Pierre-Louis Bossart | 7cbf00b | 2022-11-11 09:31:34 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
| 2 | // Copyright(c) 2015-22 Intel Corporation. |
| 3 | |
| 4 | /* |
| 5 | * Soundwire Intel Manager Driver |
| 6 | */ |
| 7 | |
| 8 | #include <linux/acpi.h> |
| 9 | #include <linux/debugfs.h> |
| 10 | #include <linux/delay.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/interrupt.h> |
| 13 | #include <linux/io.h> |
| 14 | #include <linux/auxiliary_bus.h> |
| 15 | #include <sound/pcm_params.h> |
| 16 | #include <linux/pm_runtime.h> |
| 17 | #include <sound/soc.h> |
| 18 | #include <linux/soundwire/sdw_registers.h> |
| 19 | #include <linux/soundwire/sdw.h> |
| 20 | #include <linux/soundwire/sdw_intel.h> |
| 21 | #include "cadence_master.h" |
| 22 | #include "bus.h" |
| 23 | #include "intel.h" |
| 24 | #include "intel_auxdevice.h" |
| 25 | |
| 26 | /* IDA min selected to avoid conflicts with HDaudio/iDISP SDI values */ |
| 27 | #define INTEL_DEV_NUM_IDA_MIN 4 |
| 28 | |
| 29 | #define INTEL_MASTER_SUSPEND_DELAY_MS 3000 |
| 30 | |
| 31 | /* |
| 32 | * debug/config flags for the Intel SoundWire Master. |
| 33 | * |
| 34 | * Since we may have multiple masters active, we can have up to 8 |
| 35 | * flags reused in each byte, with master0 using the ls-byte, etc. |
| 36 | */ |
| 37 | |
| 38 | #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME BIT(0) |
| 39 | #define SDW_INTEL_MASTER_DISABLE_CLOCK_STOP BIT(1) |
| 40 | #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE BIT(2) |
| 41 | #define SDW_INTEL_MASTER_DISABLE_MULTI_LINK BIT(3) |
| 42 | |
| 43 | static int md_flags; |
| 44 | module_param_named(sdw_md_flags, md_flags, int, 0444); |
| 45 | MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)"); |
| 46 | |
| 47 | static int generic_pre_bank_switch(struct sdw_bus *bus) |
| 48 | { |
| 49 | struct sdw_cdns *cdns = bus_to_cdns(bus); |
| 50 | struct sdw_intel *sdw = cdns_to_intel(cdns); |
| 51 | |
| 52 | return sdw->link_res->hw_ops->pre_bank_switch(sdw); |
| 53 | } |
| 54 | |
| 55 | static int generic_post_bank_switch(struct sdw_bus *bus) |
| 56 | { |
| 57 | struct sdw_cdns *cdns = bus_to_cdns(bus); |
| 58 | struct sdw_intel *sdw = cdns_to_intel(cdns); |
| 59 | |
| 60 | return sdw->link_res->hw_ops->post_bank_switch(sdw); |
| 61 | } |
| 62 | |
| 63 | static int sdw_master_read_intel_prop(struct sdw_bus *bus) |
| 64 | { |
| 65 | struct sdw_master_prop *prop = &bus->prop; |
| 66 | struct fwnode_handle *link; |
| 67 | char name[32]; |
| 68 | u32 quirk_mask; |
| 69 | |
| 70 | /* Find master handle */ |
| 71 | snprintf(name, sizeof(name), |
| 72 | "mipi-sdw-link-%d-subproperties", bus->link_id); |
| 73 | |
| 74 | link = device_get_named_child_node(bus->dev, name); |
| 75 | if (!link) { |
| 76 | dev_err(bus->dev, "Master node %s not found\n", name); |
| 77 | return -EIO; |
| 78 | } |
| 79 | |
| 80 | fwnode_property_read_u32(link, |
| 81 | "intel-sdw-ip-clock", |
| 82 | &prop->mclk_freq); |
| 83 | |
| 84 | /* the values reported by BIOS are the 2x clock, not the bus clock */ |
| 85 | prop->mclk_freq /= 2; |
| 86 | |
| 87 | fwnode_property_read_u32(link, |
| 88 | "intel-quirk-mask", |
| 89 | &quirk_mask); |
| 90 | |
| 91 | if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE) |
| 92 | prop->hw_disabled = true; |
| 93 | |
| 94 | prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH | |
