| /* |
| * Copyright 2016 Advanced Micro Devices, Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: AMD |
| * |
| */ |
| |
| #include <linux/slab.h> |
| |
| #include "dm_services.h" |
| #include "dc.h" |
| #include "mod_freesync.h" |
| #include "core_types.h" |
| |
| #define MOD_FREESYNC_MAX_CONCURRENT_STREAMS 32 |
| |
| #define MIN_REFRESH_RANGE 10 |
| /* Refresh rate ramp at a fixed rate of 65 Hz/second */ |
| #define STATIC_SCREEN_RAMP_DELTA_REFRESH_RATE_PER_FRAME ((1000 / 60) * 65) |
| /* Number of elements in the render times cache array */ |
| #define RENDER_TIMES_MAX_COUNT 10 |
| /* Threshold to exit/exit BTR (to avoid frequent enter-exits at the lower limit) */ |
| #define BTR_MAX_MARGIN 2500 |
| /* Threshold to change BTR multiplier (to avoid frequent changes) */ |
| #define BTR_DRIFT_MARGIN 2000 |
| /*Threshold to exit fixed refresh rate*/ |
| #define FIXED_REFRESH_EXIT_MARGIN_IN_HZ 4 |
| /* Number of consecutive frames to check before entering/exiting fixed refresh*/ |
| #define FIXED_REFRESH_ENTER_FRAME_COUNT 5 |
| #define FIXED_REFRESH_EXIT_FRAME_COUNT 5 |
| |
| struct core_freesync { |
| struct mod_freesync public; |
| struct dc *dc; |
| }; |
| |
| #define MOD_FREESYNC_TO_CORE(mod_freesync)\ |
| container_of(mod_freesync, struct core_freesync, public) |
| |
| struct mod_freesync *mod_freesync_create(struct dc *dc) |
| { |
| struct core_freesync *core_freesync = |
| kzalloc(sizeof(struct core_freesync), GFP_KERNEL); |
| |
| if (core_freesync == NULL) |
| goto fail_alloc_context; |
| |
| if (dc == NULL) |
| goto fail_construct; |
| |
| core_freesync->dc = dc; |
| return &core_freesync->public; |
| |
| fail_construct: |
| kfree(core_freesync); |
| |
| fail_alloc_context: |
| return NULL; |
| } |
| |
| void mod_freesync_destroy(struct mod_freesync *mod_freesync) |
| { |
| struct core_freesync *core_freesync = NULL; |
| if (mod_freesync == NULL) |
| return; |
| core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync); |
| kfree(core_freesync); |
| } |
| |
| #if 0 /* unused currently */ |
| static unsigned int calc_refresh_in_uhz_from_duration( |
| unsigned int duration_in_ns) |
| { |
| unsigned int refresh_in_uhz = |
| ((unsigned int)(div64_u64((1000000000ULL * 1000000), |
| duration_in_ns))); |
| return refresh_in_uhz; |
| } |
| #endif |
| |
| static unsigned int calc_duration_in_us_from_refresh_in_uhz( |
| unsigned int refresh_in_uhz) |
| { |
| unsigned int duration_in_us = |
| ((unsigned int)(div64_u64((1000000000ULL * 1000), |
| refresh_in_uhz))); |
| return duration_in_us; |
| } |
| |
| static unsigned int calc_duration_in_us_from_v_total( |
| const struct dc_stream_state *stream, |
| const struct mod_vrr_params *in_vrr, |
| unsigned int v_total) |
| { |
| unsigned int duration_in_us = |
| (unsigned int)(div64_u64(((unsigned long long)(v_total) |
| * 10000) * stream->timing.h_total, |
| stream->timing.pix_clk_100hz)); |
| |
| return duration_in_us; |
| } |
| |
| static unsigned int calc_v_total_from_refresh( |
| const struct dc_stream_state *stream, |
| unsigned int refresh_in_uhz) |
| { |
| unsigned int v_total; |
| unsigned int frame_duration_in_ns; |
| |
| frame_duration_in_ns = |
| ((unsigned int)(div64_u64((1000000000ULL * 1000000), |
| refresh_in_uhz))); |
| |
| v_total = div64_u64(div64_u64(((unsigned long long)( |
| frame_duration_in_ns) * (stream->timing.pix_clk_100hz / 10)), |
| stream->timing.h_total), 1000000); |
| |
| /* v_total cannot be less than nominal */ |
| if (v_total < stream->timing.v_total) { |
| ASSERT(v_total < stream->timing.v_total); |
| v_total = stream->timing.v_total; |
