 | queue_work(system_long_wq, &mgr->work); |
| 3689 | |
| 3690 | ret = 0; |
| 3691 | } else { |
| 3692 | /* disable MST on the device */ |
| 3693 | mstb = mgr->mst_primary; |
| 3694 | mgr->mst_primary = NULL; |
| 3695 | /* this can fail if the device is gone */ |
| 3696 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); |
| 3697 | ret = 0; |
Sean Paul | f794890 | 2019-08-28 20:09:44 -0400 | [diff] [blame] | 3698 | mgr->payload_id_table_cleared = false; |
Imre Deak | 1d08261 | 2022-12-14 20:42:56 +0200 | [diff] [blame] | 3699 | |
| 3700 | memset(&mgr->down_rep_recv, 0, sizeof(mgr->down_rep_recv)); |
| 3701 | memset(&mgr->up_req_recv, 0, sizeof(mgr->up_req_recv)); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3702 | } |
| 3703 | |
| 3704 | out_unlock: |
| 3705 | mutex_unlock(&mgr->lock); |
| 3706 | if (mstb) |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 3707 | drm_dp_mst_topology_put_mstb(mstb); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3708 | return ret; |
| 3709 | |
| 3710 | } |
| 3711 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); |
| 3712 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3713 | static void |
| 3714 | drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb) |
| 3715 | { |
| 3716 | struct drm_dp_mst_port *port; |
| 3717 | |
| 3718 | /* The link address will need to be re-sent on resume */ |
| 3719 | mstb->link_address_sent = false; |
| 3720 | |
Lyude Paul | 87212b5 | 2020-03-06 18:46:21 -0500 | [diff] [blame] | 3721 | list_for_each_entry(port, &mstb->ports, next) |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3722 | if (port->mstb) |
| 3723 | drm_dp_mst_topology_mgr_invalidate_mstb(port->mstb); |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3724 | } |
| 3725 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3726 | /** |
| 3727 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager |
| 3728 | * @mgr: manager to suspend |
| 3729 | * |
| 3730 | * This function tells the MST device that we can't handle UP messages |
| 3731 | * anymore. This should stop it from sending any since we are suspended. |
| 3732 | */ |
| 3733 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) |
| 3734 | { |
| 3735 | mutex_lock(&mgr->lock); |
| 3736 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
| 3737 | DP_MST_EN | DP_UPSTREAM_IS_SRC); |
| 3738 | mutex_unlock(&mgr->lock); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 3739 | flush_work(&mgr->up_req_work); |
Dave Airlie | 274d835 | 2015-09-30 10:39:42 +1000 | [diff] [blame] | 3740 | flush_work(&mgr->work); |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 3741 | flush_work(&mgr->delayed_destroy_work); |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3742 | |
| 3743 | mutex_lock(&mgr->lock); |
| 3744 | if (mgr->mst_state && mgr->mst_primary) |
| 3745 | drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary); |
| 3746 | mutex_unlock(&mgr->lock); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3747 | } |
| 3748 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); |
| 3749 | |
| 3750 | /** |
| 3751 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager |
| 3752 | * @mgr: manager to resume |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3753 | * @sync: whether or not to perform topology reprobing synchronously |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3754 | * |
| 3755 | * This will fetch DPCD and see if the device is still there, |
| 3756 | * if it is, it will rewrite the MSTM control bits, and return. |
| 3757 | * |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3758 | * If the device fails this returns -1, and the driver should do |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3759 | * a full MST reprobe, in case we were undocked. |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3760 | * |
| 3761 | * During system resume (where it is assumed that the driver will be calling |
| 3762 | * drm_atomic_helper_resume()) this function should be called beforehand with |
| 3763 | * @sync set to true. In contexts like runtime resume where the driver is not |
| 3764 | * expected to be calling drm_atomic_helper_resume(), this function should be |
| 3765 | * called with @sync set to false in order to avoid deadlocking. |
| 3766 | * |
| 3767 | * Returns: -1 if the MST topology was removed while we were suspended, 0 |
| 3768 | * otherwise. |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3769 | */ |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3770 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, |
| 3771 | bool sync) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3772 | { |
Lyude Paul | 79413ed | 2019-10-09 15:14:59 -0400 | [diff] [blame] | 3773 | int ret; |
| 3774 | u8 guid[16]; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3775 | |
| 3776 | mutex_lock(&mgr->lock); |
Lyude Paul | 79413ed | 2019-10-09 15:14:59 -0400 | [diff] [blame] | 3777 | if (!mgr->mst_primary) |
| 3778 | goto out_fail; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3779 | |
Imre Deak | 7a710a8 | 2022-06-14 12:45:37 +0300 | [diff] [blame] | 3780 | if (drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd) < 0) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3781 | drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n"); |
Lyude Paul | 79413ed | 2019-10-09 15:14:59 -0400 | [diff] [blame] | 3782 | goto out_fail; |
| 3783 | } |
Lyude | 1652fce | 2016-04-13 16:50:18 -0400 | [diff] [blame] | 3784 | |
Lyude Paul | 79413ed | 2019-10-09 15:14:59 -0400 | [diff] [blame] | 3785 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
| 3786 | DP_MST_EN | |
| 3787 | DP_UP_REQ_EN | |
| 3788 | DP_UPSTREAM_IS_SRC); |
| 3789 | if (ret < 0) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3790 | drm_dbg_kms(mgr->dev, "mst write failed - undocked during suspend?\n"); |
Lyude Paul | 79413ed | 2019-10-09 15:14:59 -0400 | [diff] [blame] | 3791 | goto out_fail; |
| 3792 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3793 | |
Lyude Paul | 79413ed | 2019-10-09 15:14:59 -0400 | [diff] [blame] | 3794 | /* Some hubs forget their guids after they resume */ |
| 3795 | ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); |
| 3796 | if (ret != 16) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3797 | drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n"); |
Lyude Paul | 79413ed | 2019-10-09 15:14:59 -0400 | [diff] [blame] | 3798 | goto out_fail; |
| 3799 | } |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 3800 | |
| 3801 | ret = drm_dp_check_mstb_guid(mgr->mst_primary, guid); |
| 3802 | if (ret) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3803 | drm_dbg_kms(mgr->dev, "check mstb failed - undocked during suspend?\n"); |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 3804 | goto out_fail; |
| 3805 | } |
Lyude | 1652fce | 2016-04-13 16:50:18 -0400 | [diff] [blame] | 3806 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3807 | /* |
| 3808 | * For the final step of resuming the topology, we need to bring the |
| 3809 | * state of our in-memory topology back into sync with reality. So, |
| 3810 | * restart the probing process as if we're probing a new hub |
| 3811 | */ |
| 3812 | queue_work(system_long_wq, &mgr->work); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3813 | mutex_unlock(&mgr->lock); |
Lyude Paul | 79413ed | 2019-10-09 15:14:59 -0400 | [diff] [blame] | 3814 | |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3815 | if (sync) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3816 | drm_dbg_kms(mgr->dev, |
| 3817 | "Waiting for link probe work to finish re-syncing topology...\n"); |
Lyude Paul | 6f85f73 | 2019-06-17 19:57:33 -0400 | [diff] [blame] | 3818 | flush_work(&mgr->work); |
| 3819 | } |
| 3820 | |
Lyude Paul | 79413ed | 2019-10-09 15:14:59 -0400 | [diff] [blame] | 3821 | return 0; |
| 3822 | |
| 3823 | out_fail: |
| 3824 | mutex_unlock(&mgr->lock); |
| 3825 | return -1; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3826 | } |
| 3827 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); |
| 3828 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3829 | static bool |
| 3830 | drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up, |
| 3831 | struct drm_dp_mst_branch **mstb) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3832 | { |
| 3833 | int len; |
| 3834 | u8 replyblock[32]; |
Bo YU | b37ea8b | 2020-01-18 16:06:28 +0800 | [diff] [blame] | 3835 | int replylen, curreply; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3836 | int ret; |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 3837 | u8 hdrlen; |
| 3838 | struct drm_dp_sideband_msg_hdr hdr; |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3839 | struct drm_dp_sideband_msg_rx *msg = |
| 3840 | up ? &mgr->up_req_recv : &mgr->down_rep_recv; |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 3841 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : |
| 3842 | DP_SIDEBAND_MSG_DOWN_REP_BASE; |
| 3843 | |
Lyude Paul | cbfb1b7 | 2020-04-06 15:33:52 -0400 | [diff] [blame] | 3844 | if (!up) |
| 3845 | *mstb = NULL; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3846 | |
| 3847 | len = min(mgr->max_dpcd_transaction_bytes, 16); |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 3848 | ret = drm_dp_dpcd_read(mgr->aux, basereg, replyblock, len); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3849 | if (ret != len) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3850 | drm_dbg_kms(mgr->dev, "failed to read DPCD down rep %d %d\n", len, ret); |
Imre Deak | 636c4c3 | 2017-07-19 16:46:32 +0300 | [diff] [blame] | 3851 | return false; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3852 | } |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 3853 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3854 | ret = drm_dp_decode_sideband_msg_hdr(mgr, &hdr, replyblock, len, &hdrlen); |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 3855 | if (ret == false) { |
| 3856 | print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, |
| 3857 | 1, replyblock, len, false); |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3858 | drm_dbg_kms(mgr->dev, "ERROR: failed header\n"); |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 3859 | return false; |
| 3860 | } |
| 3861 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3862 | if (!up) { |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3863 | /* Caller is responsible for giving back this reference */ |
| 3864 | *mstb = drm_dp_get_mst_branch_device(mgr, hdr.lct, hdr.rad); |
| 3865 | if (!*mstb) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3866 | drm_dbg_kms(mgr->dev, "Got MST reply from unknown device %d\n", hdr.lct); |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3867 | return false; |
| 3868 | } |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3869 | } |
| 3870 | |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 3871 | if (!drm_dp_sideband_msg_set_header(msg, &hdr, hdrlen)) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3872 | drm_dbg_kms(mgr->dev, "sideband msg set header failed %d\n", replyblock[0]); |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 3873 | return false; |
| 3874 | } |
| 3875 | |
| 3876 | replylen = min(msg->curchunk_len, (u8)(len - hdrlen)); |
| 3877 | ret = drm_dp_sideband_append_payload(msg, replyblock + hdrlen, replylen); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3878 | if (!ret) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3879 | drm_dbg_kms(mgr->dev, "sideband msg build failed %d\n", replyblock[0]); |
Imre Deak | 636c4c3 | 2017-07-19 16:46:32 +0300 | [diff] [blame] | 3880 | return false; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3881 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3882 | |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 3883 | replylen = msg->curchunk_len + msg->curchunk_hdrlen - len; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3884 | curreply = len; |
| 3885 | while (replylen > 0) { |
| 3886 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); |
| 3887 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, |
| 3888 | replyblock, len); |
| 3889 | if (ret != len) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3890 | drm_dbg_kms(mgr->dev, "failed to read a chunk (len %d, ret %d)\n", |
| 3891 | len, ret); |
Imre Deak | 636c4c3 | 2017-07-19 16:46:32 +0300 | [diff] [blame] | 3892 | return false; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3893 | } |
Imre Deak | 448421b | 2017-07-19 14:43:28 +0300 | [diff] [blame] | 3894 | |
Sean Paul | 21a729d | 2020-02-13 16:15:18 -0500 | [diff] [blame] | 3895 | ret = drm_dp_sideband_append_payload(msg, replyblock, len); |
Imre Deak | 448421b | 2017-07-19 14:43:28 +0300 | [diff] [blame] | 3896 | if (!ret) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3897 | drm_dbg_kms(mgr->dev, "failed to build sideband msg\n"); |
Imre Deak | 636c4c3 | 2017-07-19 16:46:32 +0300 | [diff] [blame] | 3898 | return false; |
Imre Deak | 448421b | 2017-07-19 14:43:28 +0300 | [diff] [blame] | 3899 | } |
| 3900 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3901 | curreply += len; |
| 3902 | replylen -= len; |
| 3903 | } |
Imre Deak | 636c4c3 | 2017-07-19 16:46:32 +0300 | [diff] [blame] | 3904 | return true; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3905 | } |
| 3906 | |
| 3907 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) |
| 3908 | { |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3909 | struct drm_dp_sideband_msg_tx *txmsg; |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3910 | struct drm_dp_mst_branch *mstb = NULL; |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3911 | struct drm_dp_sideband_msg_rx *msg = &mgr->down_rep_recv; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3912 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3913 | if (!drm_dp_get_one_sb_msg(mgr, false, &mstb)) |
Imre Deak | 1241aed | 2022-12-14 20:42:57 +0200 | [diff] [blame] | 3914 | goto out_clear_reply; |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3915 | |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3916 | /* Multi-packet message transmission, don't clear the reply */ |
| 3917 | if (!msg->have_eomt) |
| 3918 | goto out; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3919 | |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3920 | /* find the message */ |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3921 | mutex_lock(&mgr->qlock); |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3922 | txmsg = list_first_entry_or_null(&mgr->tx_msg_downq, |
| 3923 | struct drm_dp_sideband_msg_tx, next); |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3924 | mutex_unlock(&mgr->qlock); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3925 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3926 | /* Were we actually expecting a response, and from this mstb? */ |
| 3927 | if (!txmsg || txmsg->dst != mstb) { |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3928 | struct drm_dp_sideband_msg_hdr *hdr; |
Suraj Upadhyay | 948de842 | 2020-07-02 18:53:32 +0530 | [diff] [blame] | 3929 | |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3930 | hdr = &msg->initial_hdr; |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3931 | drm_dbg_kms(mgr->dev, "Got MST reply with no msg %p %d %d %02x %02x\n", |
| 3932 | mstb, hdr->seqno, hdr->lct, hdr->rad[0], msg->msg[0]); |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3933 | goto out_clear_reply; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3934 | } |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3935 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3936 | drm_dp_sideband_parse_reply(mgr, msg, &txmsg->reply); |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3937 | |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3938 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3939 | drm_dbg_kms(mgr->dev, |
| 3940 | "Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n", |
| 3941 | txmsg->reply.req_type, |
| 3942 | drm_dp_mst_req_type_str(txmsg->reply.req_type), |
| 3943 | txmsg->reply.u.nak.reason, |
| 3944 | drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason), |
| 3945 | txmsg->reply.u.nak.nak_data); |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3946 | } |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3947 | |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3948 | memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3949 | drm_dp_mst_topology_put_mstb(mstb); |
| 3950 | |
| 3951 | mutex_lock(&mgr->qlock); |
| 3952 | txmsg->state = DRM_DP_SIDEBAND_TX_RX; |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3953 | list_del(&txmsg->next); |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3954 | mutex_unlock(&mgr->qlock); |
| 3955 | |
| 3956 | wake_up_all(&mgr->tx_waitq); |
| 3957 | |
| 3958 | return 0; |
| 3959 | |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3960 | out_clear_reply: |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 3961 | memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 3962 | out: |
| 3963 | if (mstb) |
| 3964 | drm_dp_mst_topology_put_mstb(mstb); |
Lyude Paul | 8b1e589 | 2019-09-03 16:45:51 -0400 | [diff] [blame] | 3965 | |
| 3966 | return 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3967 | } |
| 3968 | |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 3969 | static inline bool |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 3970 | drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr, |
| 3971 | struct drm_dp_pending_up_req *up_req) |
| 3972 | { |