| 95 | SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY; |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static int intel_prop_read(struct sdw_bus *bus) |
| 101 | { |
| 102 | /* Initialize with default handler to read all DisCo properties */ |
| 103 | sdw_master_read_prop(bus); |
| 104 | |
| 105 | /* read Intel-specific properties */ |
| 106 | sdw_master_read_intel_prop(bus); |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static struct sdw_master_ops sdw_intel_ops = { |
| 112 | .read_prop = intel_prop_read, |
| 113 | .override_adr = sdw_dmi_override_adr, |
| 114 | .xfer_msg = cdns_xfer_msg, |
| 115 | .xfer_msg_defer = cdns_xfer_msg_defer, |
| 116 | .reset_page_addr = cdns_reset_page_addr, |
| 117 | .set_bus_conf = cdns_bus_conf, |
| 118 | .pre_bank_switch = generic_pre_bank_switch, |
| 119 | .post_bank_switch = generic_post_bank_switch, |
| 120 | .read_ping_status = cdns_read_ping_status, |
| 121 | }; |
| 122 | |
| 123 | /* |
| 124 | * probe and init (aux_dev_id argument is required by function prototype but not used) |
| 125 | */ |
| 126 | static int intel_link_probe(struct auxiliary_device *auxdev, |
| 127 | const struct auxiliary_device_id *aux_dev_id) |
| 128 | |
| 129 | { |
| 130 | struct device *dev = &auxdev->dev; |
| 131 | struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev); |
| 132 | struct sdw_intel *sdw; |
| 133 | struct sdw_cdns *cdns; |
| 134 | struct sdw_bus *bus; |
| 135 | int ret; |
| 136 | |
| 137 | sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL); |
| 138 | if (!sdw) |
| 139 | return -ENOMEM; |
| 140 | |
| 141 | cdns = &sdw->cdns; |
| 142 | bus = &cdns->bus; |
| 143 | |
| 144 | sdw->instance = auxdev->id; |
| 145 | sdw->link_res = &ldev->link_res; |
| 146 | cdns->dev = dev; |
| 147 | cdns->registers = sdw->link_res->registers; |
| 148 | cdns->instance = sdw->instance; |
| 149 | cdns->msg_count = 0; |
| 150 | |
| 151 | bus->link_id = auxdev->id; |
| 152 | bus->dev_num_ida_min = INTEL_DEV_NUM_IDA_MIN; |
| 153 | bus->clk_stop_timeout = 1; |
| 154 | |
| 155 | sdw_cdns_probe(cdns); |
| 156 | |
| 157 | /* Set ops */ |
| 158 | bus->ops = &sdw_intel_ops; |
| 159 | |
| 160 | /* set driver data, accessed by snd_soc_dai_get_drvdata() */ |
| 161 | auxiliary_set_drvdata(auxdev, cdns); |
| 162 | |
| 163 | /* use generic bandwidth allocation algorithm */ |
| 164 | sdw->cdns.bus.compute_params = sdw_compute_params; |
| 165 | |
| 166 | /* avoid resuming from pm_runtime suspend if it's not required */ |
| 167 | dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND); |
| 168 | |
| 169 | ret = sdw_bus_master_add(bus, dev, dev->fwnode); |
| 170 | if (ret) { |
| 171 | dev_err(dev, "sdw_bus_master_add fail: %d\n", ret); |
| 172 | return ret; |
| 173 | } |
| 174 | |
| 175 | if (bus->prop.hw_disabled) |
| 176 | dev_info(dev, |
| 177 | "SoundWire master %d is disabled, will be ignored\n", |
| 178 | bus->link_id); |
| 179 | /* |
| 180 | * Ignore BIOS err_threshold, it's a really bad idea when dealing |
| 181 | * with multiple hardware synchronized links |
| 182 | */ |
| 183 | bus->prop.err_threshold = 0; |
| 184 | |
| 185 | return 0; |
| 186 | } |
| 187 | |
| 188 | int intel_link_startup(struct auxiliary_device *auxdev) |
| 189 | { |
| 190 | struct device *dev = &auxdev->dev; |
| 191 | struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev); |
| 192 | struct sdw_intel *sdw = cdns_to_intel(cdns); |
| 193 | struct sdw_bus *bus = &cdns->bus; |