| } |
| |
| return v_total; |
| } |
| |
| static unsigned int calc_v_total_from_duration( |
| const struct dc_stream_state *stream, |
| const struct mod_vrr_params *vrr, |
| unsigned int duration_in_us) |
| { |
| unsigned int v_total = 0; |
| |
| if (duration_in_us < vrr->min_duration_in_us) |
| duration_in_us = vrr->min_duration_in_us; |
| |
| if (duration_in_us > vrr->max_duration_in_us) |
| duration_in_us = vrr->max_duration_in_us; |
| |
| v_total = div64_u64(div64_u64(((unsigned long long)( |
| duration_in_us) * (stream->timing.pix_clk_100hz / 10)), |
| stream->timing.h_total), 1000); |
| |
| /* v_total cannot be less than nominal */ |
| if (v_total < stream->timing.v_total) { |
| ASSERT(v_total < stream->timing.v_total); |
| v_total = stream->timing.v_total; |
| } |
| |
| return v_total; |
| } |
| |
| static void update_v_total_for_static_ramp( |
| struct core_freesync *core_freesync, |
| const struct dc_stream_state *stream, |
| struct mod_vrr_params *in_out_vrr) |
| { |
| unsigned int v_total = 0; |
| unsigned int current_duration_in_us = |
| calc_duration_in_us_from_v_total( |
| stream, in_out_vrr, |
| in_out_vrr->adjust.v_total_max); |
| unsigned int target_duration_in_us = |
| calc_duration_in_us_from_refresh_in_uhz( |
| in_out_vrr->fixed.target_refresh_in_uhz); |
| bool ramp_direction_is_up = (current_duration_in_us > |
| target_duration_in_us) ? true : false; |
| |
| /* Calc ratio between new and current frame duration with 3 digit */ |
| unsigned int frame_duration_ratio = div64_u64(1000000, |
| (1000 + div64_u64(((unsigned long long)( |
| STATIC_SCREEN_RAMP_DELTA_REFRESH_RATE_PER_FRAME) * |
| current_duration_in_us), |
| 1000000))); |
| |
| /* Calculate delta between new and current frame duration in us */ |
| unsigned int frame_duration_delta = div64_u64(((unsigned long long)( |
| current_duration_in_us) * |
| (1000 - frame_duration_ratio)), 1000); |
| |
| /* Adjust frame duration delta based on ratio between current and |
| * standard frame duration (frame duration at 60 Hz refresh rate). |
| */ |
| unsigned int ramp_rate_interpolated = div64_u64(((unsigned long long)( |
| frame_duration_delta) * current_duration_in_us), 16666); |
| |
| /* Going to a higher refresh rate (lower frame duration) */ |
| if (ramp_direction_is_up) { |
| /* reduce frame duration */ |
| current_duration_in_us -= ramp_rate_interpolated; |
| |
| /* adjust for frame duration below min */ |
| if (current_duration_in_us <= target_duration_in_us) { |
| in_out_vrr->fixed.ramping_active = false; |
| in_out_vrr->fixed.ramping_done = true; |
| current_duration_in_us = |
| calc_duration_in_us_from_refresh_in_uhz( |
| in_out_vrr->fixed.target_refresh_in_uhz); |
| } |
| /* Going to a lower refresh rate (larger frame duration) */ |
| } else { |
| /* increase frame duration */ |
| current_duration_in_us += ramp_rate_interpolated; |
| |
| /* adjust for frame duration above max */ |
| if (current_duration_in_us >= target_duration_in_us) { |
| in_out_vrr->fixed.ramping_active = false; |
| in_out_vrr->fixed.ramping_done = true; |
| current_duration_in_us = |
| calc_duration_in_us_from_refresh_in_uhz( |
| in_out_vrr->fixed.target_refresh_in_uhz); |
| } |
| } |
| |
| v_total = div64_u64(div64_u64(((unsigned long long)( |
| current_duration_in_us) * (stream->timing.pix_clk_100hz / 10)), |
| stream->timing.h_total), 1000); |
| |
| /* v_total cannot be less than nominal */ |
| if (v_total < stream->timing.v_total) |
| v_total = stream->timing.v_total; |
| |
| in_out_vrr->adjust.v_total_min = v_total; |
| in_out_vrr->adjust.v_total_max = v_total; |