| 3973 | struct drm_dp_mst_branch *mstb = NULL; |
| 3974 | struct drm_dp_sideband_msg_req_body *msg = &up_req->msg; |
| 3975 | struct drm_dp_sideband_msg_hdr *hdr = &up_req->hdr; |
Lyude Paul | 2482fce | 2022-08-17 15:38:43 -0400 | [diff] [blame] | 3976 | bool hotplug = false, dowork = false; |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 3977 | |
| 3978 | if (hdr->broadcast) { |
| 3979 | const u8 *guid = NULL; |
| 3980 | |
| 3981 | if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) |
| 3982 | guid = msg->u.conn_stat.guid; |
| 3983 | else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY) |
| 3984 | guid = msg->u.resource_stat.guid; |
| 3985 | |
José Roberto de Souza | 8ccb5bf | 2020-01-29 15:24:48 -0800 | [diff] [blame] | 3986 | if (guid) |
| 3987 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, guid); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 3988 | } else { |
| 3989 | mstb = drm_dp_get_mst_branch_device(mgr, hdr->lct, hdr->rad); |
| 3990 | } |
| 3991 | |
| 3992 | if (!mstb) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 3993 | drm_dbg_kms(mgr->dev, "Got MST reply from unknown device %d\n", hdr->lct); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 3994 | return false; |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 3995 | } |
| 3996 | |
| 3997 | /* TODO: Add missing handler for DP_RESOURCE_STATUS_NOTIFY events */ |
| 3998 | if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) { |
Lyude Paul | 2482fce | 2022-08-17 15:38:43 -0400 | [diff] [blame] | 3999 | dowork = drm_dp_mst_handle_conn_stat(mstb, &msg->u.conn_stat); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4000 | hotplug = true; |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4001 | } |
| 4002 | |
| 4003 | drm_dp_mst_topology_put_mstb(mstb); |
Lyude Paul | 2482fce | 2022-08-17 15:38:43 -0400 | [diff] [blame] | 4004 | |
| 4005 | if (dowork) |
| 4006 | queue_work(system_long_wq, &mgr->work); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4007 | return hotplug; |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4008 | } |
| 4009 | |
| 4010 | static void drm_dp_mst_up_req_work(struct work_struct *work) |
| 4011 | { |
| 4012 | struct drm_dp_mst_topology_mgr *mgr = |
| 4013 | container_of(work, struct drm_dp_mst_topology_mgr, |
| 4014 | up_req_work); |
| 4015 | struct drm_dp_pending_up_req *up_req; |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4016 | bool send_hotplug = false; |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4017 | |
Lyude Paul | 14692a3 | 2019-10-16 16:02:59 -0400 | [diff] [blame] | 4018 | mutex_lock(&mgr->probe_lock); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4019 | while (true) { |
| 4020 | mutex_lock(&mgr->up_req_lock); |
| 4021 | up_req = list_first_entry_or_null(&mgr->up_req_list, |
| 4022 | struct drm_dp_pending_up_req, |
| 4023 | next); |
| 4024 | if (up_req) |
| 4025 | list_del(&up_req->next); |
| 4026 | mutex_unlock(&mgr->up_req_lock); |
| 4027 | |
| 4028 | if (!up_req) |
| 4029 | break; |
| 4030 | |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4031 | send_hotplug |= drm_dp_mst_process_up_req(mgr, up_req); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4032 | kfree(up_req); |
| 4033 | } |
Lyude Paul | 14692a3 | 2019-10-16 16:02:59 -0400 | [diff] [blame] | 4034 | mutex_unlock(&mgr->probe_lock); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4035 | |
| 4036 | if (send_hotplug) |
| 4037 | drm_kms_helper_hotplug_event(mgr->dev); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4038 | } |
| 4039 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4040 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) |
| 4041 | { |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4042 | struct drm_dp_pending_up_req *up_req; |
Imre Deak | 636c4c3 | 2017-07-19 16:46:32 +0300 | [diff] [blame] | 4043 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 4044 | if (!drm_dp_get_one_sb_msg(mgr, true, NULL)) |
Lyude Paul | a29d881 | 2019-09-03 16:45:50 -0400 | [diff] [blame] | 4045 | goto out; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4046 | |
Lyude Paul | 60f9ae9 | 2019-09-03 16:45:48 -0400 | [diff] [blame] | 4047 | if (!mgr->up_req_recv.have_eomt) |
| 4048 | return 0; |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 4049 | |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4050 | up_req = kzalloc(sizeof(*up_req), GFP_KERNEL); |
Lyude Paul | 90876fd | 2021-03-26 16:38:06 -0400 | [diff] [blame] | 4051 | if (!up_req) |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4052 | return -ENOMEM; |
Lyude Paul | 90876fd | 2021-03-26 16:38:06 -0400 | [diff] [blame] | 4053 | |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4054 | INIT_LIST_HEAD(&up_req->next); |
Lyude Paul | 60f9ae9 | 2019-09-03 16:45:48 -0400 | [diff] [blame] | 4055 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4056 | drm_dp_sideband_parse_req(mgr, &mgr->up_req_recv, &up_req->msg); |
Lyude Paul | 60f9ae9 | 2019-09-03 16:45:48 -0400 | [diff] [blame] | 4057 | |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4058 | if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY && |
| 4059 | up_req->msg.req_type != DP_RESOURCE_STATUS_NOTIFY) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4060 | drm_dbg_kms(mgr->dev, "Received unknown up req type, ignoring: %x\n", |
| 4061 | up_req->msg.req_type); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4062 | kfree(up_req); |
Lyude Paul | a29d881 | 2019-09-03 16:45:50 -0400 | [diff] [blame] | 4063 | goto out; |
Lyude Paul | 60f9ae9 | 2019-09-03 16:45:48 -0400 | [diff] [blame] | 4064 | } |
| 4065 | |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4066 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, up_req->msg.req_type, |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 4067 | false); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4068 | |
| 4069 | if (up_req->msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { |
| 4070 | const struct drm_dp_connection_status_notify *conn_stat = |
| 4071 | &up_req->msg.u.conn_stat; |
Wayne Lin | ddf9834 | 2024-06-26 16:48:24 +0800 | [diff] [blame] | 4072 | bool handle_csn; |
Lyude Paul | 60f9ae9 | 2019-09-03 16:45:48 -0400 | [diff] [blame] | 4073 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4074 | drm_dbg_kms(mgr->dev, "Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", |
| 4075 | conn_stat->port_number, |
| 4076 | conn_stat->legacy_device_plug_status, |
| 4077 | conn_stat->displayport_device_plug_status, |
| 4078 | conn_stat->message_capability_status, |
| 4079 | conn_stat->input_port, |
| 4080 | conn_stat->peer_device_type); |
Wayne Lin | ddf9834 | 2024-06-26 16:48:24 +0800 | [diff] [blame] | 4081 | |
| 4082 | mutex_lock(&mgr->probe_lock); |
| 4083 | handle_csn = mgr->mst_primary->link_address_sent; |
| 4084 | mutex_unlock(&mgr->probe_lock); |
| 4085 | |
| 4086 | if (!handle_csn) { |
| 4087 | drm_dbg_kms(mgr->dev, "Got CSN before finish topology probing. Skip it."); |
| 4088 | kfree(up_req); |
| 4089 | goto out; |
| 4090 | } |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4091 | } else if (up_req->msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { |
| 4092 | const struct drm_dp_resource_status_notify *res_stat = |
| 4093 | &up_req->msg.u.resource_stat; |
Lyude Paul | a29d881 | 2019-09-03 16:45:50 -0400 | [diff] [blame] | 4094 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4095 | drm_dbg_kms(mgr->dev, "Got RSN: pn: %d avail_pbn %d\n", |
| 4096 | res_stat->port_number, |
| 4097 | res_stat->available_pbn); |
Lyude Paul | a29d881 | 2019-09-03 16:45:50 -0400 | [diff] [blame] | 4098 | } |
| 4099 | |
Sean Paul | fbc821c | 2020-02-13 16:15:19 -0500 | [diff] [blame] | 4100 | up_req->hdr = mgr->up_req_recv.initial_hdr; |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 4101 | mutex_lock(&mgr->up_req_lock); |
| 4102 | list_add_tail(&up_req->next, &mgr->up_req_list); |
| 4103 | mutex_unlock(&mgr->up_req_lock); |
| 4104 | queue_work(system_long_wq, &mgr->up_req_work); |
| 4105 | |
Lyude Paul | a29d881 | 2019-09-03 16:45:50 -0400 | [diff] [blame] | 4106 | out: |
Lyude Paul | 60f9ae9 | 2019-09-03 16:45:48 -0400 | [diff] [blame] | 4107 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
Lyude Paul | 60f9ae9 | 2019-09-03 16:45:48 -0400 | [diff] [blame] | 4108 | return 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4109 | } |
| 4110 | |
| 4111 | /** |
Wayne Lin | 72f1de4 | 2023-04-17 17:08:12 +0800 | [diff] [blame] | 4112 | * drm_dp_mst_hpd_irq_handle_event() - MST hotplug IRQ handle MST event |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4113 | * @mgr: manager to notify irq for. |
| 4114 | * @esi: 4 bytes from SINK_COUNT_ESI |
Wayne Lin | 72f1de4 | 2023-04-17 17:08:12 +0800 | [diff] [blame] | 4115 | * @ack: 4 bytes used to ack events starting from SINK_COUNT_ESI |
Daniel Vetter | 295ee85 | 2014-07-30 14:23:44 +0200 | [diff] [blame] | 4116 | * @handled: whether the hpd interrupt was consumed or not |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4117 | * |
Wayne Lin | 72f1de4 | 2023-04-17 17:08:12 +0800 | [diff] [blame] | 4118 | * This should be called from the driver when it detects a HPD IRQ, |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4119 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The |
Wayne Lin | 72f1de4 | 2023-04-17 17:08:12 +0800 | [diff] [blame] | 4120 | * topology manager will process the sideband messages received |
| 4121 | * as indicated in the DEVICE_SERVICE_IRQ_VECTOR_ESI0 and set the |
| 4122 | * corresponding flags that Driver has to ack the DP receiver later. |
| 4123 | * |
| 4124 | * Note that driver shall also call |
| 4125 | * drm_dp_mst_hpd_irq_send_new_request() if the 'handled' is set |
| 4126 | * after calling this function, to try to kick off a new request in |
| 4127 | * the queue if the previous message transaction is completed. |
| 4128 | * |
| 4129 | * See also: |
| 4130 | * drm_dp_mst_hpd_irq_send_new_request() |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4131 | */ |
Wayne Lin | 72f1de4 | 2023-04-17 17:08:12 +0800 | [diff] [blame] | 4132 | int drm_dp_mst_hpd_irq_handle_event(struct drm_dp_mst_topology_mgr *mgr, const u8 *esi, |
| 4133 | u8 *ack, bool *handled) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4134 | { |
| 4135 | int ret = 0; |
| 4136 | int sc; |
| 4137 | *handled = false; |
Jani Nikula | f199f71 | 2022-01-04 20:48:57 +0200 | [diff] [blame] | 4138 | sc = DP_GET_SINK_COUNT(esi[0]); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4139 | |
| 4140 | if (sc != mgr->sink_count) { |
| 4141 | mgr->sink_count = sc; |
| 4142 | *handled = true; |
| 4143 | } |
| 4144 | |
| 4145 | if (esi[1] & DP_DOWN_REP_MSG_RDY) { |
| 4146 | ret = drm_dp_mst_handle_down_rep(mgr); |
| 4147 | *handled = true; |
Wayne Lin | 72f1de4 | 2023-04-17 17:08:12 +0800 | [diff] [blame] | 4148 | ack[1] |= DP_DOWN_REP_MSG_RDY; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4149 | } |
| 4150 | |
| 4151 | if (esi[1] & DP_UP_REQ_MSG_RDY) { |
| 4152 | ret |= drm_dp_mst_handle_up_req(mgr); |
| 4153 | *handled = true; |
Wayne Lin | 72f1de4 | 2023-04-17 17:08:12 +0800 | [diff] [blame] | 4154 | ack[1] |= DP_UP_REQ_MSG_RDY; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4155 | } |
| 4156 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4157 | return ret; |
| 4158 | } |
Wayne Lin | 72f1de4 | 2023-04-17 17:08:12 +0800 | [diff] [blame] | 4159 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq_handle_event); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4160 | |
| 4161 | /** |
Wayne Lin | 72f1de4 | 2023-04-17 17:08:12 +0800 | [diff] [blame] | 4162 | * drm_dp_mst_hpd_irq_send_new_request() - MST hotplug IRQ kick off new request |
| 4163 | * @mgr: manager to notify irq for. |
| 4164 | * |
| 4165 | * This should be called from the driver when mst irq event is handled |
| 4166 | * and acked. Note that new down request should only be sent when |
| 4167 | * previous message transaction is completed. Source is not supposed to generate |
| 4168 | * interleaved message transactions. |
| 4169 | */ |
| 4170 | void drm_dp_mst_hpd_irq_send_new_request(struct drm_dp_mst_topology_mgr *mgr) |
| 4171 | { |
| 4172 | struct drm_dp_sideband_msg_tx *txmsg; |
| 4173 | bool kick = true; |
| 4174 | |
| 4175 | mutex_lock(&mgr->qlock); |
| 4176 | txmsg = list_first_entry_or_null(&mgr->tx_msg_downq, |
| 4177 | struct drm_dp_sideband_msg_tx, next); |
| 4178 | /* If last transaction is not completed yet*/ |
| 4179 | if (!txmsg || |
| 4180 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || |
| 4181 | txmsg->state == DRM_DP_SIDEBAND_TX_SENT) |
| 4182 | kick = false; |
| 4183 | mutex_unlock(&mgr->qlock); |
| 4184 | |
| 4185 | if (kick) |
| 4186 | drm_dp_mst_kick_tx(mgr); |
| 4187 | } |
| 4188 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq_send_new_request); |
| 4189 | /** |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4190 | * drm_dp_mst_detect_port() - get connection status for an MST port |
Daniel Vetter | 132d49d | 2016-07-15 21:48:04 +0200 | [diff] [blame] | 4191 | * @connector: DRM connector for this port |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4192 | * @ctx: The acquisition context to use for grabbing locks |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4193 | * @mgr: manager for this port |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4194 | * @port: pointer to a port |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4195 | * |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4196 | * This returns the current connection state for a port. |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4197 | */ |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4198 | int |
| 4199 | drm_dp_mst_detect_port(struct drm_connector *connector, |
| 4200 | struct drm_modeset_acquire_ctx *ctx, |
| 4201 | struct drm_dp_mst_topology_mgr *mgr, |
| 4202 | struct drm_dp_mst_port *port) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4203 | { |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4204 | int ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4205 | |
Matt Roper | 1e55a53 | 2019-02-01 17:23:26 -0800 | [diff] [blame] | 4206 | /* we need to search for the port in the mgr in case it's gone */ |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 4207 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4208 | if (!port) |
| 4209 | return connector_status_disconnected; |
| 4210 | |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4211 | ret = drm_modeset_lock(&mgr->base.lock, ctx); |
| 4212 | if (ret) |
| 4213 | goto out; |
| 4214 | |
| 4215 | ret = connector_status_disconnected; |
| 4216 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4217 | if (!port->ddps) |
| 4218 | goto out; |
| 4219 | |
| 4220 | switch (port->pdt) { |
| 4221 | case DP_PEER_DEVICE_NONE: |
Imre Deak | 873e5bb | 2021-02-01 14:01:42 +0200 | [diff] [blame] | 4222 | break; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4223 | case DP_PEER_DEVICE_MST_BRANCHING: |
Wayne Lin | db1a079 | 2020-01-17 14:03:50 +0800 | [diff] [blame] | 4224 | if (!port->mcs) |
| 4225 | ret = connector_status_connected; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4226 | break; |
| 4227 | |
| 4228 | case DP_PEER_DEVICE_SST_SINK: |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4229 | ret = connector_status_connected; |
Dave Airlie | 8ae22cb | 2016-02-17 11:36:38 +1000 | [diff] [blame] | 4230 | /* for logical ports - cache the EDID */ |
Imre Deak | ca5d9d7 | 2024-04-17 01:10:07 +0300 | [diff] [blame] | 4231 | if (drm_dp_mst_port_is_logical(port) && !port->cached_edid) |
Jani Nikula | c1c9042 | 2023-05-30 12:08:24 +0300 | [diff] [blame] | 4232 | port->cached_edid = drm_edid_read_ddc(connector, &port->aux.ddc); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4233 | break; |
| 4234 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
| 4235 | if (port->ldps) |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4236 | ret = connector_status_connected; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4237 | break; |
| 4238 | } |
| 4239 | out: |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 4240 | drm_dp_mst_topology_put_port(port); |
Lyude Paul | 3f9b3f0 | 2019-06-17 17:59:29 -0400 | [diff] [blame] | 4241 | return ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4242 | } |
| 4243 | EXPORT_SYMBOL(drm_dp_mst_detect_port); |
| 4244 | |
| 4245 | /** |
Jani Nikula | c1c9042 | 2023-05-30 12:08:24 +0300 | [diff] [blame] | 4246 | * drm_dp_mst_edid_read() - get EDID for an MST port |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4247 | * @connector: toplevel connector to get EDID for |
| 4248 | * @mgr: manager for this port |
| 4249 | * @port: unverified pointer to a port. |
| 4250 | * |
| 4251 | * This returns an EDID for the port connected to a connector, |
| 4252 | * It validates the pointer still exists so the caller doesn't require a |
| 4253 | * reference. |
| 4254 | */ |
Jani Nikula | c1c9042 | 2023-05-30 12:08:24 +0300 | [diff] [blame] | 4255 | const struct drm_edid *drm_dp_mst_edid_read(struct drm_connector *connector, |
| 4256 | struct drm_dp_mst_topology_mgr *mgr, |
| 4257 | struct drm_dp_mst_port *port) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4258 | { |
Jani Nikula | c1c9042 | 2023-05-30 12:08:24 +0300 | [diff] [blame] | 4259 | const struct drm_edid *drm_edid; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4260 | |
Matt Roper | 1e55a53 | 2019-02-01 17:23:26 -0800 | [diff] [blame] | 4261 | /* we need to search for the port in the mgr in case it's gone */ |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 4262 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4263 | if (!port) |