| 194 | int link_flags; |
| 195 | bool multi_link; |
| 196 | u32 clock_stop_quirks; |
| 197 | int ret; |
| 198 | |
| 199 | if (bus->prop.hw_disabled) { |
| 200 | dev_info(dev, |
| 201 | "SoundWire master %d is disabled, ignoring\n", |
| 202 | sdw->instance); |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | link_flags = md_flags >> (bus->link_id * 8); |
| 207 | multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK); |
| 208 | if (!multi_link) { |
| 209 | dev_dbg(dev, "Multi-link is disabled\n"); |
| 210 | } else { |
| 211 | /* |
| 212 | * hardware-based synchronization is required regardless |
| 213 | * of the number of segments used by a stream: SSP-based |
| 214 | * synchronization is gated by gsync when the multi-master |
| 215 | * mode is set. |
| 216 | */ |
| 217 | bus->hw_sync_min_links = 1; |
| 218 | } |
| 219 | bus->multi_link = multi_link; |
| 220 | |
| 221 | /* Initialize shim, controller */ |
| 222 | ret = sdw_intel_link_power_up(sdw); |
| 223 | if (ret) |
| 224 | goto err_init; |
| 225 | |
| 226 | /* Register DAIs */ |
| 227 | ret = sdw_intel_register_dai(sdw); |
| 228 | if (ret) { |
| 229 | dev_err(dev, "DAI registration failed: %d\n", ret); |
| 230 | goto err_power_up; |
| 231 | } |
| 232 | |
| 233 | sdw_intel_debugfs_init(sdw); |
| 234 | |
| 235 | /* start bus */ |
| 236 | ret = sdw_intel_start_bus(sdw); |
| 237 | if (ret) { |
| 238 | dev_err(dev, "bus start failed: %d\n", ret); |
| 239 | goto err_power_up; |
| 240 | } |
| 241 | |
| 242 | /* Enable runtime PM */ |
| 243 | if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) { |
| 244 | pm_runtime_set_autosuspend_delay(dev, |
| 245 | INTEL_MASTER_SUSPEND_DELAY_MS); |
| 246 | pm_runtime_use_autosuspend(dev); |
| 247 | pm_runtime_mark_last_busy(dev); |
| 248 | |
| 249 | pm_runtime_set_active(dev); |
| 250 | pm_runtime_enable(dev); |
| 251 | } |
| 252 | |
| 253 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; |
| 254 | if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) { |
| 255 | /* |
| 256 | * To keep the clock running we need to prevent |
| 257 | * pm_runtime suspend from happening by increasing the |
| 258 | * reference count. |
| 259 | * This quirk is specified by the parent PCI device in |
| 260 | * case of specific latency requirements. It will have |
| 261 | * no effect if pm_runtime is disabled by the user via |
| 262 | * a module parameter for testing purposes. |
| 263 | */ |
| 264 | pm_runtime_get_noresume(dev); |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | * The runtime PM status of Slave devices is "Unsupported" |
| 269 | * until they report as ATTACHED. If they don't, e.g. because |
| 270 | * there are no Slave devices populated or if the power-on is |
| 271 | * delayed or dependent on a power switch, the Master will |
| 272 | * remain active and prevent its parent from suspending. |
| 273 | * |
| 274 | * Conditionally force the pm_runtime core to re-evaluate the |
| 275 | * Master status in the absence of any Slave activity. A quirk |
| 276 | * is provided to e.g. deal with Slaves that may be powered on |
| 277 | * with a delay. A more complete solution would require the |
| 278 | * definition of Master properties. |
| 279 | */ |
| 280 | if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) |
| 281 | pm_runtime_idle(dev); |
| 282 | |
| 283 | sdw->startup_done = true; |
| 284 | return 0; |
| 285 | |
| 286 | err_power_up: |