| } |
| |
| static void apply_below_the_range(struct core_freesync *core_freesync, |
| const struct dc_stream_state *stream, |
| unsigned int last_render_time_in_us, |
| struct mod_vrr_params *in_out_vrr) |
| { |
| unsigned int inserted_frame_duration_in_us = 0; |
| unsigned int mid_point_frames_ceil = 0; |
| unsigned int mid_point_frames_floor = 0; |
| unsigned int frame_time_in_us = 0; |
| unsigned int delta_from_mid_point_in_us_1 = 0xFFFFFFFF; |
| unsigned int delta_from_mid_point_in_us_2 = 0xFFFFFFFF; |
| unsigned int frames_to_insert = 0; |
| unsigned int delta_from_mid_point_delta_in_us; |
| unsigned int max_render_time_in_us = |
| in_out_vrr->max_duration_in_us - in_out_vrr->btr.margin_in_us; |
| |
| /* Program BTR */ |
| if ((last_render_time_in_us + in_out_vrr->btr.margin_in_us / 2) < max_render_time_in_us) { |
| /* Exit Below the Range */ |
| if (in_out_vrr->btr.btr_active) { |
| in_out_vrr->btr.frame_counter = 0; |
| in_out_vrr->btr.btr_active = false; |
| } |
| } else if (last_render_time_in_us > (max_render_time_in_us + in_out_vrr->btr.margin_in_us / 2)) { |
| /* Enter Below the Range */ |
| if (!in_out_vrr->btr.btr_active) { |
| in_out_vrr->btr.btr_active = true; |
| } |
| } |
| |
| /* BTR set to "not active" so disengage */ |
| if (!in_out_vrr->btr.btr_active) { |
| in_out_vrr->btr.inserted_duration_in_us = 0; |
| in_out_vrr->btr.frames_to_insert = 0; |
| in_out_vrr->btr.frame_counter = 0; |
| |
| /* Restore FreeSync */ |
| in_out_vrr->adjust.v_total_min = |
| calc_v_total_from_refresh(stream, |
| in_out_vrr->max_refresh_in_uhz); |
| in_out_vrr->adjust.v_total_max = |
| calc_v_total_from_refresh(stream, |
| in_out_vrr->min_refresh_in_uhz); |
| /* BTR set to "active" so engage */ |
| } else { |
| |
| /* Calculate number of midPoint frames that could fit within |
| * the render time interval- take ceil of this value |
| */ |
| mid_point_frames_ceil = (last_render_time_in_us + |
| in_out_vrr->btr.mid_point_in_us - 1) / |
| in_out_vrr->btr.mid_point_in_us; |
| |
| if (mid_point_frames_ceil > 0) { |
| frame_time_in_us = last_render_time_in_us / |
| mid_point_frames_ceil; |
| delta_from_mid_point_in_us_1 = |
| (in_out_vrr->btr.mid_point_in_us > |
| frame_time_in_us) ? |
| (in_out_vrr->btr.mid_point_in_us - frame_time_in_us) : |
| (frame_time_in_us - in_out_vrr->btr.mid_point_in_us); |
| } |
| |
| /* Calculate number of midPoint frames that could fit within |
| * the render time interval- take floor of this value |
| */ |
| mid_point_frames_floor = last_render_time_in_us / |
| in_out_vrr->btr.mid_point_in_us; |
| |
| if (mid_point_frames_floor > 0) { |
| |
| frame_time_in_us = last_render_time_in_us / |
| mid_point_frames_floor; |
| delta_from_mid_point_in_us_2 = |
| (in_out_vrr->btr.mid_point_in_us > |
| frame_time_in_us) ? |
| (in_out_vrr->btr.mid_point_in_us - frame_time_in_us) : |
| (frame_time_in_us - in_out_vrr->btr.mid_point_in_us); |
| } |
| |
| /* Choose number of frames to insert based on how close it |
| * can get to the mid point of the variable range. |
| * - Delta for CEIL: delta_from_mid_point_in_us_1 |
| * - Delta for FLOOR: delta_from_mid_point_in_us_2 |
| */ |
| if ((last_render_time_in_us / mid_point_frames_ceil) < in_out_vrr->min_duration_in_us) { |
| /* Check for out of range. |
| * If using CEIL produces a value that is out of range, |
| * then we are forced to use FLOOR. |
| */ |
| frames_to_insert = mid_point_frames_floor; |
| } else if (mid_point_frames_floor < 2) { |
| /* Check if FLOOR would result in non-LFC. In this case |
| * choose to use CEIL |
| */ |