| 4264 | return NULL; |
| 4265 | |
Dave Airlie | c6a0aed | 2014-10-20 16:28:02 +1000 | [diff] [blame] | 4266 | if (port->cached_edid) |
Jani Nikula | c1c9042 | 2023-05-30 12:08:24 +0300 | [diff] [blame] | 4267 | drm_edid = drm_edid_dup(port->cached_edid); |
| 4268 | else |
| 4269 | drm_edid = drm_edid_read_ddc(connector, &port->aux.ddc); |
Jani Nikula | 3d35ddf | 2023-05-30 12:08:14 +0300 | [diff] [blame] | 4270 | |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 4271 | drm_dp_mst_topology_put_port(port); |
Jani Nikula | c1c9042 | 2023-05-30 12:08:24 +0300 | [diff] [blame] | 4272 | |
| 4273 | return drm_edid; |
| 4274 | } |
| 4275 | EXPORT_SYMBOL(drm_dp_mst_edid_read); |
| 4276 | |
| 4277 | /** |
| 4278 | * drm_dp_mst_get_edid() - get EDID for an MST port |
| 4279 | * @connector: toplevel connector to get EDID for |
| 4280 | * @mgr: manager for this port |
| 4281 | * @port: unverified pointer to a port. |
| 4282 | * |
| 4283 | * This function is deprecated; please use drm_dp_mst_edid_read() instead. |
| 4284 | * |
| 4285 | * This returns an EDID for the port connected to a connector, |
| 4286 | * It validates the pointer still exists so the caller doesn't require a |
| 4287 | * reference. |
| 4288 | */ |
| 4289 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, |
| 4290 | struct drm_dp_mst_topology_mgr *mgr, |
| 4291 | struct drm_dp_mst_port *port) |
| 4292 | { |
| 4293 | const struct drm_edid *drm_edid; |
| 4294 | struct edid *edid; |
| 4295 | |
| 4296 | drm_edid = drm_dp_mst_edid_read(connector, mgr, port); |
| 4297 | |
| 4298 | edid = drm_edid_duplicate(drm_edid_raw(drm_edid)); |
| 4299 | |
| 4300 | drm_edid_free(drm_edid); |
| 4301 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4302 | return edid; |
| 4303 | } |
| 4304 | EXPORT_SYMBOL(drm_dp_mst_get_edid); |
| 4305 | |
| 4306 | /** |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4307 | * drm_dp_atomic_find_time_slots() - Find and add time slots to the state |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4308 | * @state: global atomic state |
| 4309 | * @mgr: MST topology manager for the port |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4310 | * @port: port to find time slots for |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4311 | * @pbn: bandwidth required for the mode in PBN |
| 4312 | * |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4313 | * Allocates time slots to @port, replacing any previous time slot allocations it may |
| 4314 | * have had. Any atomic drivers which support MST must call this function in |
| 4315 | * their &drm_encoder_helper_funcs.atomic_check() callback unconditionally to |
| 4316 | * change the current time slot allocation for the new state, and ensure the MST |
| 4317 | * atomic state is added whenever the state of payloads in the topology changes. |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4318 | * |
| 4319 | * Allocations set by this function are not checked against the bandwidth |
| 4320 | * restraints of @mgr until the driver calls drm_dp_mst_atomic_check(). |
| 4321 | * |
| 4322 | * Additionally, it is OK to call this function multiple times on the same |
| 4323 | * @port as needed. It is not OK however, to call this function and |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4324 | * drm_dp_atomic_release_time_slots() in the same atomic check phase. |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4325 | * |
| 4326 | * See also: |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4327 | * drm_dp_atomic_release_time_slots() |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4328 | * drm_dp_mst_atomic_check() |
| 4329 | * |
| 4330 | * Returns: |
| 4331 | * Total slots in the atomic state assigned for this port, or a negative error |
| 4332 | * code if the port no longer exists |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4333 | */ |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4334 | int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state, |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4335 | struct drm_dp_mst_topology_mgr *mgr, |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4336 | struct drm_dp_mst_port *port, int pbn) |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4337 | { |
| 4338 | struct drm_dp_mst_topology_state *topology_state; |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 4339 | struct drm_dp_mst_atomic_payload *payload = NULL; |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 4340 | struct drm_connector_state *conn_state; |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 4341 | int prev_slots = 0, prev_bw = 0, req_slots; |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4342 | |
| 4343 | topology_state = drm_atomic_get_mst_topology_state(state, mgr); |
Ville Syrjälä | 56a91c4 | 2017-07-12 18:51:00 +0300 | [diff] [blame] | 4344 | if (IS_ERR(topology_state)) |
| 4345 | return PTR_ERR(topology_state); |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4346 | |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 4347 | conn_state = drm_atomic_get_new_connector_state(state, port->connector); |
| 4348 | topology_state->pending_crtc_mask |= drm_crtc_mask(conn_state->crtc); |
| 4349 | |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4350 | /* Find the current allocation for this port, if any */ |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 4351 | payload = drm_atomic_get_mst_payload_state(topology_state, port); |
| 4352 | if (payload) { |
| 4353 | prev_slots = payload->time_slots; |
| 4354 | prev_bw = payload->pbn; |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4355 | |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 4356 | /* |
| 4357 | * This should never happen, unless the driver tries |
| 4358 | * releasing and allocating the same timeslot allocation, |
| 4359 | * which is an error |
| 4360 | */ |
Lyude Paul | 6366fc7 | 2022-08-17 15:38:44 -0400 | [diff] [blame] | 4361 | if (drm_WARN_ON(mgr->dev, payload->delete)) { |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 4362 | drm_err(mgr->dev, |
| 4363 | "cannot allocate and release time slots on [MST PORT:%p] in the same state\n", |
| 4364 | port); |
| 4365 | return -EINVAL; |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4366 | } |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4367 | } |
| 4368 | |
Imre Deak | d389989 | 2023-11-17 17:09:27 +0200 | [diff] [blame] | 4369 | req_slots = DIV_ROUND_UP(dfixed_const(pbn), topology_state->pbn_div.full); |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4370 | |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4371 | drm_dbg_atomic(mgr->dev, "[CONNECTOR:%d:%s] [MST PORT:%p] TU %d -> %d\n", |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4372 | port->connector->base.id, port->connector->name, |
| 4373 | port, prev_slots, req_slots); |
| 4374 | drm_dbg_atomic(mgr->dev, "[CONNECTOR:%d:%s] [MST PORT:%p] PBN %d -> %d\n", |
| 4375 | port->connector->base.id, port->connector->name, |
| 4376 | port, prev_bw, pbn); |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4377 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4378 | /* Add the new allocation to the state, note the VCPI isn't assigned until the end */ |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 4379 | if (!payload) { |
| 4380 | payload = kzalloc(sizeof(*payload), GFP_KERNEL); |
| 4381 | if (!payload) |
Lyude Paul | a3d15c4 | 2019-02-01 19:20:02 -0500 | [diff] [blame] | 4382 | return -ENOMEM; |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4383 | |
| 4384 | drm_dp_mst_get_port_malloc(port); |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 4385 | payload->port = port; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4386 | payload->vc_start_slot = -1; |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 4387 | payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_NONE; |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 4388 | list_add(&payload->next, &topology_state->payloads); |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4389 | } |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4390 | payload->time_slots = req_slots; |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 4391 | payload->pbn = pbn; |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4392 | |
Wambui Karuga | ddd9b54 | 2019-10-19 10:18:40 +0300 | [diff] [blame] | 4393 | return req_slots; |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4394 | } |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4395 | EXPORT_SYMBOL(drm_dp_atomic_find_time_slots); |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4396 | |
| 4397 | /** |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4398 | * drm_dp_atomic_release_time_slots() - Release allocated time slots |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4399 | * @state: global atomic state |
| 4400 | * @mgr: MST topology manager for the port |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4401 | * @port: The port to release the time slots from |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4402 | * |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4403 | * Releases any time slots that have been allocated to a port in the atomic |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4404 | * state. Any atomic drivers which support MST must call this function |
| 4405 | * unconditionally in their &drm_connector_helper_funcs.atomic_check() callback. |
| 4406 | * This helper will check whether time slots would be released by the new state and |
| 4407 | * respond accordingly, along with ensuring the MST state is always added to the |
| 4408 | * atomic state whenever a new state would modify the state of payloads on the |
| 4409 | * topology. |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4410 | * |
| 4411 | * It is OK to call this even if @port has been removed from the system. |
| 4412 | * Additionally, it is OK to call this function multiple times on the same |
| 4413 | * @port as needed. It is not OK however, to call this function and |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4414 | * drm_dp_atomic_find_time_slots() on the same @port in a single atomic check |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4415 | * phase. |
| 4416 | * |
| 4417 | * See also: |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4418 | * drm_dp_atomic_find_time_slots() |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4419 | * drm_dp_mst_atomic_check() |
| 4420 | * |
| 4421 | * Returns: |
Lyude Paul | 946c701 | 2022-08-17 15:38:34 -0400 | [diff] [blame] | 4422 | * 0 on success, negative error code otherwise |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4423 | */ |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4424 | int drm_dp_atomic_release_time_slots(struct drm_atomic_state *state, |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4425 | struct drm_dp_mst_topology_mgr *mgr, |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4426 | struct drm_dp_mst_port *port) |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4427 | { |
| 4428 | struct drm_dp_mst_topology_state *topology_state; |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 4429 | struct drm_dp_mst_atomic_payload *payload; |
Lyude Paul | ffac972 | 2022-08-17 15:38:38 -0400 | [diff] [blame] | 4430 | struct drm_connector_state *old_conn_state, *new_conn_state; |
Lyude Paul | 083351e | 2022-08-17 15:38:39 -0400 | [diff] [blame] | 4431 | bool update_payload = true; |
Lyude Paul | ffac972 | 2022-08-17 15:38:38 -0400 | [diff] [blame] | 4432 | |
| 4433 | old_conn_state = drm_atomic_get_old_connector_state(state, port->connector); |
| 4434 | if (!old_conn_state->crtc) |
| 4435 | return 0; |
| 4436 | |
| 4437 | /* If the CRTC isn't disabled by this state, don't release it's payload */ |
| 4438 | new_conn_state = drm_atomic_get_new_connector_state(state, port->connector); |
| 4439 | if (new_conn_state->crtc) { |
| 4440 | struct drm_crtc_state *crtc_state = |
| 4441 | drm_atomic_get_new_crtc_state(state, new_conn_state->crtc); |
| 4442 | |
Lyude Paul | 083351e | 2022-08-17 15:38:39 -0400 | [diff] [blame] | 4443 | /* No modeset means no payload changes, so it's safe to not pull in the MST state */ |
| 4444 | if (!crtc_state || !drm_atomic_crtc_needs_modeset(crtc_state)) |
Lyude Paul | ffac972 | 2022-08-17 15:38:38 -0400 | [diff] [blame] | 4445 | return 0; |
Lyude Paul | 083351e | 2022-08-17 15:38:39 -0400 | [diff] [blame] | 4446 | |
| 4447 | if (!crtc_state->mode_changed && !crtc_state->connectors_changed) |
| 4448 | update_payload = false; |
Lyude Paul | ffac972 | 2022-08-17 15:38:38 -0400 | [diff] [blame] | 4449 | } |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4450 | |
| 4451 | topology_state = drm_atomic_get_mst_topology_state(state, mgr); |
Ville Syrjälä | 56a91c4 | 2017-07-12 18:51:00 +0300 | [diff] [blame] | 4452 | if (IS_ERR(topology_state)) |
| 4453 | return PTR_ERR(topology_state); |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4454 | |
Lyude Paul | ffac972 | 2022-08-17 15:38:38 -0400 | [diff] [blame] | 4455 | topology_state->pending_crtc_mask |= drm_crtc_mask(old_conn_state->crtc); |
Lyude Paul | 083351e | 2022-08-17 15:38:39 -0400 | [diff] [blame] | 4456 | if (!update_payload) |
| 4457 | return 0; |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 4458 | |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 4459 | payload = drm_atomic_get_mst_payload_state(topology_state, port); |
| 4460 | if (WARN_ON(!payload)) { |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 4461 | drm_err(mgr->dev, "No payload for [MST PORT:%p] found in mst state %p\n", |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4462 | port, &topology_state->base); |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4463 | return -EINVAL; |
| 4464 | } |
| 4465 | |
Imre Deak | 5d832b6 | 2022-09-07 17:25:42 +0300 | [diff] [blame] | 4466 | if (new_conn_state->crtc) |
| 4467 | return 0; |
| 4468 | |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 4469 | drm_dbg_atomic(mgr->dev, "[MST PORT:%p] TU %d -> 0\n", port, payload->time_slots); |
Lyude Paul | 6366fc7 | 2022-08-17 15:38:44 -0400 | [diff] [blame] | 4470 | if (!payload->delete) { |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 4471 | payload->pbn = 0; |
Lyude Paul | 6366fc7 | 2022-08-17 15:38:44 -0400 | [diff] [blame] | 4472 | payload->delete = true; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4473 | topology_state->payload_mask &= ~BIT(payload->vcpi - 1); |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 4474 | } |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4475 | |
| 4476 | return 0; |
| 4477 | } |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 4478 | EXPORT_SYMBOL(drm_dp_atomic_release_time_slots); |
Pandiyan, Dhinakaran | edb1ed1 | 2017-04-20 22:51:32 -0700 | [diff] [blame] | 4479 | |
| 4480 | /** |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 4481 | * drm_dp_mst_atomic_setup_commit() - setup_commit hook for MST helpers |
| 4482 | * @state: global atomic state |
| 4483 | * |
| 4484 | * This function saves all of the &drm_crtc_commit structs in an atomic state that touch any CRTCs |
| 4485 | * currently assigned to an MST topology. Drivers must call this hook from their |
| 4486 | * &drm_mode_config_helper_funcs.atomic_commit_setup hook. |
| 4487 | * |
| 4488 | * Returns: |
| 4489 | * 0 if all CRTC commits were retrieved successfully, negative error code otherwise |
| 4490 | */ |
| 4491 | int drm_dp_mst_atomic_setup_commit(struct drm_atomic_state *state) |
| 4492 | { |
| 4493 | struct drm_dp_mst_topology_mgr *mgr; |
| 4494 | struct drm_dp_mst_topology_state *mst_state; |
| 4495 | struct drm_crtc *crtc; |
| 4496 | struct drm_crtc_state *crtc_state; |
| 4497 | int i, j, commit_idx, num_commit_deps; |
| 4498 | |
| 4499 | for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) { |
| 4500 | if (!mst_state->pending_crtc_mask) |
| 4501 | continue; |
| 4502 | |
| 4503 | num_commit_deps = hweight32(mst_state->pending_crtc_mask); |
| 4504 | mst_state->commit_deps = kmalloc_array(num_commit_deps, |
| 4505 | sizeof(*mst_state->commit_deps), GFP_KERNEL); |
| 4506 | if (!mst_state->commit_deps) |
| 4507 | return -ENOMEM; |
| 4508 | mst_state->num_commit_deps = num_commit_deps; |
| 4509 | |
| 4510 | commit_idx = 0; |
| 4511 | for_each_new_crtc_in_state(state, crtc, crtc_state, j) { |
| 4512 | if (mst_state->pending_crtc_mask & drm_crtc_mask(crtc)) { |
| 4513 | mst_state->commit_deps[commit_idx++] = |
| 4514 | drm_crtc_commit_get(crtc_state->commit); |
| 4515 | } |
| 4516 | } |
| 4517 | } |
| 4518 | |
| 4519 | return 0; |
| 4520 | } |
| 4521 | EXPORT_SYMBOL(drm_dp_mst_atomic_setup_commit); |
| 4522 | |
| 4523 | /** |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4524 | * drm_dp_mst_atomic_wait_for_dependencies() - Wait for all pending commits on MST topologies, |
| 4525 | * prepare new MST state for commit |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 4526 | * @state: global atomic state |
| 4527 | * |
| 4528 | * Goes through any MST topologies in this atomic state, and waits for any pending commits which |
| 4529 | * touched CRTCs that were/are on an MST topology to be programmed to hardware and flipped to before |
| 4530 | * returning. This is to prevent multiple non-blocking commits affecting an MST topology from racing |
| 4531 | * with eachother by forcing them to be executed sequentially in situations where the only resources |