| 287 | sdw_intel_link_power_down(sdw); |
| 288 | err_init: |
| 289 | return ret; |
| 290 | } |
| 291 | |
| 292 | static void intel_link_remove(struct auxiliary_device *auxdev) |
| 293 | { |
| 294 | struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev); |
| 295 | struct sdw_intel *sdw = cdns_to_intel(cdns); |
| 296 | struct sdw_bus *bus = &cdns->bus; |
| 297 | |
| 298 | /* |
| 299 | * Since pm_runtime is already disabled, we don't decrease |
| 300 | * the refcount when the clock_stop_quirk is |
| 301 | * SDW_INTEL_CLK_STOP_NOT_ALLOWED |
| 302 | */ |
| 303 | if (!bus->prop.hw_disabled) { |
| 304 | sdw_intel_debugfs_exit(sdw); |
| 305 | sdw_cdns_enable_interrupt(cdns, false); |
| 306 | } |
| 307 | sdw_bus_master_delete(bus); |
| 308 | } |
| 309 | |
| 310 | int intel_link_process_wakeen_event(struct auxiliary_device *auxdev) |
| 311 | { |
| 312 | struct device *dev = &auxdev->dev; |
| 313 | struct sdw_intel *sdw; |
| 314 | struct sdw_bus *bus; |
| 315 | |
| 316 | sdw = auxiliary_get_drvdata(auxdev); |
| 317 | bus = &sdw->cdns.bus; |
| 318 | |
| 319 | if (bus->prop.hw_disabled || !sdw->startup_done) { |
| 320 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", |
| 321 | bus->link_id); |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | if (!sdw_intel_shim_check_wake(sdw)) |
| 326 | return 0; |
| 327 | |
| 328 | /* disable WAKEEN interrupt ASAP to prevent interrupt flood */ |
| 329 | sdw_intel_shim_wake(sdw, false); |
| 330 | |
| 331 | /* |
| 332 | * resume the Master, which will generate a bus reset and result in |
| 333 | * Slaves re-attaching and be re-enumerated. The SoundWire physical |
| 334 | * device which generated the wake will trigger an interrupt, which |
| 335 | * will in turn cause the corresponding Linux Slave device to be |
| 336 | * resumed and the Slave codec driver to check the status. |
| 337 | */ |
| 338 | pm_request_resume(dev); |
| 339 | |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | /* |
| 344 | * PM calls |
| 345 | */ |
| 346 | |
| 347 | static int intel_resume_child_device(struct device *dev, void *data) |
| 348 | { |
| 349 | int ret; |
| 350 | struct sdw_slave *slave = dev_to_sdw_dev(dev); |
| 351 | |
| 352 | if (!slave->probed) { |
| 353 | dev_dbg(dev, "skipping device, no probed driver\n"); |
| 354 | return 0; |
| 355 | } |
| 356 | if (!slave->dev_num_sticky) { |
| 357 | dev_dbg(dev, "skipping device, never detected on bus\n"); |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | ret = pm_request_resume(dev); |
| 362 | if (ret < 0) |
| 363 | dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret); |
| 364 | |
| 365 | return ret; |
| 366 | } |
| 367 | |
| 368 | static int __maybe_unused intel_pm_prepare(struct device *dev) |
| 369 | { |
| 370 | struct sdw_cdns *cdns = dev_get_drvdata(dev); |
| 371 | struct sdw_intel *sdw = cdns_to_intel(cdns); |
| 372 | struct sdw_bus *bus = &cdns->bus; |
| 373 | u32 clock_stop_quirks; |
| 374 | int ret; |
| 375 | |
| 376 | if (bus->prop.hw_disabled || !sdw->startup_done) { |
| 377 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", |
| 378 | bus->link_id); |
| 379 | return 0; |
| 380 | } |
| 381 | |
| 382 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; |
| 383 | |
| 384 | if (pm_runtime_suspended(dev) && |
| 385 | pm_runtime_suspended(dev->parent) && |
| 386 | ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) || |
| 387 | !clock_stop_quirks)) { |