| frames_to_insert = mid_point_frames_ceil; |
| } else if (delta_from_mid_point_in_us_1 < delta_from_mid_point_in_us_2) { |
| /* If choosing CEIL results in a frame duration that is |
| * closer to the mid point of the range. |
| * Choose CEIL |
| */ |
| frames_to_insert = mid_point_frames_ceil; |
| } else { |
| /* If choosing FLOOR results in a frame duration that is |
| * closer to the mid point of the range. |
| * Choose FLOOR |
| */ |
| frames_to_insert = mid_point_frames_floor; |
| } |
| |
| /* Prefer current frame multiplier when BTR is enabled unless it drifts |
| * too far from the midpoint |
| */ |
| if (delta_from_mid_point_in_us_1 < delta_from_mid_point_in_us_2) { |
| delta_from_mid_point_delta_in_us = delta_from_mid_point_in_us_2 - |
| delta_from_mid_point_in_us_1; |
| } else { |
| delta_from_mid_point_delta_in_us = delta_from_mid_point_in_us_1 - |
| delta_from_mid_point_in_us_2; |
| } |
| if (in_out_vrr->btr.frames_to_insert != 0 && |
| delta_from_mid_point_delta_in_us < BTR_DRIFT_MARGIN) { |
| if (((last_render_time_in_us / in_out_vrr->btr.frames_to_insert) < |
| max_render_time_in_us) && |
| ((last_render_time_in_us / in_out_vrr->btr.frames_to_insert) > |
| in_out_vrr->min_duration_in_us)) |
| frames_to_insert = in_out_vrr->btr.frames_to_insert; |
| } |
| |
| /* Either we've calculated the number of frames to insert, |
| * or we need to insert min duration frames |
| */ |
| if (last_render_time_in_us / frames_to_insert < |
| in_out_vrr->min_duration_in_us){ |
| frames_to_insert -= (frames_to_insert > 1) ? |
| 1 : 0; |
| } |
| |
| if (frames_to_insert > 0) |
| inserted_frame_duration_in_us = last_render_time_in_us / |
| frames_to_insert; |
| |
| if (inserted_frame_duration_in_us < in_out_vrr->min_duration_in_us) |
| inserted_frame_duration_in_us = in_out_vrr->min_duration_in_us; |
| |
| /* Cache the calculated variables */ |
| in_out_vrr->btr.inserted_duration_in_us = |
| inserted_frame_duration_in_us; |
| in_out_vrr->btr.frames_to_insert = frames_to_insert; |
| in_out_vrr->btr.frame_counter = frames_to_insert; |
| } |
| } |
| |
| static void apply_fixed_refresh(struct core_freesync *core_freesync, |
| const struct dc_stream_state *stream, |
| unsigned int last_render_time_in_us, |
| struct mod_vrr_params *in_out_vrr) |
| { |
| bool update = false; |
| unsigned int max_render_time_in_us = in_out_vrr->max_duration_in_us; |
| |
| /* Compute the exit refresh rate and exit frame duration */ |
| unsigned int exit_refresh_rate_in_milli_hz = ((1000000000/max_render_time_in_us) |
| + (1000*FIXED_REFRESH_EXIT_MARGIN_IN_HZ)); |
| unsigned int exit_frame_duration_in_us = 1000000000/exit_refresh_rate_in_milli_hz; |
| |
| if (last_render_time_in_us < exit_frame_duration_in_us) { |
| /* Exit Fixed Refresh mode */ |
| if (in_out_vrr->fixed.fixed_active) { |
| in_out_vrr->fixed.frame_counter++; |
| |
| if (in_out_vrr->fixed.frame_counter > |
| FIXED_REFRESH_EXIT_FRAME_COUNT) { |
| in_out_vrr->fixed.frame_counter = 0; |
| in_out_vrr->fixed.fixed_active = false; |
| in_out_vrr->fixed.target_refresh_in_uhz = 0; |
| update = true; |
| } |
| } |
| } else if (last_render_time_in_us > max_render_time_in_us) { |
| /* Enter Fixed Refresh mode */ |
| if (!in_out_vrr->fixed.fixed_active) { |
| in_out_vrr->fixed.frame_counter++; |
| |
| if (in_out_vrr->fixed.frame_counter > |
| FIXED_REFRESH_ENTER_FRAME_COUNT) { |
| in_out_vrr->fixed.frame_counter = 0; |
| in_out_vrr->fixed.fixed_active = true; |
| in_out_vrr->fixed.target_refresh_in_uhz = |
| in_out_vrr->max_refresh_in_uhz; |
| update = true; |
| } |
| } |
| } |
| |
| if (update) { |