| 4532 | * the modeset objects in these commits share are an MST topology. |
| 4533 | * |
| 4534 | * This function also prepares the new MST state for commit by performing some state preparation |
| 4535 | * which can't be done until this point, such as reading back the final VC start slots (which are |
| 4536 | * determined at commit-time) from the previous state. |
| 4537 | * |
| 4538 | * All MST drivers must call this function after calling drm_atomic_helper_wait_for_dependencies(), |
| 4539 | * or whatever their equivalent of that is. |
| 4540 | */ |
| 4541 | void drm_dp_mst_atomic_wait_for_dependencies(struct drm_atomic_state *state) |
| 4542 | { |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4543 | struct drm_dp_mst_topology_state *old_mst_state, *new_mst_state; |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 4544 | struct drm_dp_mst_topology_mgr *mgr; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4545 | struct drm_dp_mst_atomic_payload *old_payload, *new_payload; |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 4546 | int i, j, ret; |
| 4547 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4548 | for_each_oldnew_mst_mgr_in_state(state, mgr, old_mst_state, new_mst_state, i) { |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 4549 | for (j = 0; j < old_mst_state->num_commit_deps; j++) { |
| 4550 | ret = drm_crtc_commit_wait(old_mst_state->commit_deps[j]); |
| 4551 | if (ret < 0) |
| 4552 | drm_err(state->dev, "Failed to wait for %s: %d\n", |
| 4553 | old_mst_state->commit_deps[j]->crtc->name, ret); |
| 4554 | } |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4555 | |
| 4556 | /* Now that previous state is committed, it's safe to copy over the start slot |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 4557 | * and allocation status assignments |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4558 | */ |
| 4559 | list_for_each_entry(old_payload, &old_mst_state->payloads, next) { |
| 4560 | if (old_payload->delete) |
| 4561 | continue; |
| 4562 | |
| 4563 | new_payload = drm_atomic_get_mst_payload_state(new_mst_state, |
| 4564 | old_payload->port); |
| 4565 | new_payload->vc_start_slot = old_payload->vc_start_slot; |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 4566 | new_payload->payload_allocation_status = |
| 4567 | old_payload->payload_allocation_status; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4568 | } |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 4569 | } |
| 4570 | } |
| 4571 | EXPORT_SYMBOL(drm_dp_mst_atomic_wait_for_dependencies); |
| 4572 | |
| 4573 | /** |
Lyude Paul | a76eb42 | 2022-08-17 15:38:42 -0400 | [diff] [blame] | 4574 | * drm_dp_mst_root_conn_atomic_check() - Serialize CRTC commits on MST-capable connectors operating |
| 4575 | * in SST mode |
| 4576 | * @new_conn_state: The new connector state of the &drm_connector |
| 4577 | * @mgr: The MST topology manager for the &drm_connector |
| 4578 | * |
| 4579 | * Since MST uses fake &drm_encoder structs, the generic atomic modesetting code isn't able to |
| 4580 | * serialize non-blocking commits happening on the real DP connector of an MST topology switching |
| 4581 | * into/away from MST mode - as the CRTC on the real DP connector and the CRTCs on the connector's |
| 4582 | * MST topology will never share the same &drm_encoder. |
| 4583 | * |
| 4584 | * This function takes care of this serialization issue, by checking a root MST connector's atomic |
| 4585 | * state to determine if it is about to have a modeset - and then pulling in the MST topology state |
| 4586 | * if so, along with adding any relevant CRTCs to &drm_dp_mst_topology_state.pending_crtc_mask. |
| 4587 | * |
| 4588 | * Drivers implementing MST must call this function from the |
| 4589 | * &drm_connector_helper_funcs.atomic_check hook of any physical DP &drm_connector capable of |
| 4590 | * driving MST sinks. |
| 4591 | * |
| 4592 | * Returns: |
| 4593 | * 0 on success, negative error code otherwise |
| 4594 | */ |
| 4595 | int drm_dp_mst_root_conn_atomic_check(struct drm_connector_state *new_conn_state, |
| 4596 | struct drm_dp_mst_topology_mgr *mgr) |
| 4597 | { |
| 4598 | struct drm_atomic_state *state = new_conn_state->state; |
| 4599 | struct drm_connector_state *old_conn_state = |
| 4600 | drm_atomic_get_old_connector_state(state, new_conn_state->connector); |
| 4601 | struct drm_crtc_state *crtc_state; |
| 4602 | struct drm_dp_mst_topology_state *mst_state = NULL; |
| 4603 | |
| 4604 | if (new_conn_state->crtc) { |
| 4605 | crtc_state = drm_atomic_get_new_crtc_state(state, new_conn_state->crtc); |
| 4606 | if (crtc_state && drm_atomic_crtc_needs_modeset(crtc_state)) { |
| 4607 | mst_state = drm_atomic_get_mst_topology_state(state, mgr); |
| 4608 | if (IS_ERR(mst_state)) |
| 4609 | return PTR_ERR(mst_state); |
| 4610 | |
| 4611 | mst_state->pending_crtc_mask |= drm_crtc_mask(new_conn_state->crtc); |
| 4612 | } |
| 4613 | } |
| 4614 | |
| 4615 | if (old_conn_state->crtc) { |
| 4616 | crtc_state = drm_atomic_get_new_crtc_state(state, old_conn_state->crtc); |
| 4617 | if (crtc_state && drm_atomic_crtc_needs_modeset(crtc_state)) { |
| 4618 | if (!mst_state) { |
| 4619 | mst_state = drm_atomic_get_mst_topology_state(state, mgr); |
| 4620 | if (IS_ERR(mst_state)) |
| 4621 | return PTR_ERR(mst_state); |
| 4622 | } |
| 4623 | |
| 4624 | mst_state->pending_crtc_mask |= drm_crtc_mask(old_conn_state->crtc); |
| 4625 | } |
| 4626 | } |
| 4627 | |
| 4628 | return 0; |
| 4629 | } |
| 4630 | EXPORT_SYMBOL(drm_dp_mst_root_conn_atomic_check); |
| 4631 | |
| 4632 | /** |
Bhawanpreet Lakha | d6c6a76 | 2021-10-25 18:38:22 -0400 | [diff] [blame] | 4633 | * drm_dp_mst_update_slots() - updates the slot info depending on the DP ecoding format |
| 4634 | * @mst_state: mst_state to update |
| 4635 | * @link_encoding_cap: the ecoding format on the link |
| 4636 | */ |
| 4637 | void drm_dp_mst_update_slots(struct drm_dp_mst_topology_state *mst_state, uint8_t link_encoding_cap) |
| 4638 | { |
| 4639 | if (link_encoding_cap == DP_CAP_ANSI_128B132B) { |
| 4640 | mst_state->total_avail_slots = 64; |
| 4641 | mst_state->start_slot = 0; |
| 4642 | } else { |
| 4643 | mst_state->total_avail_slots = 63; |
| 4644 | mst_state->start_slot = 1; |
| 4645 | } |
| 4646 | |
| 4647 | DRM_DEBUG_KMS("%s encoding format on mst_state 0x%p\n", |
| 4648 | (link_encoding_cap == DP_CAP_ANSI_128B132B) ? "128b/132b":"8b/10b", |
| 4649 | mst_state); |
| 4650 | } |
| 4651 | EXPORT_SYMBOL(drm_dp_mst_update_slots); |
| 4652 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4653 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4654 | int id, u8 start_slot, u8 num_slots) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4655 | { |
| 4656 | u8 payload_alloc[3], status; |
| 4657 | int ret; |
| 4658 | int retries = 0; |
| 4659 | |
| 4660 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, |
| 4661 | DP_PAYLOAD_TABLE_UPDATED); |
| 4662 | |
| 4663 | payload_alloc[0] = id; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4664 | payload_alloc[1] = start_slot; |
| 4665 | payload_alloc[2] = num_slots; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4666 | |
| 4667 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); |
| 4668 | if (ret != 3) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4669 | drm_dbg_kms(mgr->dev, "failed to write payload allocation %d\n", ret); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4670 | goto fail; |
| 4671 | } |
| 4672 | |
| 4673 | retry: |
| 4674 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); |
| 4675 | if (ret < 0) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4676 | drm_dbg_kms(mgr->dev, "failed to read payload table status %d\n", ret); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4677 | goto fail; |
| 4678 | } |
| 4679 | |
| 4680 | if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { |
| 4681 | retries++; |
| 4682 | if (retries < 20) { |
| 4683 | usleep_range(10000, 20000); |
| 4684 | goto retry; |
| 4685 | } |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4686 | drm_dbg_kms(mgr->dev, "status not set after read payload table status %d\n", |
| 4687 | status); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4688 | ret = -EINVAL; |
| 4689 | goto fail; |
| 4690 | } |
| 4691 | ret = 0; |
| 4692 | fail: |
| 4693 | return ret; |
| 4694 | } |
| 4695 | |
Lyude Paul | 873a95e | 2020-04-03 15:47:15 -0400 | [diff] [blame] | 4696 | static int do_get_act_status(struct drm_dp_aux *aux) |
| 4697 | { |
| 4698 | int ret; |
| 4699 | u8 status; |
| 4700 | |
| 4701 | ret = drm_dp_dpcd_readb(aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); |
| 4702 | if (ret < 0) |
| 4703 | return ret; |
| 4704 | |
| 4705 | return status; |
| 4706 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4707 | |
| 4708 | /** |
Lyude Paul | 17e03aa | 2020-04-03 14:11:46 -0400 | [diff] [blame] | 4709 | * drm_dp_check_act_status() - Polls for ACT handled status. |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4710 | * @mgr: manager to use |
| 4711 | * |
Lyude Paul | 17e03aa | 2020-04-03 14:11:46 -0400 | [diff] [blame] | 4712 | * Tries waiting for the MST hub to finish updating it's payload table by |
Lyude Paul | 873a95e | 2020-04-03 15:47:15 -0400 | [diff] [blame] | 4713 | * polling for the ACT handled bit for up to 3 seconds (yes-some hubs really |
| 4714 | * take that long). |
Lyude Paul | 17e03aa | 2020-04-03 14:11:46 -0400 | [diff] [blame] | 4715 | * |
| 4716 | * Returns: |
| 4717 | * 0 if the ACT was handled in time, negative error code on failure. |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4718 | */ |
| 4719 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) |
| 4720 | { |
Lyude Paul | 873a95e | 2020-04-03 15:47:15 -0400 | [diff] [blame] | 4721 | /* |
| 4722 | * There doesn't seem to be any recommended retry count or timeout in |
| 4723 | * the MST specification. Since some hubs have been observed to take |
| 4724 | * over 1 second to update their payload allocations under certain |
| 4725 | * conditions, we use a rather large timeout value. |
| 4726 | */ |
| 4727 | const int timeout_ms = 3000; |
| 4728 | int ret, status; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4729 | |
Lyude Paul | 873a95e | 2020-04-03 15:47:15 -0400 | [diff] [blame] | 4730 | ret = readx_poll_timeout(do_get_act_status, mgr->aux, status, |
| 4731 | status & DP_PAYLOAD_ACT_HANDLED || status < 0, |
| 4732 | 200, timeout_ms * USEC_PER_MSEC); |
| 4733 | if (ret < 0 && status >= 0) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4734 | drm_err(mgr->dev, "Failed to get ACT after %dms, last status: %02x\n", |
| 4735 | timeout_ms, status); |
Lyude Paul | a5cb5fa | 2020-04-03 14:08:32 -0400 | [diff] [blame] | 4736 | return -EINVAL; |
Lyude Paul | 873a95e | 2020-04-03 15:47:15 -0400 | [diff] [blame] | 4737 | } else if (status < 0) { |
Lyude Paul | 4d1b58d | 2020-04-03 15:58:29 -0400 | [diff] [blame] | 4738 | /* |
| 4739 | * Failure here isn't unexpected - the hub may have |
| 4740 | * just been unplugged |
| 4741 | */ |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 4742 | drm_dbg_kms(mgr->dev, "Failed to read payload table status: %d\n", status); |
Lyude Paul | 873a95e | 2020-04-03 15:47:15 -0400 | [diff] [blame] | 4743 | return status; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4744 | } |
Lyude Paul | 873a95e | 2020-04-03 15:47:15 -0400 | [diff] [blame] | 4745 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4746 | return 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4747 | } |
| 4748 | EXPORT_SYMBOL(drm_dp_check_act_status); |
| 4749 | |
| 4750 | /** |
| 4751 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. |
Ville Syrjälä | 7707dd6 | 2023-10-24 04:08:57 +0300 | [diff] [blame] | 4752 | * @clock: dot clock |
| 4753 | * @bpp: bpp as .4 binary fixed point |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4754 | * |
| 4755 | * This uses the formula in the spec to calculate the PBN value for a mode. |
| 4756 | */ |
Ville Syrjälä | 7707dd6 | 2023-10-24 04:08:57 +0300 | [diff] [blame] | 4757 | int drm_dp_calc_pbn_mode(int clock, int bpp) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4758 | { |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 4759 | /* |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 4760 | * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on |
| 4761 | * common multiplier to render an integer PBN for all link rate/lane |
| 4762 | * counts combinations |
| 4763 | * calculate |
Imre Deak | c1d6a22b | 2023-10-24 13:22:17 +0300 | [diff] [blame] | 4764 | * peak_kbps = clock * bpp / 16 |
| 4765 | * peak_kbps *= SSC overhead / 1000000 |
| 4766 | * peak_kbps /= 8 convert to Kbytes |
| 4767 | * peak_kBps *= (64/54) / 1000 convert to PBN |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 4768 | */ |
Imre Deak | c1d6a22b | 2023-10-24 13:22:17 +0300 | [diff] [blame] | 4769 | /* |
| 4770 | * TODO: Use the actual link and mode parameters to calculate |
| 4771 | * the overhead. For now it's assumed that these are |
| 4772 | * 4 link lanes, 4096 hactive pixels, which don't add any |
| 4773 | * significant data padding overhead and that there is no DSC |
| 4774 | * or FEC overhead. |
| 4775 | */ |
| 4776 | int overhead = drm_dp_bw_overhead(4, 4096, 0, bpp, |
| 4777 | DRM_DP_BW_OVERHEAD_MST | |
| 4778 | DRM_DP_BW_OVERHEAD_SSC_REF_CLK); |
David Francis | dc48529 | 2019-08-21 10:33:26 -0400 | [diff] [blame] | 4779 | |
Imre Deak | c1d6a22b | 2023-10-24 13:22:17 +0300 | [diff] [blame] | 4780 | return DIV64_U64_ROUND_UP(mul_u32_u32(clock * bpp, 64 * overhead >> 4), |
| 4781 | 1000000ULL * 8 * 54 * 1000); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4782 | } |
| 4783 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); |
| 4784 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4785 | /* we want to kick the TX after we've ack the up/down IRQs. */ |
| 4786 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) |
| 4787 | { |
| 4788 | queue_work(system_long_wq, &mgr->tx_work); |
| 4789 | } |
| 4790 | |
Eryk Brol | e55f2ff | 2021-03-25 14:06:14 -0400 | [diff] [blame] | 4791 | /* |
| 4792 | * Helper function for parsing DP device types into convenient strings |
| 4793 | * for use with dp_mst_topology |
| 4794 | */ |
| 4795 | static const char *pdt_to_string(u8 pdt) |
| 4796 | { |
| 4797 | switch (pdt) { |
| 4798 | case DP_PEER_DEVICE_NONE: |
| 4799 | return "NONE"; |
| 4800 | case DP_PEER_DEVICE_SOURCE_OR_SST: |
| 4801 | return "SOURCE OR SST"; |
| 4802 | case DP_PEER_DEVICE_MST_BRANCHING: |
| 4803 | return "MST BRANCHING"; |
| 4804 | case DP_PEER_DEVICE_SST_SINK: |
| 4805 | return "SST SINK"; |
| 4806 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
| 4807 | return "DP LEGACY CONV"; |
| 4808 | default: |
| 4809 | return "ERR"; |
| 4810 | } |
| 4811 | } |
| 4812 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4813 | static void drm_dp_mst_dump_mstb(struct seq_file *m, |
| 4814 | struct drm_dp_mst_branch *mstb) |
| 4815 | { |
| 4816 | struct drm_dp_mst_port *port; |
| 4817 | int tabs = mstb->lct; |
| 4818 | char prefix[10]; |
| 4819 | int i; |
| 4820 | |
| 4821 | for (i = 0; i < tabs; i++) |
| 4822 | prefix[i] = '\t'; |
| 4823 | prefix[i] = '\0'; |
| 4824 | |
Eryk Brol | e55f2ff | 2021-03-25 14:06:14 -0400 | [diff] [blame] | 4825 | seq_printf(m, "%smstb - [%p]: num_ports: %d\n", prefix, mstb, mstb->num_ports); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4826 | list_for_each_entry(port, &mstb->ports, next) { |
Thomas Zimmermann | dfacce5 | 2022-01-14 12:45:31 +0100 | [diff] [blame] | 4827 | seq_printf(m, "%sport %d - [%p] (%s - %s): ddps: %d, ldps: %d, sdp: %d/%d, fec: %s, conn: %p\n", |
Eryk Brol | e55f2ff | 2021-03-25 14:06:14 -0400 | [diff] [blame] | 4828 | prefix, |
| 4829 | port->port_num, |
| 4830 | port, |
| 4831 | port->input ? "input" : "output", |
| 4832 | pdt_to_string(port->pdt), |
| 4833 | port->ddps, |
| 4834 | port->ldps, |
| 4835 | port->num_sdp_streams, |
| 4836 | port->num_sdp_stream_sinks, |
| 4837 | port->fec_capable ? "true" : "false", |
| 4838 | port->connector); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4839 | if (port->mstb) |
| 4840 | drm_dp_mst_dump_mstb(m, port->mstb); |
| 4841 | } |
| 4842 | } |
| 4843 | |
Andy Shevchenko | 7056a2b | 2018-03-19 16:19:32 +0200 | [diff] [blame] | 4844 | #define DP_PAYLOAD_TABLE_SIZE 64 |
| 4845 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4846 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
| 4847 | char *buf) |
| 4848 | { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4849 | int i; |
Joe Perches | 46466b0 | 2017-05-30 16:35:37 -0700 | [diff] [blame] | 4850 | |
Andy Shevchenko | 7056a2b | 2018-03-19 16:19:32 +0200 | [diff] [blame] | 4851 | for (i = 0; i < DP_PAYLOAD_TABLE_SIZE; i += 16) { |
Joe Perches | 46466b0 | 2017-05-30 16:35:37 -0700 | [diff] [blame] | 4852 | if (drm_dp_dpcd_read(mgr->aux, |
| 4853 | DP_PAYLOAD_TABLE_UPDATE_STATUS + i, |
| 4854 | &buf[i], 16) != 16) |
| 4855 | return false; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4856 | } |
Joe Perches | 46466b0 | 2017-05-30 16:35:37 -0700 | [diff] [blame] | 4857 | return true; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4858 | } |
| 4859 | |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 4860 | static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr, |
| 4861 | struct drm_dp_mst_port *port, char *name, |
| 4862 | int namelen) |
| 4863 | { |
| 4864 | struct edid *mst_edid; |
| 4865 | |
| 4866 | mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port); |
| 4867 | drm_edid_get_monitor_name(mst_edid, name, namelen); |