| 388 | /* |
| 389 | * if we've enabled clock stop, and the parent is suspended, the SHIM registers |
| 390 | * are not accessible and the shim wake cannot be disabled. |
| 391 | * The only solution is to resume the entire bus to full power |
| 392 | */ |
| 393 | |
| 394 | /* |
| 395 | * If any operation in this block fails, we keep going since we don't want |
| 396 | * to prevent system suspend from happening and errors should be recoverable |
| 397 | * on resume. |
| 398 | */ |
| 399 | |
| 400 | /* |
| 401 | * first resume the device for this link. This will also by construction |
| 402 | * resume the PCI parent device. |
| 403 | */ |
| 404 | ret = pm_request_resume(dev); |
| 405 | if (ret < 0) { |
| 406 | dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret); |
| 407 | return 0; |
| 408 | } |
| 409 | |
| 410 | /* |
| 411 | * Continue resuming the entire bus (parent + child devices) to exit |
| 412 | * the clock stop mode. If there are no devices connected on this link |
| 413 | * this is a no-op. |
| 414 | * The resume to full power could have been implemented with a .prepare |
| 415 | * step in SoundWire codec drivers. This would however require a lot |
| 416 | * of code to handle an Intel-specific corner case. It is simpler in |
| 417 | * practice to add a loop at the link level. |
| 418 | */ |
| 419 | ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device); |
| 420 | |
| 421 | if (ret < 0) |
| 422 | dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret); |
| 423 | } |
| 424 | |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | static int __maybe_unused intel_suspend(struct device *dev) |
| 429 | { |
| 430 | struct sdw_cdns *cdns = dev_get_drvdata(dev); |
| 431 | struct sdw_intel *sdw = cdns_to_intel(cdns); |
| 432 | struct sdw_bus *bus = &cdns->bus; |
| 433 | u32 clock_stop_quirks; |
| 434 | int ret; |
| 435 | |
| 436 | if (bus->prop.hw_disabled || !sdw->startup_done) { |
| 437 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", |
| 438 | bus->link_id); |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | if (pm_runtime_suspended(dev)) { |
| 443 | dev_dbg(dev, "pm_runtime status: suspended\n"); |
| 444 | |
| 445 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; |
| 446 | |
| 447 | if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) || |
| 448 | !clock_stop_quirks) { |
| 449 | |
| 450 | if (pm_runtime_suspended(dev->parent)) { |
| 451 | /* |
| 452 | * paranoia check: this should not happen with the .prepare |
| 453 | * resume to full power |
| 454 | */ |
| 455 | dev_err(dev, "%s: invalid config: parent is suspended\n", __func__); |
| 456 | } else { |
| 457 | sdw_intel_shim_wake(sdw, false); |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | return 0; |
| 462 | } |
| 463 | |
| 464 | ret = sdw_intel_stop_bus(sdw, false); |
| 465 | if (ret < 0) { |
| 466 | dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret); |
| 467 | return ret; |
| 468 | } |
| 469 | |
| 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | static int __maybe_unused intel_suspend_runtime(struct device *dev) |
| 474 | { |
| 475 | struct sdw_cdns *cdns = dev_get_drvdata(dev); |
| 476 | struct sdw_intel *sdw = cdns_to_intel(cdns); |
| 477 | struct sdw_bus *bus = &cdns->bus; |
| 478 | u32 clock_stop_quirks; |
| 479 | int ret; |
| 480 | |
| 481 | if (bus->prop.hw_disabled || !sdw->startup_done) { |