| if (in_out_vrr->fixed.fixed_active) { |
| in_out_vrr->adjust.v_total_min = |
| calc_v_total_from_refresh( |
| stream, in_out_vrr->max_refresh_in_uhz); |
| in_out_vrr->adjust.v_total_max = |
| in_out_vrr->adjust.v_total_min; |
| } else { |
| in_out_vrr->adjust.v_total_min = |
| calc_v_total_from_refresh(stream, |
| in_out_vrr->max_refresh_in_uhz); |
| in_out_vrr->adjust.v_total_max = |
| calc_v_total_from_refresh(stream, |
| in_out_vrr->min_refresh_in_uhz); |
| } |
| } |
| } |
| |
| static bool vrr_settings_require_update(struct core_freesync *core_freesync, |
| struct mod_freesync_config *in_config, |
| unsigned int min_refresh_in_uhz, |
| unsigned int max_refresh_in_uhz, |
| struct mod_vrr_params *in_vrr) |
| { |
| if (in_vrr->state != in_config->state) { |
| return true; |
| } else if (in_vrr->state == VRR_STATE_ACTIVE_FIXED && |
| in_vrr->fixed.target_refresh_in_uhz != |
| in_config->fixed_refresh_in_uhz) { |
| return true; |
| } else if (in_vrr->min_refresh_in_uhz != min_refresh_in_uhz) { |
| return true; |
| } else if (in_vrr->max_refresh_in_uhz != max_refresh_in_uhz) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool mod_freesync_get_vmin_vmax(struct mod_freesync *mod_freesync, |
| const struct dc_stream_state *stream, |
| unsigned int *vmin, |
| unsigned int *vmax) |
| { |
| *vmin = stream->adjust.v_total_min; |
| *vmax = stream->adjust.v_total_max; |
| |
| return true; |
| } |
| |
| bool mod_freesync_get_v_position(struct mod_freesync *mod_freesync, |
| struct dc_stream_state *stream, |
| unsigned int *nom_v_pos, |
| unsigned int *v_pos) |
| { |
| struct core_freesync *core_freesync = NULL; |
| struct crtc_position position; |
| |
| if (mod_freesync == NULL) |
| return false; |
| |
| core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync); |
| |
| if (dc_stream_get_crtc_position(core_freesync->dc, &stream, 1, |
| &position.vertical_count, |
| &position.nominal_vcount)) { |
| |
| *nom_v_pos = position.nominal_vcount; |
| *v_pos = position.vertical_count; |
| |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static void build_vrr_infopacket_data_v1(const struct mod_vrr_params *vrr, |
| struct dc_info_packet *infopacket) |
| { |
| /* PB1 = 0x1A (24bit AMD IEEE OUI (0x00001A) - Byte 0) */ |
| infopacket->sb[1] = 0x1A; |
| |
| /* PB2 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 1) */ |
| infopacket->sb[2] = 0x00; |
| |
| /* PB3 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 2) */ |
| infopacket->sb[3] = 0x00; |
| |
| /* PB4 = Reserved */ |
| |
| /* PB5 = Reserved */ |
| |
| /* PB6 = [Bits 7:3 = Reserved] */ |
| |
| /* PB6 = [Bit 0 = FreeSync Supported] */ |
| if (vrr->state != VRR_STATE_UNSUPPORTED) |
| infopacket->sb[6] |= 0x01; |
| |
| /* PB6 = [Bit 1 = FreeSync Enabled] */ |
| if (vrr->state != VRR_STATE_DISABLED && |
| vrr->state != VRR_STATE_UNSUPPORTED) |
| infopacket->sb[6] |= 0x02; |
| |
| /* PB6 = [Bit 2 = FreeSync Active] */ |
| if (vrr->state == VRR_STATE_ACTIVE_VARIABLE || |
| vrr->state == VRR_STATE_ACTIVE_FIXED) |
| infopacket->sb[6] |= 0x04; |
| |
| // For v1 & 2 infoframes program nominal if non-fs mode, otherwise full range |
| /* PB7 = FreeSync Minimum refresh rate (Hz) */ |
| if (vrr->state == VRR_STATE_ACTIVE_VARIABLE || |
| vrr->state == VRR_STATE_ACTIVE_FIXED) { |
| infopacket->sb[7] = (unsigned char)((vrr->min_refresh_in_uhz + 500000) / 1000000); |
| } else { |
| infopacket->sb[7] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000); |
| } |
| |
| /* PB8 = FreeSync Maximum refresh rate (Hz) |
| * Note: We should never go above the field rate of the mode timing set. |