Hangyu Hua | 6e03b13 | 2022-05-16 11:20:42 +0800 | [diff] [blame] | 4868 | kfree(mst_edid); |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 4869 | } |
| 4870 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4871 | /** |
| 4872 | * drm_dp_mst_dump_topology(): dump topology to seq file. |
| 4873 | * @m: seq_file to dump output to |
| 4874 | * @mgr: manager to dump current topology for. |
| 4875 | * |
| 4876 | * helper to dump MST topology to a seq file for debugfs. |
| 4877 | */ |
| 4878 | void drm_dp_mst_dump_topology(struct seq_file *m, |
| 4879 | struct drm_dp_mst_topology_mgr *mgr) |
| 4880 | { |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4881 | struct drm_dp_mst_topology_state *state; |
| 4882 | struct drm_dp_mst_atomic_payload *payload; |
| 4883 | int i, ret; |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 4884 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 4885 | static const char *const status[] = { |
| 4886 | "None", |
| 4887 | "Local", |
| 4888 | "DFP", |
| 4889 | "Remote", |
| 4890 | }; |
| 4891 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4892 | mutex_lock(&mgr->lock); |
| 4893 | if (mgr->mst_primary) |
| 4894 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); |
| 4895 | |
| 4896 | /* dump VCPIs */ |
| 4897 | mutex_unlock(&mgr->lock); |
| 4898 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4899 | ret = drm_modeset_lock_single_interruptible(&mgr->base.lock); |
| 4900 | if (ret < 0) |
| 4901 | return; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4902 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4903 | state = to_drm_dp_mst_topology_state(mgr->base.state); |
| 4904 | seq_printf(m, "\n*** Atomic state info ***\n"); |
| 4905 | seq_printf(m, "payload_mask: %x, max_payloads: %d, start_slot: %u, pbn_div: %d\n", |
Imre Deak | 191dc43 | 2023-11-16 15:18:31 +0200 | [diff] [blame] | 4906 | state->payload_mask, mgr->max_payloads, state->start_slot, |
| 4907 | dfixed_trunc(state->pbn_div)); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4908 | |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 4909 | seq_printf(m, "\n| idx | port | vcpi | slots | pbn | dsc | status | sink name |\n"); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4910 | for (i = 0; i < mgr->max_payloads; i++) { |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4911 | list_for_each_entry(payload, &state->payloads, next) { |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 4912 | char name[14]; |
| 4913 | |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4914 | if (payload->vcpi != i || payload->delete) |
| 4915 | continue; |
| 4916 | |
| 4917 | fetch_monitor_name(mgr, payload->port, name, sizeof(name)); |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 4918 | seq_printf(m, " %5d %6d %6d %02d - %02d %5d %5s %8s %19s\n", |
Eryk Brol | e55f2ff | 2021-03-25 14:06:14 -0400 | [diff] [blame] | 4919 | i, |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4920 | payload->port->port_num, |
| 4921 | payload->vcpi, |
| 4922 | payload->vc_start_slot, |
| 4923 | payload->vc_start_slot + payload->time_slots - 1, |
| 4924 | payload->pbn, |
| 4925 | payload->dsc_enabled ? "Y" : "N", |
Wayne Lin | 5aa1dfc | 2023-08-07 10:56:38 +0800 | [diff] [blame] | 4926 | status[payload->payload_allocation_status], |
Eryk Brol | e55f2ff | 2021-03-25 14:06:14 -0400 | [diff] [blame] | 4927 | (*name != 0) ? name : "Unknown"); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4928 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4929 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4930 | |
Eryk Brol | e55f2ff | 2021-03-25 14:06:14 -0400 | [diff] [blame] | 4931 | seq_printf(m, "\n*** DPCD Info ***\n"); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4932 | mutex_lock(&mgr->lock); |
| 4933 | if (mgr->mst_primary) { |
Andy Shevchenko | 7056a2b | 2018-03-19 16:19:32 +0200 | [diff] [blame] | 4934 | u8 buf[DP_PAYLOAD_TABLE_SIZE]; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4935 | int ret; |
Joe Perches | 46466b0 | 2017-05-30 16:35:37 -0700 | [diff] [blame] | 4936 | |
Imre Deak | 7a710a8 | 2022-06-14 12:45:37 +0300 | [diff] [blame] | 4937 | if (drm_dp_read_dpcd_caps(mgr->aux, buf) < 0) { |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 4938 | seq_printf(m, "dpcd read failed\n"); |
| 4939 | goto out; |
| 4940 | } |
Joe Perches | 46466b0 | 2017-05-30 16:35:37 -0700 | [diff] [blame] | 4941 | seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf); |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 4942 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4943 | ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); |
Simon Ser | 2ac6cdd | 2022-02-10 15:40:25 +0000 | [diff] [blame] | 4944 | if (ret != 2) { |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 4945 | seq_printf(m, "faux/mst read failed\n"); |
| 4946 | goto out; |
| 4947 | } |
Joe Perches | 46466b0 | 2017-05-30 16:35:37 -0700 | [diff] [blame] | 4948 | seq_printf(m, "faux/mst: %*ph\n", 2, buf); |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 4949 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4950 | ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); |
Simon Ser | 2ac6cdd | 2022-02-10 15:40:25 +0000 | [diff] [blame] | 4951 | if (ret != 1) { |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 4952 | seq_printf(m, "mst ctrl read failed\n"); |
| 4953 | goto out; |
| 4954 | } |
Joe Perches | 46466b0 | 2017-05-30 16:35:37 -0700 | [diff] [blame] | 4955 | seq_printf(m, "mst ctrl: %*ph\n", 1, buf); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4956 | |
Dave Airlie | 4479046 | 2015-07-14 11:33:31 +1000 | [diff] [blame] | 4957 | /* dump the standard OUI branch header */ |
| 4958 | ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); |
Simon Ser | 2ac6cdd | 2022-02-10 15:40:25 +0000 | [diff] [blame] | 4959 | if (ret != DP_BRANCH_OUI_HEADER_SIZE) { |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 4960 | seq_printf(m, "branch oui read failed\n"); |
| 4961 | goto out; |
| 4962 | } |
Joe Perches | 46466b0 | 2017-05-30 16:35:37 -0700 | [diff] [blame] | 4963 | seq_printf(m, "branch oui: %*phN devid: ", 3, buf); |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 4964 | |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 4965 | for (i = 0x3; i < 0x8 && buf[i]; i++) |
Dave Airlie | 4479046 | 2015-07-14 11:33:31 +1000 | [diff] [blame] | 4966 | seq_printf(m, "%c", buf[i]); |
Joe Perches | 46466b0 | 2017-05-30 16:35:37 -0700 | [diff] [blame] | 4967 | seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n", |
| 4968 | buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); |
| 4969 | if (dump_dp_payload_table(mgr, buf)) |
Andy Shevchenko | 7056a2b | 2018-03-19 16:19:32 +0200 | [diff] [blame] | 4970 | seq_printf(m, "payload table: %*ph\n", DP_PAYLOAD_TABLE_SIZE, buf); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4971 | } |
| 4972 | |
Benjamin Gaignard | cb89754 | 2020-02-05 09:48:42 +0100 | [diff] [blame] | 4973 | out: |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4974 | mutex_unlock(&mgr->lock); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 4975 | drm_modeset_unlock(&mgr->base.lock); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4976 | } |
| 4977 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); |
| 4978 | |
| 4979 | static void drm_dp_tx_work(struct work_struct *work) |
| 4980 | { |
| 4981 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); |
| 4982 | |
| 4983 | mutex_lock(&mgr->qlock); |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 4984 | if (!list_empty(&mgr->tx_msg_downq)) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 4985 | process_single_down_tx_qlock(mgr); |
| 4986 | mutex_unlock(&mgr->qlock); |
| 4987 | } |
| 4988 | |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 4989 | static inline void |
| 4990 | drm_dp_delayed_destroy_port(struct drm_dp_mst_port *port) |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 4991 | { |
Imre Deak | 7d11507 | 2020-06-08 00:25:20 +0300 | [diff] [blame] | 4992 | drm_dp_port_set_pdt(port, DP_PEER_DEVICE_NONE, port->mcs); |
| 4993 | |
Lyude Paul | 72dc0f5 | 2020-03-31 16:57:37 -0400 | [diff] [blame] | 4994 | if (port->connector) { |
| 4995 | drm_connector_unregister(port->connector); |
| 4996 | drm_connector_put(port->connector); |
| 4997 | } |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 4998 | |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 4999 | drm_dp_mst_put_port_malloc(port); |
| 5000 | } |
| 5001 | |
| 5002 | static inline void |
| 5003 | drm_dp_delayed_destroy_mstb(struct drm_dp_mst_branch *mstb) |
| 5004 | { |
| 5005 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 5006 | struct drm_dp_mst_port *port, *port_tmp; |
| 5007 | struct drm_dp_sideband_msg_tx *txmsg, *txmsg_tmp; |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5008 | bool wake_tx = false; |
| 5009 | |
| 5010 | mutex_lock(&mgr->lock); |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 5011 | list_for_each_entry_safe(port, port_tmp, &mstb->ports, next) { |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5012 | list_del(&port->next); |
| 5013 | drm_dp_mst_topology_put_port(port); |
| 5014 | } |
| 5015 | mutex_unlock(&mgr->lock); |
| 5016 | |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 5017 | /* drop any tx slot msg */ |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5018 | mutex_lock(&mstb->mgr->qlock); |
Lyude Paul | d308a88 | 2020-04-24 14:13:08 -0400 | [diff] [blame] | 5019 | list_for_each_entry_safe(txmsg, txmsg_tmp, &mgr->tx_msg_downq, next) { |
| 5020 | if (txmsg->dst != mstb) |
| 5021 | continue; |
| 5022 | |
| 5023 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
| 5024 | list_del(&txmsg->next); |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5025 | wake_tx = true; |
| 5026 | } |
| 5027 | mutex_unlock(&mstb->mgr->qlock); |
| 5028 | |
| 5029 | if (wake_tx) |
| 5030 | wake_up_all(&mstb->mgr->tx_waitq); |
| 5031 | |
| 5032 | drm_dp_mst_put_mstb_malloc(mstb); |
| 5033 | } |
| 5034 | |
| 5035 | static void drm_dp_delayed_destroy_work(struct work_struct *work) |
| 5036 | { |
| 5037 | struct drm_dp_mst_topology_mgr *mgr = |
| 5038 | container_of(work, struct drm_dp_mst_topology_mgr, |
| 5039 | delayed_destroy_work); |
| 5040 | bool send_hotplug = false, go_again; |
| 5041 | |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 5042 | /* |
| 5043 | * Not a regular list traverse as we have to drop the destroy |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5044 | * connector lock before destroying the mstb/port, to avoid AB->BA |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 5045 | * ordering between this lock and the config mutex. |
| 5046 | */ |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5047 | do { |
| 5048 | go_again = false; |
| 5049 | |
| 5050 | for (;;) { |
| 5051 | struct drm_dp_mst_branch *mstb; |
| 5052 | |
| 5053 | mutex_lock(&mgr->delayed_destroy_lock); |
| 5054 | mstb = list_first_entry_or_null(&mgr->destroy_branch_device_list, |
| 5055 | struct drm_dp_mst_branch, |
| 5056 | destroy_next); |
| 5057 | if (mstb) |
| 5058 | list_del(&mstb->destroy_next); |
| 5059 | mutex_unlock(&mgr->delayed_destroy_lock); |
| 5060 | |
| 5061 | if (!mstb) |
| 5062 | break; |
| 5063 | |
| 5064 | drm_dp_delayed_destroy_mstb(mstb); |
| 5065 | go_again = true; |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 5066 | } |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 5067 | |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5068 | for (;;) { |
| 5069 | struct drm_dp_mst_port *port; |
Maarten Lankhorst | 4772ff0 | 2015-08-11 09:54:29 +0200 | [diff] [blame] | 5070 | |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5071 | mutex_lock(&mgr->delayed_destroy_lock); |
| 5072 | port = list_first_entry_or_null(&mgr->destroy_port_list, |
| 5073 | struct drm_dp_mst_port, |
| 5074 | next); |
| 5075 | if (port) |
| 5076 | list_del(&port->next); |
| 5077 | mutex_unlock(&mgr->delayed_destroy_lock); |
Maarten Lankhorst | 4772ff0 | 2015-08-11 09:54:29 +0200 | [diff] [blame] | 5078 | |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5079 | if (!port) |
| 5080 | break; |
| 5081 | |
| 5082 | drm_dp_delayed_destroy_port(port); |
| 5083 | send_hotplug = true; |
| 5084 | go_again = true; |
| 5085 | } |
| 5086 | } while (go_again); |
| 5087 | |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 5088 | if (send_hotplug) |
Daniel Vetter | 16bff57 | 2018-11-28 23:12:34 +0100 | [diff] [blame] | 5089 | drm_kms_helper_hotplug_event(mgr->dev); |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 5090 | } |
| 5091 | |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5092 | static struct drm_private_state * |
| 5093 | drm_dp_mst_duplicate_state(struct drm_private_obj *obj) |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5094 | { |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5095 | struct drm_dp_mst_topology_state *state, *old_state = |
| 5096 | to_dp_mst_topology_state(obj->state); |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5097 | struct drm_dp_mst_atomic_payload *pos, *payload; |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5098 | |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5099 | state = kmemdup(old_state, sizeof(*state), GFP_KERNEL); |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5100 | if (!state) |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5101 | return NULL; |
| 5102 | |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5103 | __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); |
| 5104 | |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5105 | INIT_LIST_HEAD(&state->payloads); |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 5106 | state->commit_deps = NULL; |
| 5107 | state->num_commit_deps = 0; |
| 5108 | state->pending_crtc_mask = 0; |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5109 | |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5110 | list_for_each_entry(pos, &old_state->payloads, next) { |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5111 | /* Prune leftover freed timeslot allocations */ |
Lyude Paul | 6366fc7 | 2022-08-17 15:38:44 -0400 | [diff] [blame] | 5112 | if (pos->delete) |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5113 | continue; |
| 5114 | |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5115 | payload = kmemdup(pos, sizeof(*payload), GFP_KERNEL); |
| 5116 | if (!payload) |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5117 | goto fail; |
| 5118 | |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5119 | drm_dp_mst_get_port_malloc(payload->port); |
| 5120 | list_add(&payload->next, &state->payloads); |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5121 | } |
| 5122 | |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5123 | return &state->base; |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5124 | |
| 5125 | fail: |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5126 | list_for_each_entry_safe(pos, payload, &state->payloads, next) { |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5127 | drm_dp_mst_put_port_malloc(pos->port); |
| 5128 | kfree(pos); |
| 5129 | } |
| 5130 | kfree(state); |
| 5131 | |
| 5132 | return NULL; |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5133 | } |
| 5134 | |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5135 | static void drm_dp_mst_destroy_state(struct drm_private_obj *obj, |
| 5136 | struct drm_private_state *state) |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5137 | { |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5138 | struct drm_dp_mst_topology_state *mst_state = |
| 5139 | to_dp_mst_topology_state(state); |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5140 | struct drm_dp_mst_atomic_payload *pos, *tmp; |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 5141 | int i; |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5142 | |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5143 | list_for_each_entry_safe(pos, tmp, &mst_state->payloads, next) { |
Lyude Paul | 6366fc7 | 2022-08-17 15:38:44 -0400 | [diff] [blame] | 5144 | /* We only keep references to ports with active payloads */ |
| 5145 | if (!pos->delete) |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5146 | drm_dp_mst_put_port_malloc(pos->port); |
| 5147 | kfree(pos); |
| 5148 | } |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5149 | |
Lyude Paul | a5c2c0d | 2022-08-17 15:38:37 -0400 | [diff] [blame] | 5150 | for (i = 0; i < mst_state->num_commit_deps; i++) |
| 5151 | drm_crtc_commit_put(mst_state->commit_deps[i]); |
| 5152 | |
| 5153 | kfree(mst_state->commit_deps); |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5154 | kfree(mst_state); |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5155 | } |
| 5156 | |
Mikita Lipski | cd82d82 | 2019-11-06 13:11:23 -0500 | [diff] [blame] | 5157 | static bool drm_dp_mst_port_downstream_of_branch(struct drm_dp_mst_port *port, |
| 5158 | struct drm_dp_mst_branch *branch) |
| 5159 | { |
| 5160 | while (port->parent) { |
| 5161 | if (port->parent == branch) |
| 5162 | return true; |
| 5163 | |
| 5164 | if (port->parent->port_parent) |
| 5165 | port = port->parent->port_parent; |
| 5166 | else |
| 5167 | break; |
| 5168 | } |
| 5169 | return false; |
| 5170 | } |
| 5171 | |
Imre Deak | 9dcf67d | 2023-10-24 04:08:58 +0300 | [diff] [blame] | 5172 | static bool |
| 5173 | drm_dp_mst_port_downstream_of_parent_locked(struct drm_dp_mst_topology_mgr *mgr, |
| 5174 | struct drm_dp_mst_port *port, |
| 5175 | struct drm_dp_mst_port *parent) |
| 5176 | { |