| 482 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", |
| 483 | bus->link_id); |
| 484 | return 0; |
| 485 | } |
| 486 | |
| 487 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; |
| 488 | |
| 489 | if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) { |
| 490 | ret = sdw_intel_stop_bus(sdw, false); |
| 491 | if (ret < 0) { |
| 492 | dev_err(dev, "%s: cannot stop bus during teardown: %d\n", |
| 493 | __func__, ret); |
| 494 | return ret; |
| 495 | } |
| 496 | } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) { |
| 497 | ret = sdw_intel_stop_bus(sdw, true); |
| 498 | if (ret < 0) { |
| 499 | dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n", |
| 500 | __func__, ret); |
| 501 | return ret; |
| 502 | } |
| 503 | } else { |
| 504 | dev_err(dev, "%s clock_stop_quirks %x unsupported\n", |
| 505 | __func__, clock_stop_quirks); |
| 506 | ret = -EINVAL; |
| 507 | } |
| 508 | |
| 509 | return ret; |
| 510 | } |
| 511 | |
| 512 | static int __maybe_unused intel_resume(struct device *dev) |
| 513 | { |
| 514 | struct sdw_cdns *cdns = dev_get_drvdata(dev); |
| 515 | struct sdw_intel *sdw = cdns_to_intel(cdns); |
| 516 | struct sdw_bus *bus = &cdns->bus; |
| 517 | int link_flags; |
| 518 | int ret; |
| 519 | |
| 520 | if (bus->prop.hw_disabled || !sdw->startup_done) { |
| 521 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", |
| 522 | bus->link_id); |
| 523 | return 0; |
| 524 | } |
| 525 | |
| 526 | link_flags = md_flags >> (bus->link_id * 8); |
| 527 | |
| 528 | if (pm_runtime_suspended(dev)) { |
| 529 | dev_dbg(dev, "pm_runtime status was suspended, forcing active\n"); |
| 530 | |
| 531 | /* follow required sequence from runtime_pm.rst */ |
| 532 | pm_runtime_disable(dev); |
| 533 | pm_runtime_set_active(dev); |
| 534 | pm_runtime_mark_last_busy(dev); |
| 535 | pm_runtime_enable(dev); |
| 536 | |
| 537 | link_flags = md_flags >> (bus->link_id * 8); |
| 538 | |
| 539 | if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) |
| 540 | pm_runtime_idle(dev); |
| 541 | } |
| 542 | |
| 543 | ret = sdw_intel_link_power_up(sdw); |
| 544 | if (ret) { |
| 545 | dev_err(dev, "%s failed: %d\n", __func__, ret); |
| 546 | return ret; |
| 547 | } |
| 548 | |
| 549 | /* |
| 550 | * make sure all Slaves are tagged as UNATTACHED and provide |
| 551 | * reason for reinitialization |
| 552 | */ |
| 553 | sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); |
| 554 | |
| 555 | ret = sdw_intel_start_bus(sdw); |
| 556 | if (ret < 0) { |
| 557 | dev_err(dev, "cannot start bus during resume\n"); |
| 558 | sdw_intel_link_power_down(sdw); |
| 559 | return ret; |
| 560 | } |
| 561 | |
| 562 | /* |
| 563 | * after system resume, the pm_runtime suspend() may kick in |
| 564 | * during the enumeration, before any children device force the |
| 565 | * master device to remain active. Using pm_runtime_get() |
| 566 | * routines is not really possible, since it'd prevent the |
| 567 | * master from suspending. |
| 568 | * A reasonable compromise is to update the pm_runtime |
| 569 | * counters and delay the pm_runtime suspend by several |
| 570 | * seconds, by when all enumeration should be complete. |
| 571 | */ |
| 572 | pm_runtime_mark_last_busy(dev); |
| 573 | |
| 574 | return 0; |
| 575 | } |
| 576 | |
| 577 | static int __maybe_unused intel_resume_runtime(struct device *dev) |
| 578 | { |
| 579 | struct sdw_cdns *cdns = dev_get_drvdata(dev); |