| */ |
| infopacket->sb[8] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000); |
| |
| //FreeSync HDR |
| infopacket->sb[9] = 0; |
| infopacket->sb[10] = 0; |
| } |
| |
| static void build_vrr_infopacket_data_v3(const struct mod_vrr_params *vrr, |
| struct dc_info_packet *infopacket) |
| { |
| /* PB1 = 0x1A (24bit AMD IEEE OUI (0x00001A) - Byte 0) */ |
| infopacket->sb[1] = 0x1A; |
| |
| /* PB2 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 1) */ |
| infopacket->sb[2] = 0x00; |
| |
| /* PB3 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 2) */ |
| infopacket->sb[3] = 0x00; |
| |
| /* PB4 = Reserved */ |
| |
| /* PB5 = Reserved */ |
| |
| /* PB6 = [Bits 7:3 = Reserved] */ |
| |
| /* PB6 = [Bit 0 = FreeSync Supported] */ |
| if (vrr->state != VRR_STATE_UNSUPPORTED) |
| infopacket->sb[6] |= 0x01; |
| |
| /* PB6 = [Bit 1 = FreeSync Enabled] */ |
| if (vrr->state != VRR_STATE_DISABLED && |
| vrr->state != VRR_STATE_UNSUPPORTED) |
| infopacket->sb[6] |= 0x02; |
| |
| /* PB6 = [Bit 2 = FreeSync Active] */ |
| if (vrr->state == VRR_STATE_ACTIVE_VARIABLE || |
| vrr->state == VRR_STATE_ACTIVE_FIXED) |
| infopacket->sb[6] |= 0x04; |
| |
| if (vrr->state == VRR_STATE_ACTIVE_FIXED) { |
| /* PB7 = FreeSync Minimum refresh rate (Hz) */ |
| infopacket->sb[7] = (unsigned char)((vrr->fixed_refresh_in_uhz + 500000) / 1000000); |
| /* PB8 = FreeSync Maximum refresh rate (Hz) */ |
| infopacket->sb[8] = (unsigned char)((vrr->fixed_refresh_in_uhz + 500000) / 1000000); |
| } else if (vrr->state == VRR_STATE_ACTIVE_VARIABLE) { |
| /* PB7 = FreeSync Minimum refresh rate (Hz) */ |
| infopacket->sb[7] = (unsigned char)((vrr->min_refresh_in_uhz + 500000) / 1000000); |
| /* PB8 = FreeSync Maximum refresh rate (Hz) */ |
| infopacket->sb[8] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000); |
| } else { |
| // Non-fs case, program nominal range |
| /* PB7 = FreeSync Minimum refresh rate (Hz) */ |
| infopacket->sb[7] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000); |
| /* PB8 = FreeSync Maximum refresh rate (Hz) */ |
| infopacket->sb[8] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000); |
| } |
| |
| //FreeSync HDR |
| infopacket->sb[9] = 0; |
| infopacket->sb[10] = 0; |
| } |
| |
| static void build_vrr_infopacket_fs2_data(enum color_transfer_func app_tf, |
| struct dc_info_packet *infopacket) |
| { |
| if (app_tf != TRANSFER_FUNC_UNKNOWN) { |
| infopacket->valid = true; |
| |
| infopacket->sb[6] |= 0x08; // PB6 = [Bit 3 = Native Color Active] |
| |
| if (app_tf == TRANSFER_FUNC_GAMMA_22) { |
| infopacket->sb[9] |= 0x04; // PB6 = [Bit 2 = Gamma 2.2 EOTF Active] |
| } |
| } |
| } |
| |
| static void build_vrr_infopacket_header_v1(enum signal_type signal, |
| struct dc_info_packet *infopacket, |
| unsigned int *payload_size) |
| { |
| if (dc_is_hdmi_signal(signal)) { |
| |
| /* HEADER */ |
| |
| /* HB0 = Packet Type = 0x83 (Source Product |
| * Descriptor InfoFrame) |
| */ |
| infopacket->hb0 = DC_HDMI_INFOFRAME_TYPE_SPD; |
| |
| /* HB1 = Version = 0x01 */ |
| infopacket->hb1 = 0x01; |
| |
| /* HB2 = [Bits 7:5 = 0] [Bits 4:0 = Length = 0x08] */ |
| infopacket->hb2 = 0x08; |
| |
| *payload_size = 0x08; |
| |
| } else if (dc_is_dp_signal(signal)) { |
| |
| /* HEADER */ |
| |
| /* HB0 = Secondary-data Packet ID = 0 - Only non-zero |
| * when used to associate audio related info packets |
| */ |
| infopacket->hb0 = 0x00; |
| |
| /* HB1 = Packet Type = 0x83 (Source Product |
| * Descriptor InfoFrame) |
| */ |
| infopacket->hb1 = DC_HDMI_INFOFRAME_TYPE_SPD; |
| |
| /* HB2 = [Bits 7:0 = Least significant eight bits - |