| 5177 | if (!mgr->mst_primary) |
| 5178 | return false; |
| 5179 | |
| 5180 | port = drm_dp_mst_topology_get_port_validated_locked(mgr->mst_primary, |
| 5181 | port); |
| 5182 | if (!port) |
| 5183 | return false; |
| 5184 | |
| 5185 | if (!parent) |
| 5186 | return true; |
| 5187 | |
| 5188 | parent = drm_dp_mst_topology_get_port_validated_locked(mgr->mst_primary, |
| 5189 | parent); |
| 5190 | if (!parent) |
| 5191 | return false; |
| 5192 | |
| 5193 | if (!parent->mstb) |
| 5194 | return false; |
| 5195 | |
| 5196 | return drm_dp_mst_port_downstream_of_branch(port, parent->mstb); |
| 5197 | } |
| 5198 | |
| 5199 | /** |
| 5200 | * drm_dp_mst_port_downstream_of_parent - check if a port is downstream of a parent port |
| 5201 | * @mgr: MST topology manager |
| 5202 | * @port: the port being looked up |
| 5203 | * @parent: the parent port |
| 5204 | * |
| 5205 | * The function returns %true if @port is downstream of @parent. If @parent is |
| 5206 | * %NULL - denoting the root port - the function returns %true if @port is in |
| 5207 | * @mgr's topology. |
| 5208 | */ |
| 5209 | bool |
| 5210 | drm_dp_mst_port_downstream_of_parent(struct drm_dp_mst_topology_mgr *mgr, |
| 5211 | struct drm_dp_mst_port *port, |
| 5212 | struct drm_dp_mst_port *parent) |
| 5213 | { |
| 5214 | bool ret; |
| 5215 | |
| 5216 | mutex_lock(&mgr->lock); |
| 5217 | ret = drm_dp_mst_port_downstream_of_parent_locked(mgr, port, parent); |
| 5218 | mutex_unlock(&mgr->lock); |
| 5219 | |
| 5220 | return ret; |
| 5221 | } |
| 5222 | EXPORT_SYMBOL(drm_dp_mst_port_downstream_of_parent); |
| 5223 | |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5224 | static int |
| 5225 | drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port, |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5226 | struct drm_dp_mst_topology_state *state, |
| 5227 | struct drm_dp_mst_port **failing_port); |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5228 | |
| 5229 | static int |
| 5230 | drm_dp_mst_atomic_check_mstb_bw_limit(struct drm_dp_mst_branch *mstb, |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5231 | struct drm_dp_mst_topology_state *state, |
| 5232 | struct drm_dp_mst_port **failing_port) |
Mikita Lipski | cd82d82 | 2019-11-06 13:11:23 -0500 | [diff] [blame] | 5233 | { |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5234 | struct drm_dp_mst_atomic_payload *payload; |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5235 | struct drm_dp_mst_port *port; |
| 5236 | int pbn_used = 0, ret; |
| 5237 | bool found = false; |
Mikita Lipski | cd82d82 | 2019-11-06 13:11:23 -0500 | [diff] [blame] | 5238 | |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5239 | /* Check that we have at least one port in our state that's downstream |
| 5240 | * of this branch, otherwise we can skip this branch |
| 5241 | */ |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5242 | list_for_each_entry(payload, &state->payloads, next) { |
| 5243 | if (!payload->pbn || |
| 5244 | !drm_dp_mst_port_downstream_of_branch(payload->port, mstb)) |
Mikita Lipski | cd82d82 | 2019-11-06 13:11:23 -0500 | [diff] [blame] | 5245 | continue; |
| 5246 | |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5247 | found = true; |
| 5248 | break; |
Mikita Lipski | cd82d82 | 2019-11-06 13:11:23 -0500 | [diff] [blame] | 5249 | } |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5250 | if (!found) |
| 5251 | return 0; |
Mikita Lipski | cd82d82 | 2019-11-06 13:11:23 -0500 | [diff] [blame] | 5252 | |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5253 | if (mstb->port_parent) |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5254 | drm_dbg_atomic(mstb->mgr->dev, |
| 5255 | "[MSTB:%p] [MST PORT:%p] Checking bandwidth limits on [MSTB:%p]\n", |
| 5256 | mstb->port_parent->parent, mstb->port_parent, mstb); |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5257 | else |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5258 | drm_dbg_atomic(mstb->mgr->dev, "[MSTB:%p] Checking bandwidth limits\n", mstb); |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5259 | |
| 5260 | list_for_each_entry(port, &mstb->ports, next) { |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5261 | ret = drm_dp_mst_atomic_check_port_bw_limit(port, state, failing_port); |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5262 | if (ret < 0) |
| 5263 | return ret; |
| 5264 | |
| 5265 | pbn_used += ret; |
| 5266 | } |
| 5267 | |
| 5268 | return pbn_used; |
| 5269 | } |
| 5270 | |
| 5271 | static int |
| 5272 | drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port, |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5273 | struct drm_dp_mst_topology_state *state, |
| 5274 | struct drm_dp_mst_port **failing_port) |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5275 | { |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5276 | struct drm_dp_mst_atomic_payload *payload; |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5277 | int pbn_used = 0; |
| 5278 | |
| 5279 | if (port->pdt == DP_PEER_DEVICE_NONE) |
| 5280 | return 0; |
| 5281 | |
| 5282 | if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) { |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 5283 | payload = drm_atomic_get_mst_payload_state(state, port); |
| 5284 | if (!payload) |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5285 | return 0; |
| 5286 | |
Imre Deak | f0297cc | 2021-02-16 14:34:48 +0200 | [diff] [blame] | 5287 | /* |
| 5288 | * This could happen if the sink deasserted its HPD line, but |
| 5289 | * the branch device still reports it as attached (PDT != NONE). |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5290 | */ |
Imre Deak | f0297cc | 2021-02-16 14:34:48 +0200 | [diff] [blame] | 5291 | if (!port->full_pbn) { |
| 5292 | drm_dbg_atomic(port->mgr->dev, |
| 5293 | "[MSTB:%p] [MST PORT:%p] no BW available for the port\n", |
| 5294 | port->parent, port); |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5295 | *failing_port = port; |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5296 | return -EINVAL; |
Imre Deak | f0297cc | 2021-02-16 14:34:48 +0200 | [diff] [blame] | 5297 | } |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5298 | |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5299 | pbn_used = payload->pbn; |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5300 | } else { |
| 5301 | pbn_used = drm_dp_mst_atomic_check_mstb_bw_limit(port->mstb, |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5302 | state, |
| 5303 | failing_port); |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5304 | if (pbn_used <= 0) |
| 5305 | return pbn_used; |
| 5306 | } |
| 5307 | |
| 5308 | if (pbn_used > port->full_pbn) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5309 | drm_dbg_atomic(port->mgr->dev, |
| 5310 | "[MSTB:%p] [MST PORT:%p] required PBN of %d exceeds port limit of %d\n", |
| 5311 | port->parent, port, pbn_used, port->full_pbn); |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5312 | *failing_port = port; |
Mikita Lipski | cd82d82 | 2019-11-06 13:11:23 -0500 | [diff] [blame] | 5313 | return -ENOSPC; |
| 5314 | } |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5315 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5316 | drm_dbg_atomic(port->mgr->dev, "[MSTB:%p] [MST PORT:%p] uses %d out of %d PBN\n", |
| 5317 | port->parent, port, pbn_used, port->full_pbn); |
Lyude Paul | 047d4cd | 2020-03-09 17:01:31 -0400 | [diff] [blame] | 5318 | |
| 5319 | return pbn_used; |
Mikita Lipski | cd82d82 | 2019-11-06 13:11:23 -0500 | [diff] [blame] | 5320 | } |
| 5321 | |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5322 | static inline int |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5323 | drm_dp_mst_atomic_check_payload_alloc_limits(struct drm_dp_mst_topology_mgr *mgr, |
| 5324 | struct drm_dp_mst_topology_state *mst_state) |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5325 | { |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5326 | struct drm_dp_mst_atomic_payload *payload; |
Bhawanpreet Lakha | d6c6a76 | 2021-10-25 18:38:22 -0400 | [diff] [blame] | 5327 | int avail_slots = mst_state->total_avail_slots, payload_count = 0; |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5328 | |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5329 | list_for_each_entry(payload, &mst_state->payloads, next) { |
| 5330 | /* Releasing payloads is always OK-even if the port is gone */ |
Lyude Paul | 6366fc7 | 2022-08-17 15:38:44 -0400 | [diff] [blame] | 5331 | if (payload->delete) { |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5332 | drm_dbg_atomic(mgr->dev, "[MST PORT:%p] releases all time slots\n", |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5333 | payload->port); |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5334 | continue; |
| 5335 | } |
| 5336 | |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5337 | drm_dbg_atomic(mgr->dev, "[MST PORT:%p] requires %d time slots\n", |
| 5338 | payload->port, payload->time_slots); |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5339 | |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5340 | avail_slots -= payload->time_slots; |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5341 | if (avail_slots < 0) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5342 | drm_dbg_atomic(mgr->dev, |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5343 | "[MST PORT:%p] not enough time slots in mst state %p (avail=%d)\n", |
| 5344 | payload->port, mst_state, avail_slots + payload->time_slots); |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5345 | return -ENOSPC; |
| 5346 | } |
Lyude Paul | 5e187a0 | 2019-01-10 19:53:42 -0500 | [diff] [blame] | 5347 | |
| 5348 | if (++payload_count > mgr->max_payloads) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5349 | drm_dbg_atomic(mgr->dev, |
| 5350 | "[MST MGR:%p] state %p has too many payloads (max=%d)\n", |
| 5351 | mgr, mst_state, mgr->max_payloads); |
Lyude Paul | 5e187a0 | 2019-01-10 19:53:42 -0500 | [diff] [blame] | 5352 | return -EINVAL; |
| 5353 | } |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5354 | |
| 5355 | /* Assign a VCPI */ |
| 5356 | if (!payload->vcpi) { |
| 5357 | payload->vcpi = ffz(mst_state->payload_mask) + 1; |
| 5358 | drm_dbg_atomic(mgr->dev, "[MST PORT:%p] assigned VCPI #%d\n", |
| 5359 | payload->port, payload->vcpi); |
| 5360 | mst_state->payload_mask |= BIT(payload->vcpi - 1); |
| 5361 | } |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5362 | } |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5363 | |
| 5364 | if (!payload_count) |
Imre Deak | 191dc43 | 2023-11-16 15:18:31 +0200 | [diff] [blame] | 5365 | mst_state->pbn_div.full = dfixed_const(0); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5366 | |
| 5367 | drm_dbg_atomic(mgr->dev, "[MST MGR:%p] mst state %p TU pbn_div=%d avail=%d used=%d\n", |
Imre Deak | 191dc43 | 2023-11-16 15:18:31 +0200 | [diff] [blame] | 5368 | mgr, mst_state, dfixed_trunc(mst_state->pbn_div), avail_slots, |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5369 | mst_state->total_avail_slots - avail_slots); |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5370 | |
| 5371 | return 0; |
| 5372 | } |
| 5373 | |
| 5374 | /** |
Mikita Lipski | 8ec0467 | 2019-11-16 13:32:15 -0500 | [diff] [blame] | 5375 | * drm_dp_mst_add_affected_dsc_crtcs |
| 5376 | * @state: Pointer to the new struct drm_dp_mst_topology_state |
Alex Deucher | 9edb435 | 2020-01-08 22:21:30 -0500 | [diff] [blame] | 5377 | * @mgr: MST topology manager |
Mikita Lipski | 8ec0467 | 2019-11-16 13:32:15 -0500 | [diff] [blame] | 5378 | * |
| 5379 | * Whenever there is a change in mst topology |
| 5380 | * DSC configuration would have to be recalculated |
| 5381 | * therefore we need to trigger modeset on all affected |
| 5382 | * CRTCs in that topology |
| 5383 | * |
| 5384 | * See also: |
| 5385 | * drm_dp_mst_atomic_enable_dsc() |
| 5386 | */ |
| 5387 | int drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, struct drm_dp_mst_topology_mgr *mgr) |
| 5388 | { |
| 5389 | struct drm_dp_mst_topology_state *mst_state; |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5390 | struct drm_dp_mst_atomic_payload *pos; |
Mikita Lipski | 8ec0467 | 2019-11-16 13:32:15 -0500 | [diff] [blame] | 5391 | struct drm_connector *connector; |
| 5392 | struct drm_connector_state *conn_state; |
| 5393 | struct drm_crtc *crtc; |
| 5394 | struct drm_crtc_state *crtc_state; |
| 5395 | |
| 5396 | mst_state = drm_atomic_get_mst_topology_state(state, mgr); |
| 5397 | |
| 5398 | if (IS_ERR(mst_state)) |
Lyude Paul | a3ae995 | 2022-11-14 17:17:53 -0500 | [diff] [blame] | 5399 | return PTR_ERR(mst_state); |
Mikita Lipski | 8ec0467 | 2019-11-16 13:32:15 -0500 | [diff] [blame] | 5400 | |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5401 | list_for_each_entry(pos, &mst_state->payloads, next) { |
Mikita Lipski | 8ec0467 | 2019-11-16 13:32:15 -0500 | [diff] [blame] | 5402 | |
| 5403 | connector = pos->port->connector; |
| 5404 | |
| 5405 | if (!connector) |
| 5406 | return -EINVAL; |
| 5407 | |
| 5408 | conn_state = drm_atomic_get_connector_state(state, connector); |
| 5409 | |
| 5410 | if (IS_ERR(conn_state)) |
| 5411 | return PTR_ERR(conn_state); |
| 5412 | |
| 5413 | crtc = conn_state->crtc; |
| 5414 | |
Bhawanpreet Lakha | 88fee1c | 2020-08-14 13:01:40 -0400 | [diff] [blame] | 5415 | if (!crtc) |
| 5416 | continue; |
Mikita Lipski | 8ec0467 | 2019-11-16 13:32:15 -0500 | [diff] [blame] | 5417 | |
| 5418 | if (!drm_dp_mst_dsc_aux_for_port(pos->port)) |
| 5419 | continue; |
| 5420 | |
| 5421 | crtc_state = drm_atomic_get_crtc_state(mst_state->base.state, crtc); |
| 5422 | |
| 5423 | if (IS_ERR(crtc_state)) |
| 5424 | return PTR_ERR(crtc_state); |
| 5425 | |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5426 | drm_dbg_atomic(mgr->dev, "[MST MGR:%p] Setting mode_changed flag on CRTC %p\n", |
| 5427 | mgr, crtc); |
Mikita Lipski | 8ec0467 | 2019-11-16 13:32:15 -0500 | [diff] [blame] | 5428 | |
| 5429 | crtc_state->mode_changed = true; |
| 5430 | } |
| 5431 | return 0; |
| 5432 | } |
| 5433 | EXPORT_SYMBOL(drm_dp_mst_add_affected_dsc_crtcs); |
| 5434 | |
| 5435 | /** |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5436 | * drm_dp_mst_atomic_enable_dsc - Set DSC Enable Flag to On/Off |
| 5437 | * @state: Pointer to the new drm_atomic_state |
| 5438 | * @port: Pointer to the affected MST Port |
| 5439 | * @pbn: Newly recalculated bw required for link with DSC enabled |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5440 | * @enable: Boolean flag to enable or disable DSC on the port |
| 5441 | * |
| 5442 | * This function enables DSC on the given Port |
| 5443 | * by recalculating its vcpi from pbn provided |
| 5444 | * and sets dsc_enable flag to keep track of which |
| 5445 | * ports have DSC enabled |
| 5446 | * |
| 5447 | */ |
| 5448 | int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state, |
| 5449 | struct drm_dp_mst_port *port, |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5450 | int pbn, bool enable) |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5451 | { |
| 5452 | struct drm_dp_mst_topology_state *mst_state; |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 5453 | struct drm_dp_mst_atomic_payload *payload; |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5454 | int time_slots = 0; |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5455 | |
| 5456 | mst_state = drm_atomic_get_mst_topology_state(state, port->mgr); |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5457 | if (IS_ERR(mst_state)) |
| 5458 | return PTR_ERR(mst_state); |
| 5459 | |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 5460 | payload = drm_atomic_get_mst_payload_state(mst_state, port); |
| 5461 | if (!payload) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5462 | drm_dbg_atomic(state->dev, |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5463 | "[MST PORT:%p] Couldn't find payload in mst state %p\n", |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5464 | port, mst_state); |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5465 | return -EINVAL; |
| 5466 | } |
| 5467 | |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 5468 | if (payload->dsc_enabled == enable) { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5469 | drm_dbg_atomic(state->dev, |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5470 | "[MST PORT:%p] DSC flag is already set to %d, returning %d time slots\n", |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 5471 | port, enable, payload->time_slots); |
| 5472 | time_slots = payload->time_slots; |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5473 | } |
| 5474 | |
| 5475 | if (enable) { |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5476 | time_slots = drm_dp_atomic_find_time_slots(state, port->mgr, port, pbn); |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5477 | drm_dbg_atomic(state->dev, |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5478 | "[MST PORT:%p] Enabling DSC flag, reallocating %d time slots on the port\n", |
| 5479 | port, time_slots); |
| 5480 | if (time_slots < 0) |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5481 | return -EINVAL; |
| 5482 | } |
| 5483 | |
Lyude Paul | 0b4e477 | 2022-08-17 15:38:36 -0400 | [diff] [blame] | 5484 | payload->dsc_enabled = enable; |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5485 | |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5486 | return time_slots; |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5487 | } |