| 580 | struct sdw_intel *sdw = cdns_to_intel(cdns); |
| 581 | struct sdw_bus *bus = &cdns->bus; |
| 582 | u32 clock_stop_quirks; |
| 583 | int ret; |
| 584 | |
| 585 | if (bus->prop.hw_disabled || !sdw->startup_done) { |
| 586 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", |
| 587 | bus->link_id); |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | /* unconditionally disable WAKEEN interrupt */ |
| 592 | sdw_intel_shim_wake(sdw, false); |
| 593 | |
| 594 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; |
| 595 | |
| 596 | if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) { |
| 597 | ret = sdw_intel_link_power_up(sdw); |
| 598 | if (ret) { |
| 599 | dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret); |
| 600 | return ret; |
| 601 | } |
| 602 | |
| 603 | /* |
| 604 | * make sure all Slaves are tagged as UNATTACHED and provide |
| 605 | * reason for reinitialization |
| 606 | */ |
| 607 | sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); |
| 608 | |
| 609 | ret = sdw_intel_start_bus(sdw); |
| 610 | if (ret < 0) { |
| 611 | dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret); |
| 612 | sdw_intel_link_power_down(sdw); |
| 613 | return ret; |
| 614 | } |
| 615 | |
| 616 | } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) { |
| 617 | ret = sdw_intel_link_power_up(sdw); |
| 618 | if (ret) { |
| 619 | dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret); |
| 620 | return ret; |
| 621 | } |
| 622 | |
| 623 | ret = sdw_intel_start_bus_after_reset(sdw); |
| 624 | if (ret < 0) { |
| 625 | dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret); |
| 626 | sdw_intel_link_power_down(sdw); |
| 627 | return ret; |
| 628 | } |
| 629 | } else if (!clock_stop_quirks) { |
| 630 | |
| 631 | sdw_intel_check_clock_stop(sdw); |
| 632 | |
| 633 | ret = sdw_intel_link_power_up(sdw); |
| 634 | if (ret) { |
| 635 | dev_err(dev, "%s: power_up failed: %d\n", __func__, ret); |
| 636 | return ret; |
| 637 | } |
| 638 | |
| 639 | ret = sdw_intel_start_bus_after_clock_stop(sdw); |
| 640 | if (ret < 0) { |
| 641 | dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret); |
| 642 | sdw_intel_link_power_down(sdw); |
| 643 | return ret; |
| 644 | } |
| 645 | } else { |
| 646 | dev_err(dev, "%s: clock_stop_quirks %x unsupported\n", |
| 647 | __func__, clock_stop_quirks); |
| 648 | ret = -EINVAL; |
| 649 | } |
| 650 | |
| 651 | return ret; |
| 652 | } |
| 653 | |
| 654 | static const struct dev_pm_ops intel_pm = { |
| 655 | .prepare = intel_pm_prepare, |
| 656 | SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume) |
| 657 | SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL) |
| 658 | }; |
| 659 | |
| 660 | static const struct auxiliary_device_id intel_link_id_table[] = { |
| 661 | { .name = "soundwire_intel.link" }, |
| 662 | {}, |
| 663 | }; |
| 664 | MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table); |
| 665 | |
| 666 | static struct auxiliary_driver sdw_intel_drv = { |
| 667 | .probe = intel_link_probe, |
| 668 | .remove = intel_link_remove, |
| 669 | .driver = { |
| 670 | /* auxiliary_driver_register() sets .name to be the modname */ |
| 671 | .pm = &intel_pm, |
| 672 | }, |
| 673 | .id_table = intel_link_id_table |
| 674 | }; |
| 675 | module_auxiliary_driver(sdw_intel_drv); |
| 676 | |
| 677 | MODULE_LICENSE("Dual BSD/GPL"); |
| 678 | MODULE_DESCRIPTION("Intel Soundwire Link Driver"); |