| * For INFOFRAME, the value must be 1Bh] |
| */ |
| infopacket->hb2 = 0x1B; |
| |
| /* HB3 = [Bits 7:2 = INFOFRAME SDP Version Number = 0x1] |
| * [Bits 1:0 = Most significant two bits = 0x00] |
| */ |
| infopacket->hb3 = 0x04; |
| |
| *payload_size = 0x1B; |
| } |
| } |
| |
| static void build_vrr_infopacket_header_v2(enum signal_type signal, |
| struct dc_info_packet *infopacket, |
| unsigned int *payload_size) |
| { |
| if (dc_is_hdmi_signal(signal)) { |
| |
| /* HEADER */ |
| |
| /* HB0 = Packet Type = 0x83 (Source Product |
| * Descriptor InfoFrame) |
| */ |
| infopacket->hb0 = DC_HDMI_INFOFRAME_TYPE_SPD; |
| |
| /* HB1 = Version = 0x02 */ |
| infopacket->hb1 = 0x02; |
| |
| /* HB2 = [Bits 7:5 = 0] [Bits 4:0 = Length = 0x09] */ |
| infopacket->hb2 = 0x09; |
| |
| *payload_size = 0x0A; |
| |
| } else if (dc_is_dp_signal(signal)) { |
| |
| /* HEADER */ |
| |
| /* HB0 = Secondary-data Packet ID = 0 - Only non-zero |
| * when used to associate audio related info packets |
| */ |
| infopacket->hb0 = 0x00; |
| |
| /* HB1 = Packet Type = 0x83 (Source Product |
| * Descriptor InfoFrame) |
| */ |
| infopacket->hb1 = DC_HDMI_INFOFRAME_TYPE_SPD; |
| |
| /* HB2 = [Bits 7:0 = Least significant eight bits - |
| * For INFOFRAME, the value must be 1Bh] |
| */ |
| infopacket->hb2 = 0x1B; |
| |
| /* HB3 = [Bits 7:2 = INFOFRAME SDP Version Number = 0x2] |
| * [Bits 1:0 = Most significant two bits = 0x00] |
| */ |
| infopacket->hb3 = 0x08; |
| |
| *payload_size = 0x1B; |
| } |
| } |
| |
| static void build_vrr_infopacket_checksum(unsigned int *payload_size, |
| struct dc_info_packet *infopacket) |
| { |
| /* Calculate checksum */ |
| unsigned int idx = 0; |
| unsigned char checksum = 0; |
| |
| checksum += infopacket->hb0; |
| checksum += infopacket->hb1; |
| checksum += infopacket->hb2; |
| checksum += infopacket->hb3; |
| |
| for (idx = 1; idx <= *payload_size; idx++) |
| checksum += infopacket->sb[idx]; |
| |
| /* PB0 = Checksum (one byte complement) */ |
| infopacket->sb[0] = (unsigned char)(0x100 - checksum); |
| |
| infopacket->valid = true; |
| } |
| |
| static void build_vrr_infopacket_v1(enum signal_type signal, |
| const struct mod_vrr_params *vrr, |
| struct dc_info_packet *infopacket) |
| { |
| /* SPD info packet for FreeSync */ |
| unsigned int payload_size = 0; |
| |
| build_vrr_infopacket_header_v1(signal, infopacket, &payload_size); |
| build_vrr_infopacket_data_v1(vrr, infopacket); |
| build_vrr_infopacket_checksum(&payload_size, infopacket); |
| |
| infopacket->valid = true; |
| } |
| |
| static void build_vrr_infopacket_v2(enum signal_type signal, |
| const struct mod_vrr_params *vrr, |
| enum color_transfer_func app_tf, |
| struct dc_info_packet *infopacket) |
| { |
| unsigned int payload_size = 0; |
| |
| build_vrr_infopacket_header_v2(signal, infopacket, &payload_size); |
| build_vrr_infopacket_data_v1(vrr, infopacket); |
| |
| build_vrr_infopacket_fs2_data(app_tf, infopacket); |
| |
| build_vrr_infopacket_checksum(&payload_size, infopacket); |
| |
| infopacket->valid = true; |
| } |
| #ifndef TRIM_FSFT |
| static void build_vrr_infopacket_fast_transport_data( |
| bool ftActive, |
| unsigned int ftOutputRate, |
| struct dc_info_packet *infopacket) |
| { |
| /* PB9 : bit7 - fast transport Active*/ |
| unsigned char activeBit = (ftActive) ? 1 << 7 : 0; |
| |
| infopacket->sb[1] &= ~activeBit; //clear bit |
| infopacket->sb[1] |= activeBit; //set bit |
| |
| /* PB13 : Target Output Pixel Rate [kHz] - bits 7:0 */ |
| infopacket->sb[13] = ftOutputRate & 0xFF; |
| |