| 5488 | EXPORT_SYMBOL(drm_dp_mst_atomic_enable_dsc); |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5489 | |
Mikita Lipski | 8afb7e6 | 2019-10-28 17:33:32 -0400 | [diff] [blame] | 5490 | /** |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5491 | * drm_dp_mst_atomic_check_mgr - Check the atomic state of an MST topology manager |
| 5492 | * @state: The global atomic state |
| 5493 | * @mgr: Manager to check |
| 5494 | * @mst_state: The MST atomic state for @mgr |
| 5495 | * @failing_port: Returns the port with a BW limitation |
| 5496 | * |
| 5497 | * Checks the given MST manager's topology state for an atomic update to ensure |
| 5498 | * that it's valid. This includes checking whether there's enough bandwidth to |
| 5499 | * support the new timeslot allocations in the atomic update. |
| 5500 | * |
| 5501 | * Any atomic drivers supporting DP MST must make sure to call this or |
| 5502 | * the drm_dp_mst_atomic_check() function after checking the rest of their state |
| 5503 | * in their &drm_mode_config_funcs.atomic_check() callback. |
| 5504 | * |
| 5505 | * See also: |
| 5506 | * drm_dp_mst_atomic_check() |
| 5507 | * drm_dp_atomic_find_time_slots() |
| 5508 | * drm_dp_atomic_release_time_slots() |
| 5509 | * |
| 5510 | * Returns: |
| 5511 | * - 0 if the new state is valid |
| 5512 | * - %-ENOSPC, if the new state is invalid, because of BW limitation |
| 5513 | * @failing_port is set to: |
Bagas Sanjaya | 1a84c21 | 2023-11-14 15:10:33 +0700 | [diff] [blame] | 5514 | * |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5515 | * - The non-root port where a BW limit check failed |
Imre Deak | d075bca | 2023-10-24 04:09:00 +0300 | [diff] [blame] | 5516 | * with all the ports downstream of @failing_port passing |
| 5517 | * the BW limit check. |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5518 | * The returned port pointer is valid until at least |
| 5519 | * one payload downstream of it exists. |
| 5520 | * - %NULL if the BW limit check failed at the root port |
Imre Deak | d075bca | 2023-10-24 04:09:00 +0300 | [diff] [blame] | 5521 | * with all the ports downstream of the root port passing |
| 5522 | * the BW limit check. |
Bagas Sanjaya | 1a84c21 | 2023-11-14 15:10:33 +0700 | [diff] [blame] | 5523 | * |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5524 | * - %-EINVAL, if the new state is invalid, because the root port has |
| 5525 | * too many payloads. |
| 5526 | */ |
| 5527 | int drm_dp_mst_atomic_check_mgr(struct drm_atomic_state *state, |
| 5528 | struct drm_dp_mst_topology_mgr *mgr, |
| 5529 | struct drm_dp_mst_topology_state *mst_state, |
| 5530 | struct drm_dp_mst_port **failing_port) |
| 5531 | { |
| 5532 | int ret; |
| 5533 | |
| 5534 | *failing_port = NULL; |
| 5535 | |
| 5536 | if (!mgr->mst_state) |
| 5537 | return 0; |
| 5538 | |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5539 | mutex_lock(&mgr->lock); |
| 5540 | ret = drm_dp_mst_atomic_check_mstb_bw_limit(mgr->mst_primary, |
| 5541 | mst_state, |
| 5542 | failing_port); |
| 5543 | mutex_unlock(&mgr->lock); |
| 5544 | |
Imre Deak | d075bca | 2023-10-24 04:09:00 +0300 | [diff] [blame] | 5545 | if (ret < 0) |
| 5546 | return ret; |
| 5547 | |
| 5548 | return drm_dp_mst_atomic_check_payload_alloc_limits(mgr, mst_state); |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5549 | } |
| 5550 | EXPORT_SYMBOL(drm_dp_mst_atomic_check_mgr); |
| 5551 | |
| 5552 | /** |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5553 | * drm_dp_mst_atomic_check - Check that the new state of an MST topology in an |
| 5554 | * atomic update is valid |
| 5555 | * @state: Pointer to the new &struct drm_dp_mst_topology_state |
| 5556 | * |
| 5557 | * Checks the given topology state for an atomic update to ensure that it's |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5558 | * valid, calling drm_dp_mst_atomic_check_mgr() for all MST manager in the |
| 5559 | * atomic state. This includes checking whether there's enough bandwidth to |
| 5560 | * support the new timeslot allocations in the atomic update. |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5561 | * |
| 5562 | * Any atomic drivers supporting DP MST must make sure to call this after |
| 5563 | * checking the rest of their state in their |
| 5564 | * &drm_mode_config_funcs.atomic_check() callback. |
| 5565 | * |
| 5566 | * See also: |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5567 | * drm_dp_mst_atomic_check_mgr() |
Lyude Paul | df78f7f | 2022-08-17 15:38:33 -0400 | [diff] [blame] | 5568 | * drm_dp_atomic_find_time_slots() |
| 5569 | * drm_dp_atomic_release_time_slots() |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5570 | * |
| 5571 | * Returns: |
| 5572 | * |
| 5573 | * 0 if the new state is valid, negative error code otherwise. |
| 5574 | */ |
| 5575 | int drm_dp_mst_atomic_check(struct drm_atomic_state *state) |
| 5576 | { |
| 5577 | struct drm_dp_mst_topology_mgr *mgr; |
| 5578 | struct drm_dp_mst_topology_state *mst_state; |
| 5579 | int i, ret = 0; |
| 5580 | |
| 5581 | for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) { |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5582 | struct drm_dp_mst_port *tmp_port; |
José Roberto de Souza | 7b19914 | 2020-01-16 17:58:34 -0800 | [diff] [blame] | 5583 | |
Imre Deak | 1cd0a5e | 2023-10-24 04:08:59 +0300 | [diff] [blame] | 5584 | ret = drm_dp_mst_atomic_check_mgr(state, mgr, mst_state, &tmp_port); |
Lyude Paul | eceae14 | 2019-01-10 19:53:41 -0500 | [diff] [blame] | 5585 | if (ret) |
| 5586 | break; |
| 5587 | } |
| 5588 | |
| 5589 | return ret; |
| 5590 | } |
| 5591 | EXPORT_SYMBOL(drm_dp_mst_atomic_check); |
| 5592 | |
Lyude Paul | bea5c38 | 2019-01-10 19:53:40 -0500 | [diff] [blame] | 5593 | const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs = { |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5594 | .atomic_duplicate_state = drm_dp_mst_duplicate_state, |
| 5595 | .atomic_destroy_state = drm_dp_mst_destroy_state, |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5596 | }; |
Lyude Paul | bea5c38 | 2019-01-10 19:53:40 -0500 | [diff] [blame] | 5597 | EXPORT_SYMBOL(drm_dp_mst_topology_state_funcs); |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5598 | |
| 5599 | /** |
| 5600 | * drm_atomic_get_mst_topology_state: get MST topology state |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5601 | * @state: global atomic state |
| 5602 | * @mgr: MST topology manager, also the private object in this case |
| 5603 | * |
| 5604 | * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic |
| 5605 | * state vtable so that the private object state returned is that of a MST |
Lyude Paul | 87a3451 | 2022-06-02 16:17:57 -0400 | [diff] [blame] | 5606 | * topology object. |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5607 | * |
| 5608 | * RETURNS: |
| 5609 | * |
| 5610 | * The MST topology state or error pointer. |
| 5611 | */ |
| 5612 | struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state, |
| 5613 | struct drm_dp_mst_topology_mgr *mgr) |
| 5614 | { |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5615 | return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base)); |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5616 | } |
| 5617 | EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); |
| 5618 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5619 | /** |
Imre Deak | 9ffdb67 | 2023-02-06 13:48:55 +0200 | [diff] [blame] | 5620 | * drm_atomic_get_old_mst_topology_state: get old MST topology state in atomic state, if any |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5621 | * @state: global atomic state |
| 5622 | * @mgr: MST topology manager, also the private object in this case |
| 5623 | * |
Imre Deak | 9ffdb67 | 2023-02-06 13:48:55 +0200 | [diff] [blame] | 5624 | * This function wraps drm_atomic_get_old_private_obj_state() passing in the MST atomic |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5625 | * state vtable so that the private object state returned is that of a MST |
| 5626 | * topology object. |
| 5627 | * |
| 5628 | * Returns: |
| 5629 | * |
Imre Deak | 9ffdb67 | 2023-02-06 13:48:55 +0200 | [diff] [blame] | 5630 | * The old MST topology state, or NULL if there's no topology state for this MST mgr |
| 5631 | * in the global atomic state |
| 5632 | */ |
| 5633 | struct drm_dp_mst_topology_state * |
| 5634 | drm_atomic_get_old_mst_topology_state(struct drm_atomic_state *state, |
| 5635 | struct drm_dp_mst_topology_mgr *mgr) |
| 5636 | { |
| 5637 | struct drm_private_state *old_priv_state = |
| 5638 | drm_atomic_get_old_private_obj_state(state, &mgr->base); |
| 5639 | |
| 5640 | return old_priv_state ? to_dp_mst_topology_state(old_priv_state) : NULL; |
| 5641 | } |
| 5642 | EXPORT_SYMBOL(drm_atomic_get_old_mst_topology_state); |
| 5643 | |
| 5644 | /** |
| 5645 | * drm_atomic_get_new_mst_topology_state: get new MST topology state in atomic state, if any |
| 5646 | * @state: global atomic state |
| 5647 | * @mgr: MST topology manager, also the private object in this case |
| 5648 | * |
| 5649 | * This function wraps drm_atomic_get_new_private_obj_state() passing in the MST atomic |
| 5650 | * state vtable so that the private object state returned is that of a MST |
| 5651 | * topology object. |
| 5652 | * |
| 5653 | * Returns: |
| 5654 | * |
| 5655 | * The new MST topology state, or NULL if there's no topology state for this MST mgr |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5656 | * in the global atomic state |
| 5657 | */ |
| 5658 | struct drm_dp_mst_topology_state * |
| 5659 | drm_atomic_get_new_mst_topology_state(struct drm_atomic_state *state, |
| 5660 | struct drm_dp_mst_topology_mgr *mgr) |
| 5661 | { |
Imre Deak | 9ffdb67 | 2023-02-06 13:48:55 +0200 | [diff] [blame] | 5662 | struct drm_private_state *new_priv_state = |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5663 | drm_atomic_get_new_private_obj_state(state, &mgr->base); |
| 5664 | |
Imre Deak | 9ffdb67 | 2023-02-06 13:48:55 +0200 | [diff] [blame] | 5665 | return new_priv_state ? to_dp_mst_topology_state(new_priv_state) : NULL; |
Lyude Paul | 4d07b0b | 2022-08-17 15:38:46 -0400 | [diff] [blame] | 5666 | } |
| 5667 | EXPORT_SYMBOL(drm_atomic_get_new_mst_topology_state); |
| 5668 | |
| 5669 | /** |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5670 | * drm_dp_mst_topology_mgr_init - initialise a topology manager |
| 5671 | * @mgr: manager struct to initialise |
| 5672 | * @dev: device providing this structure - for i2c addition. |
| 5673 | * @aux: DP helper aux channel to talk to this device |
| 5674 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit |
| 5675 | * @max_payloads: maximum number of payloads this GPU can source |
| 5676 | * @conn_base_id: the connector object ID the MST device is connected to. |
| 5677 | * |
| 5678 | * Return 0 for success, or negative error code on failure |
| 5679 | */ |
| 5680 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, |
Dhinakaran Pandiyan | 7b0a89a | 2017-01-24 15:49:29 -0800 | [diff] [blame] | 5681 | struct drm_device *dev, struct drm_dp_aux *aux, |
Nikola Cornij | 98025a6 | 2021-04-29 18:11:51 -0400 | [diff] [blame] | 5682 | int max_dpcd_transaction_bytes, int max_payloads, |
Nikola Cornij | 98025a6 | 2021-04-29 18:11:51 -0400 | [diff] [blame] | 5683 | int conn_base_id) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5684 | { |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5685 | struct drm_dp_mst_topology_state *mst_state; |
| 5686 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5687 | mutex_init(&mgr->lock); |
| 5688 | mutex_init(&mgr->qlock); |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5689 | mutex_init(&mgr->delayed_destroy_lock); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 5690 | mutex_init(&mgr->up_req_lock); |
Lyude Paul | 14692a3 | 2019-10-16 16:02:59 -0400 | [diff] [blame] | 5691 | mutex_init(&mgr->probe_lock); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 5692 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) |
| 5693 | mutex_init(&mgr->topology_ref_history_lock); |
Vlastimil Babka | 2dba5eb | 2022-01-21 22:14:27 -0800 | [diff] [blame] | 5694 | stack_depot_init(); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 5695 | #endif |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5696 | INIT_LIST_HEAD(&mgr->tx_msg_downq); |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5697 | INIT_LIST_HEAD(&mgr->destroy_port_list); |
| 5698 | INIT_LIST_HEAD(&mgr->destroy_branch_device_list); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 5699 | INIT_LIST_HEAD(&mgr->up_req_list); |
Imre Deak | 72822c3 | 2020-06-10 16:47:04 +0300 | [diff] [blame] | 5700 | |
| 5701 | /* |
| 5702 | * delayed_destroy_work will be queued on a dedicated WQ, so that any |
| 5703 | * requeuing will be also flushed when deiniting the topology manager. |
| 5704 | */ |
| 5705 | mgr->delayed_destroy_wq = alloc_ordered_workqueue("drm_dp_mst_wq", 0); |
| 5706 | if (mgr->delayed_destroy_wq == NULL) |
| 5707 | return -ENOMEM; |
| 5708 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5709 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); |
| 5710 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5711 | INIT_WORK(&mgr->delayed_destroy_work, drm_dp_delayed_destroy_work); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 5712 | INIT_WORK(&mgr->up_req_work, drm_dp_mst_up_req_work); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5713 | init_waitqueue_head(&mgr->tx_waitq); |
| 5714 | mgr->dev = dev; |
| 5715 | mgr->aux = aux; |
| 5716 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; |
| 5717 | mgr->max_payloads = max_payloads; |
| 5718 | mgr->conn_base_id = conn_base_id; |
Imre Deak | 441388a | 2016-01-29 14:44:28 +0200 | [diff] [blame] | 5719 | |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5720 | mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL); |
| 5721 | if (mst_state == NULL) |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5722 | return -ENOMEM; |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5723 | |
Bhawanpreet Lakha | d6c6a76 | 2021-10-25 18:38:22 -0400 | [diff] [blame] | 5724 | mst_state->total_avail_slots = 63; |
| 5725 | mst_state->start_slot = 1; |
| 5726 | |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5727 | mst_state->mgr = mgr; |
Lyude Paul | 48b6b37 | 2022-08-17 15:38:32 -0400 | [diff] [blame] | 5728 | INIT_LIST_HEAD(&mst_state->payloads); |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5729 | |
Rob Clark | b962a12 | 2018-10-22 14:31:22 +0200 | [diff] [blame] | 5730 | drm_atomic_private_obj_init(dev, &mgr->base, |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5731 | &mst_state->base, |
Lyude Paul | bea5c38 | 2019-01-10 19:53:40 -0500 | [diff] [blame] | 5732 | &drm_dp_mst_topology_state_funcs); |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5733 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5734 | return 0; |
| 5735 | } |
| 5736 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); |
| 5737 | |
| 5738 | /** |
| 5739 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. |
| 5740 | * @mgr: manager to destroy |
| 5741 | */ |
| 5742 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) |
| 5743 | { |
Lyude Paul | f536e00 | 2018-12-11 18:50:26 -0500 | [diff] [blame] | 5744 | drm_dp_mst_topology_mgr_set_mst(mgr, false); |
Dave Airlie | 274d835 | 2015-09-30 10:39:42 +1000 | [diff] [blame] | 5745 | flush_work(&mgr->work); |
Imre Deak | 72822c3 | 2020-06-10 16:47:04 +0300 | [diff] [blame] | 5746 | /* The following will also drain any requeued work on the WQ. */ |
| 5747 | if (mgr->delayed_destroy_wq) { |
| 5748 | destroy_workqueue(mgr->delayed_destroy_wq); |
| 5749 | mgr->delayed_destroy_wq = NULL; |
| 5750 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5751 | mgr->dev = NULL; |
| 5752 | mgr->aux = NULL; |
Ville Syrjälä | a4370c7 | 2017-07-12 18:51:02 +0300 | [diff] [blame] | 5753 | drm_atomic_private_obj_fini(&mgr->base); |
Pandiyan, Dhinakaran | 3f3353b | 2017-04-20 22:51:31 -0700 | [diff] [blame] | 5754 | mgr->funcs = NULL; |
Lyude Paul | 50094b5 | 2019-09-03 16:45:52 -0400 | [diff] [blame] | 5755 | |
Lyude Paul | 7cb12d4 | 2019-02-19 17:41:02 -0500 | [diff] [blame] | 5756 | mutex_destroy(&mgr->delayed_destroy_lock); |
Lyude Paul | 50094b5 | 2019-09-03 16:45:52 -0400 | [diff] [blame] | 5757 | mutex_destroy(&mgr->qlock); |
| 5758 | mutex_destroy(&mgr->lock); |
Lyude Paul | 9408cc9 | 2019-06-17 16:37:18 -0400 | [diff] [blame] | 5759 | mutex_destroy(&mgr->up_req_lock); |
Lyude Paul | 14692a3 | 2019-10-16 16:02:59 -0400 | [diff] [blame] | 5760 | mutex_destroy(&mgr->probe_lock); |
Lyude Paul | 12a280c | 2019-06-20 17:59:25 -0400 | [diff] [blame] | 5761 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) |
| 5762 | mutex_destroy(&mgr->topology_ref_history_lock); |
| 5763 | #endif |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5764 | } |
| 5765 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); |
| 5766 | |
Ville Syrjälä | cb8ce71 | 2018-09-28 21:04:00 +0300 | [diff] [blame] | 5767 | static bool remote_i2c_read_ok(const struct i2c_msg msgs[], int num) |
| 5768 | { |
| 5769 | int i; |
| 5770 | |
| 5771 | if (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS) |
| 5772 | return false; |
| 5773 | |
| 5774 | for (i = 0; i < num - 1; i++) { |
| 5775 | if (msgs[i].flags & I2C_M_RD || |
| 5776 | msgs[i].len > 0xff) |
| 5777 | return false; |
| 5778 | } |
| 5779 | |
| 5780 | return msgs[num - 1].flags & I2C_M_RD && |
| 5781 | msgs[num - 1].len <= 0xff; |
| 5782 | } |
| 5783 | |
Sam McNally | adb48b2 | 2020-07-27 16:03:37 +1000 | [diff] [blame] | 5784 | static bool remote_i2c_write_ok(const struct i2c_msg msgs[], int num) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5785 | { |
Sam McNally | adb48b2 | 2020-07-27 16:03:37 +1000 | [diff] [blame] | 5786 | int i; |
| 5787 | |
| 5788 | for (i = 0; i < num - 1; i++) { |
| 5789 | if (msgs[i].flags & I2C_M_RD || !(msgs[i].flags & I2C_M_STOP) || |
| 5790 | msgs[i].len > 0xff) |
| 5791 | return false; |
| 5792 | } |
| 5793 | |
| 5794 | return !(msgs[num - 1].flags & I2C_M_RD) && msgs[num - 1].len <= 0xff; |
| 5795 | } |
| 5796 | |
| 5797 | static int drm_dp_mst_i2c_read(struct drm_dp_mst_branch *mstb, |
| 5798 | struct drm_dp_mst_port *port, |
| 5799 | struct i2c_msg *msgs, int num) |
| 5800 | { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5801 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 5802 | unsigned int i; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5803 | struct drm_dp_sideband_msg_req_body msg; |
| 5804 | struct drm_dp_sideband_msg_tx *txmsg = NULL; |
| 5805 | int ret; |
| 5806 | |
Dave Airlie | ae49154 | 2015-10-14 18:51:17 +1000 | [diff] [blame] | 5807 | memset(&msg, 0, sizeof(msg)); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5808 | msg.req_type = DP_REMOTE_I2C_READ; |
| 5809 | msg.u.i2c_read.num_transactions = num - 1; |
| 5810 | msg.u.i2c_read.port_number = port->port_num; |
| 5811 | for (i = 0; i < num - 1; i++) { |
| 5812 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; |
| 5813 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; |
| 5814 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; |
Ville Syrjälä | c978ae9 | 2018-09-28 21:03:59 +0300 | [diff] [blame] | 5815 | msg.u.i2c_read.transactions[i].no_stop_bit = !(msgs[i].flags & I2C_M_STOP); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5816 | } |
| 5817 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; |
| 5818 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; |
| 5819 | |
| 5820 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 5821 | if (!txmsg) { |
| 5822 | ret = -ENOMEM; |
| 5823 | goto out; |
| 5824 | } |
| 5825 | |
| 5826 | txmsg->dst = mstb; |
| 5827 | drm_dp_encode_sideband_req(&msg, txmsg); |
| 5828 | |
| 5829 | drm_dp_queue_down_tx(mgr, txmsg); |
| 5830 | |
| 5831 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 5832 | if (ret > 0) { |
| 5833 | |
Ville Syrjälä | 45bbda1 | 2019-01-22 22:03:00 +0200 | [diff] [blame] | 5834 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5835 | ret = -EREMOTEIO; |
| 5836 | goto out; |
| 5837 | } |
| 5838 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { |
| 5839 | ret = -EIO; |
| 5840 | goto out; |
| 5841 | } |
| 5842 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); |
| 5843 | ret = num; |
| 5844 | } |
| 5845 | out: |
| 5846 | kfree(txmsg); |
Sam McNally | adb48b2 | 2020-07-27 16:03:37 +1000 | [diff] [blame] | 5847 | return ret; |
| 5848 | } |
| 5849 | |
| 5850 | static int drm_dp_mst_i2c_write(struct drm_dp_mst_branch *mstb, |
| 5851 | struct drm_dp_mst_port *port, |
| 5852 | struct i2c_msg *msgs, int num) |
| 5853 | { |
| 5854 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 5855 | unsigned int i; |
| 5856 | struct drm_dp_sideband_msg_req_body msg; |
| 5857 | struct drm_dp_sideband_msg_tx *txmsg = NULL; |
| 5858 | int ret; |
| 5859 | |
| 5860 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 5861 | if (!txmsg) { |
| 5862 | ret = -ENOMEM; |
| 5863 | goto out; |
| 5864 | } |
| 5865 | for (i = 0; i < num; i++) { |
| 5866 | memset(&msg, 0, sizeof(msg)); |
| 5867 | msg.req_type = DP_REMOTE_I2C_WRITE; |
| 5868 | msg.u.i2c_write.port_number = port->port_num; |
| 5869 | msg.u.i2c_write.write_i2c_device_id = msgs[i].addr; |
| 5870 | msg.u.i2c_write.num_bytes = msgs[i].len; |
| 5871 | msg.u.i2c_write.bytes = msgs[i].buf; |
| 5872 | |
| 5873 | memset(txmsg, 0, sizeof(*txmsg)); |
| 5874 | txmsg->dst = mstb; |
| 5875 | |
| 5876 | drm_dp_encode_sideband_req(&msg, txmsg); |
| 5877 | drm_dp_queue_down_tx(mgr, txmsg); |
| 5878 | |
| 5879 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 5880 | if (ret > 0) { |
| 5881 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
| 5882 | ret = -EREMOTEIO; |
| 5883 | goto out; |
| 5884 | } |
| 5885 | } else { |
| 5886 | goto out; |
| 5887 | } |
| 5888 | } |
| 5889 | ret = num; |
| 5890 | out: |
| 5891 | kfree(txmsg); |
| 5892 | return ret; |
| 5893 | } |
| 5894 | |
| 5895 | /* I2C device */ |
| 5896 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, |
| 5897 | struct i2c_msg *msgs, int num) |
| 5898 | { |
| 5899 | struct drm_dp_aux *aux = adapter->algo_data; |
| 5900 | struct drm_dp_mst_port *port = |
| 5901 | container_of(aux, struct drm_dp_mst_port, aux); |
| 5902 | struct drm_dp_mst_branch *mstb; |
| 5903 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 5904 | int ret; |
| 5905 | |
| 5906 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
| 5907 | if (!mstb) |
| 5908 | return -EREMOTEIO; |
| 5909 | |
| 5910 | if (remote_i2c_read_ok(msgs, num)) { |
| 5911 | ret = drm_dp_mst_i2c_read(mstb, port, msgs, num); |
| 5912 | } else if (remote_i2c_write_ok(msgs, num)) { |
| 5913 | ret = drm_dp_mst_i2c_write(mstb, port, msgs, num); |
| 5914 | } else { |
Lyude Paul | 3a08f53 | 2021-04-23 14:43:09 -0400 | [diff] [blame] | 5915 | drm_dbg_kms(mgr->dev, "Unsupported I2C transaction for MST device\n"); |
Sam McNally | adb48b2 | 2020-07-27 16:03:37 +1000 | [diff] [blame] | 5916 | ret = -EIO; |
| 5917 | } |
| 5918 | |
Lyude Paul | d0757af | 2019-01-10 19:53:28 -0500 | [diff] [blame] | 5919 | drm_dp_mst_topology_put_mstb(mstb); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5920 | return ret; |
| 5921 | } |
| 5922 | |
| 5923 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) |
| 5924 | { |
| 5925 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | |
| 5926 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | |
| 5927 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | |
| 5928 | I2C_FUNC_10BIT_ADDR; |
| 5929 | } |
| 5930 | |
| 5931 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { |
| 5932 | .functionality = drm_dp_mst_i2c_functionality, |
| 5933 | .master_xfer = drm_dp_mst_i2c_xfer, |
| 5934 | }; |
| 5935 | |
| 5936 | /** |
| 5937 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX |
Imre Deak | d8bd15b | 2020-06-08 00:25:21 +0300 | [diff] [blame] | 5938 | * @port: The port to add the I2C bus on |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5939 | * |
| 5940 | * Returns 0 on success or a negative error code on failure. |
| 5941 | */ |
Imre Deak | d8bd15b | 2020-06-08 00:25:21 +0300 | [diff] [blame] | 5942 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_mst_port *port) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5943 | { |
Imre Deak | d8bd15b | 2020-06-08 00:25:21 +0300 | [diff] [blame] | 5944 | struct drm_dp_aux *aux = &port->aux; |
| 5945 | struct device *parent_dev = port->mgr->dev->dev; |
| 5946 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5947 | aux->ddc.algo = &drm_dp_mst_i2c_algo; |
| 5948 | aux->ddc.algo_data = aux; |
| 5949 | aux->ddc.retries = 3; |
| 5950 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5951 | aux->ddc.owner = THIS_MODULE; |
Imre Deak | d8bd15b | 2020-06-08 00:25:21 +0300 | [diff] [blame] | 5952 | /* FIXME: set the kdev of the port's connector as parent */ |
| 5953 | aux->ddc.dev.parent = parent_dev; |
| 5954 | aux->ddc.dev.of_node = parent_dev->of_node; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5955 | |
Azeem Shaikh | 533950d | 2023-05-22 15:51:24 +0000 | [diff] [blame] | 5956 | strscpy(aux->ddc.name, aux->name ? aux->name : dev_name(parent_dev), |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5957 | sizeof(aux->ddc.name)); |
| 5958 | |
| 5959 | return i2c_add_adapter(&aux->ddc); |
| 5960 | } |
| 5961 | |
| 5962 | /** |
| 5963 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter |
Imre Deak | d8bd15b | 2020-06-08 00:25:21 +0300 | [diff] [blame] | 5964 | * @port: The port to remove the I2C bus from |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5965 | */ |
Imre Deak | d8bd15b | 2020-06-08 00:25:21 +0300 | [diff] [blame] | 5966 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_mst_port *port) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5967 | { |
Imre Deak | d8bd15b | 2020-06-08 00:25:21 +0300 | [diff] [blame] | 5968 | i2c_del_adapter(&port->aux.ddc); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 5969 | } |
David Francis | c2bc1b6 | 2019-08-26 09:50:28 -0400 | [diff] [blame] | 5970 | |
| 5971 | /** |
| 5972 | * drm_dp_mst_is_virtual_dpcd() - Is the given port a virtual DP Peer Device |
| 5973 | * @port: The port to check |
| 5974 | * |
| 5975 | * A single physical MST hub object can be represented in the topology |
| 5976 | * by multiple branches, with virtual ports between those branches. |
| 5977 | * |
| 5978 | * As of DP1.4, An MST hub with internal (virtual) ports must expose |
| 5979 | * certain DPCD registers over those ports. See sections 2.6.1.1.1 |
| 5980 | * and 2.6.1.1.2 of Display Port specification v1.4 for details. |
| 5981 | * |
| 5982 | * May acquire mgr->lock |
| 5983 | * |
| 5984 | * Returns: |
| 5985 | * true if the port is a virtual DP peer device, false otherwise |
| 5986 | */ |
| 5987 | static bool drm_dp_mst_is_virtual_dpcd(struct drm_dp_mst_port *port) |
| 5988 | { |
| 5989 | struct drm_dp_mst_port *downstream_port; |
| 5990 | |
| 5991 | if (!port || port->dpcd_rev < DP_DPCD_REV_14) |
| 5992 | return false; |
| 5993 | |
| 5994 | /* Virtual DP Sink (Internal Display Panel) */ |
Imre Deak | ca5d9d7 | 2024-04-17 01:10:07 +0300 | [diff] [blame] | 5995 | if (drm_dp_mst_port_is_logical(port)) |
David Francis | c2bc1b6 | 2019-08-26 09:50:28 -0400 | [diff] [blame] | 5996 | return true; |
| 5997 | |
| 5998 | /* DP-to-HDMI Protocol Converter */ |
| 5999 | if (port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV && |
| 6000 | !port->mcs && |
| 6001 | port->ldps) |
| 6002 | return true; |
| 6003 | |
| 6004 | /* DP-to-DP */ |
| 6005 | mutex_lock(&port->mgr->lock); |
| 6006 | if (port->pdt == DP_PEER_DEVICE_MST_BRANCHING && |
| 6007 | port->mstb && |
| 6008 | port->mstb->num_ports == 2) { |
| 6009 | list_for_each_entry(downstream_port, &port->mstb->ports, next) { |
| 6010 | if (downstream_port->pdt == DP_PEER_DEVICE_SST_SINK && |
| 6011 | !downstream_port->input) { |
| 6012 | mutex_unlock(&port->mgr->lock); |
| 6013 | return true; |
| 6014 | } |
| 6015 | } |
| 6016 | } |
| 6017 | mutex_unlock(&port->mgr->lock); |
| 6018 | |
| 6019 | return false; |
| 6020 | } |
| 6021 | |
| 6022 | /** |
Imre Deak | 93cb409 | 2024-04-17 01:10:08 +0300 | [diff] [blame] | 6023 | * drm_dp_mst_aux_for_parent() - Get the AUX device for an MST port's parent |
| 6024 | * @port: MST port whose parent's AUX device is returned |
| 6025 | * |
| 6026 | * Return the AUX device for @port's parent or NULL if port's parent is the |
| 6027 | * root port. |
| 6028 | */ |
| 6029 | struct drm_dp_aux *drm_dp_mst_aux_for_parent(struct drm_dp_mst_port *port) |
| 6030 | { |
| 6031 | if (!port->parent || !port->parent->port_parent) |
| 6032 | return NULL; |
| 6033 | |
| 6034 | return &port->parent->port_parent->aux; |
| 6035 | } |
| 6036 | EXPORT_SYMBOL(drm_dp_mst_aux_for_parent); |
| 6037 | |
| 6038 | /** |
David Francis | c2bc1b6 | 2019-08-26 09:50:28 -0400 | [diff] [blame] | 6039 | * drm_dp_mst_dsc_aux_for_port() - Find the correct aux for DSC |
| 6040 | * @port: The port to check. A leaf of the MST tree with an attached display. |
| 6041 | * |
| 6042 | * Depending on the situation, DSC may be enabled via the endpoint aux, |
| 6043 | * the immediately upstream aux, or the connector's physical aux. |
| 6044 | * |
| 6045 | * This is both the correct aux to read DSC_CAPABILITY and the |
| 6046 | * correct aux to write DSC_ENABLED. |
| 6047 | * |
| 6048 | * This operation can be expensive (up to four aux reads), so |
| 6049 | * the caller should cache the return. |
| 6050 | * |
| 6051 | * Returns: |
| 6052 | * NULL if DSC cannot be enabled on this port, otherwise the aux device |
| 6053 | */ |
| 6054 | struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) |
| 6055 | { |
| 6056 | struct drm_dp_mst_port *immediate_upstream_port; |
Imre Deak | 6f1aa39 | 2023-10-24 04:09:01 +0300 | [diff] [blame] | 6057 | struct drm_dp_aux *immediate_upstream_aux; |
David Francis | c2bc1b6 | 2019-08-26 09:50:28 -0400 | [diff] [blame] | 6058 | struct drm_dp_mst_port *fec_port; |
Chris Wilson | a4292e5 | 2020-05-16 22:23:30 +0100 | [diff] [blame] | 6059 | struct drm_dp_desc desc = {}; |
David Francis | c2bc1b6 | 2019-08-26 09:50:28 -0400 | [diff] [blame] | 6060 | u8 endpoint_fec; |
| 6061 | u8 endpoint_dsc; |
| 6062 | |
| 6063 | if (!port) |
| 6064 | return NULL; |
| 6065 | |
| 6066 | if (port->parent->port_parent) |
| 6067 | immediate_upstream_port = port->parent->port_parent; |
| 6068 | else |
| 6069 | immediate_upstream_port = NULL; |
| 6070 | |
| 6071 | fec_port = immediate_upstream_port; |
| 6072 | while (fec_port) { |
| 6073 | /* |
| 6074 | * Each physical link (i.e. not a virtual port) between the |
| 6075 | * output and the primary device must support FEC |
| 6076 | */ |
| 6077 | if (!drm_dp_mst_is_virtual_dpcd(fec_port) && |
| 6078 | !fec_port->fec_capable) |
| 6079 | return NULL; |
| 6080 | |
| 6081 | fec_port = fec_port->parent->port_parent; |
| 6082 | } |
| 6083 | |
| 6084 | /* DP-to-DP peer device */ |
| 6085 | if (drm_dp_mst_is_virtual_dpcd(immediate_upstream_port)) { |
| 6086 | u8 upstream_dsc; |
| 6087 | |
| 6088 | if (drm_dp_dpcd_read(&port->aux, |
| 6089 | DP_DSC_SUPPORT, &endpoint_dsc, 1) != 1) |
| 6090 | return NULL; |
| 6091 | if (drm_dp_dpcd_read(&port->aux, |
| 6092 | DP_FEC_CAPABILITY, &endpoint_fec, 1) != 1) |
| 6093 | return NULL; |
| 6094 | if (drm_dp_dpcd_read(&immediate_upstream_port->aux, |
| 6095 | DP_DSC_SUPPORT, &upstream_dsc, 1) != 1) |
| 6096 | return NULL; |
| 6097 | |
| 6098 | /* Enpoint decompression with DP-to-DP peer device */ |
| 6099 | if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED) && |
| 6100 | (endpoint_fec & DP_FEC_CAPABLE) && |
Hamza Mahfooz | 34f6676 | 2022-08-04 14:06:55 -0400 | [diff] [blame] | 6101 | (upstream_dsc & DP_DSC_PASSTHROUGH_IS_SUPPORTED)) { |
| 6102 | port->passthrough_aux = &immediate_upstream_port->aux; |
David Francis | c2bc1b6 | 2019-08-26 09:50:28 -0400 | [diff] [blame] | 6103 | return &port->aux; |
Hamza Mahfooz | 34f6676 | 2022-08-04 14:06:55 -0400 | [diff] [blame] | 6104 | } |
David Francis | c2bc1b6 | 2019-08-26 09:50:28 -0400 | [diff] [blame] | 6105 | |
| 6106 | /* Virtual DPCD decompression with DP-to-DP peer device */ |
| 6107 | return &immediate_upstream_port->aux; |
| 6108 | } |
| 6109 | |
| 6110 | /* Virtual DPCD decompression with DP-to-HDMI or Virtual DP Sink */ |
| 6111 | if (drm_dp_mst_is_virtual_dpcd(port)) |
| 6112 | return &port->aux; |
| 6113 | |
| 6114 | /* |
Mikita Lipski | 5b03f9d | 2019-09-20 15:44:56 -0400 | [diff] [blame] | 6115 | * Synaptics quirk |
| 6116 | * Applies to ports for which: |
| 6117 | * - Physical aux has Synaptics OUI |
| 6118 | * - DPv1.4 or higher |
| 6119 | * - Port is on primary branch device |
| 6120 | * - Not a VGA adapter (DP_DWN_STRM_PORT_TYPE_ANALOG) |
| 6121 | */ |
Imre Deak | 6f1aa39 | 2023-10-24 04:09:01 +0300 | [diff] [blame] | 6122 | if (immediate_upstream_port) |
| 6123 | immediate_upstream_aux = &immediate_upstream_port->aux; |
| 6124 | else |
| 6125 | immediate_upstream_aux = port->mgr->aux; |
| 6126 | |
| 6127 | if (drm_dp_read_desc(immediate_upstream_aux, &desc, true)) |
Mikita Lipski | 5b03f9d | 2019-09-20 15:44:56 -0400 | [diff] [blame] | 6128 | return NULL; |
| 6129 | |
Imre Deak | 6f1aa39 | 2023-10-24 04:09:01 +0300 | [diff] [blame] | 6130 | if (drm_dp_has_quirk(&desc, DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD)) { |
Nikola Cornij | 98025a6 | 2021-04-29 18:11:51 -0400 | [diff] [blame] | 6131 | u8 dpcd_ext[DP_RECEIVER_CAP_SIZE]; |
Mikita Lipski | 5b03f9d | 2019-09-20 15:44:56 -0400 | [diff] [blame] | 6132 | |
Imre Deak | 6f1aa39 | 2023-10-24 04:09:01 +0300 | [diff] [blame] | 6133 | if (drm_dp_read_dpcd_caps(immediate_upstream_aux, dpcd_ext) < 0) |
Mikita Lipski | 5b03f9d | 2019-09-20 15:44:56 -0400 | [diff] [blame] | 6134 | return NULL; |
| 6135 | |
Imre Deak | 6f1aa39 | 2023-10-24 04:09:01 +0300 | [diff] [blame] | 6136 | if (dpcd_ext[DP_DPCD_REV] >= DP_DPCD_REV_14 && |
| 6137 | ((dpcd_ext[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT) && |
Nikola Cornij | 98025a6 | 2021-04-29 18:11:51 -0400 | [diff] [blame] | 6138 | ((dpcd_ext[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_TYPE_MASK) |
Imre Deak | 6f1aa39 | 2023-10-24 04:09:01 +0300 | [diff] [blame] | 6139 | != DP_DWN_STRM_PORT_TYPE_ANALOG))) |
| 6140 | return immediate_upstream_aux; |
Mikita Lipski | 5b03f9d | 2019-09-20 15:44:56 -0400 | [diff] [blame] | 6141 | } |
| 6142 | |
| 6143 | /* |
David Francis | c2bc1b6 | 2019-08-26 09:50:28 -0400 | [diff] [blame] | 6144 | * The check below verifies if the MST sink |
| 6145 | * connected to the GPU is capable of DSC - |
| 6146 | * therefore the endpoint needs to be |
| 6147 | * both DSC and FEC capable. |
| 6148 | */ |
| 6149 | if (drm_dp_dpcd_read(&port->aux, |
| 6150 | DP_DSC_SUPPORT, &endpoint_dsc, 1) != 1) |
| 6151 | return NULL; |
| 6152 | if (drm_dp_dpcd_read(&port->aux, |
| 6153 | DP_FEC_CAPABILITY, &endpoint_fec, 1) != 1) |
| 6154 | return NULL; |
| 6155 | if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED) && |
| 6156 | (endpoint_fec & DP_FEC_CAPABLE)) |
| 6157 | return &port->aux; |
| 6158 | |
| 6159 | return NULL; |
| 6160 | } |
| 6161 | EXPORT_SYMBOL(drm_dp_mst_dsc_aux_for_port); |