| /* PB14 : Target Output Pixel Rate [kHz] - bits 15:8 */ |
| infopacket->sb[14] = (ftOutputRate >> 8) & 0xFF; |
| |
| /* PB15 : Target Output Pixel Rate [kHz] - bits 23:16 */ |
| infopacket->sb[15] = (ftOutputRate >> 16) & 0xFF; |
| |
| } |
| #endif |
| |
| static void build_vrr_infopacket_v3(enum signal_type signal, |
| const struct mod_vrr_params *vrr, |
| #ifndef TRIM_FSFT |
| bool ftActive, unsigned int ftOutputRate, |
| #endif |
| enum color_transfer_func app_tf, |
| struct dc_info_packet *infopacket) |
| { |
| unsigned int payload_size = 0; |
| |
| build_vrr_infopacket_header_v2(signal, infopacket, &payload_size); |
| build_vrr_infopacket_data_v3(vrr, infopacket); |
| |
| build_vrr_infopacket_fs2_data(app_tf, infopacket); |
| |
| #ifndef TRIM_FSFT |
| build_vrr_infopacket_fast_transport_data( |
| ftActive, |
| ftOutputRate, |
| infopacket); |
| #endif |
| |
| build_vrr_infopacket_checksum(&payload_size, infopacket); |
| |
| infopacket->valid = true; |
| } |
| |
| void mod_freesync_build_vrr_infopacket(struct mod_freesync *mod_freesync, |
| const struct dc_stream_state *stream, |
| const struct mod_vrr_params *vrr, |
| enum vrr_packet_type packet_type, |
| enum color_transfer_func app_tf, |
| struct dc_info_packet *infopacket) |
| { |
| /* SPD info packet for FreeSync |
| * VTEM info packet for HdmiVRR |
| * Check if Freesync is supported. Return if false. If true, |
| * set the corresponding bit in the info packet |
| */ |
| if (!vrr->send_info_frame) |
| return; |
| |
| switch (packet_type) { |
| case PACKET_TYPE_FS_V3: |
| #ifndef TRIM_FSFT |
| // always populate with pixel rate. |
| build_vrr_infopacket_v3( |
| stream->signal, vrr, |
| stream->timing.flags.FAST_TRANSPORT, |
| (stream->timing.flags.FAST_TRANSPORT) ? |
| stream->timing.fast_transport_output_rate_100hz : |
| stream->timing.pix_clk_100hz, |
| app_tf, infopacket); |
| #else |
| build_vrr_infopacket_v3(stream->signal, vrr, app_tf, infopacket); |
| #endif |
| break; |
| case PACKET_TYPE_FS_V2: |
| build_vrr_infopacket_v2(stream->signal, vrr, app_tf, infopacket); |
| break; |
| case PACKET_TYPE_VRR: |
| case PACKET_TYPE_FS_V1: |
| default: |
| build_vrr_infopacket_v1(stream->signal, vrr, infopacket); |
| } |
| } |
| |
| void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync, |
| const struct dc_stream_state *stream, |
| struct mod_freesync_config *in_config, |
| struct mod_vrr_params *in_out_vrr) |
| { |
| struct core_freesync *core_freesync = NULL; |
| unsigned long long nominal_field_rate_in_uhz = 0; |
| unsigned long long rounded_nominal_in_uhz = 0; |
| unsigned int refresh_range = 0; |
| unsigned long long min_refresh_in_uhz = 0; |
| unsigned long long max_refresh_in_uhz = 0; |
| |
| if (mod_freesync == NULL) |
| return; |
| |
| core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync); |
| |
| /* Calculate nominal field rate for stream */ |
| nominal_field_rate_in_uhz = |
| mod_freesync_calc_nominal_field_rate(stream); |
| |
| min_refresh_in_uhz = in_config->min_refresh_in_uhz; |
| max_refresh_in_uhz = in_config->max_refresh_in_uhz; |
| |
| // Full range may be larger than current video timing, so cap at nominal |
| if (max_refresh_in_uhz > nominal_field_rate_in_uhz) |
| max_refresh_in_uhz = nominal_field_rate_in_uhz; |
| |
| // Full range may be larger than current video timing, so cap at nominal |
| if (min_refresh_in_uhz > max_refresh_in_uhz) |
| min_refresh_in_uhz = max_refresh_in_uhz; |
| |
| // If a monitor reports exactly max refresh of 2x of min, enforce it on nominal |
| rounded_nominal_in_uhz = |
| div_u64(nominal_field_rate_in_uhz + 50000, 100000) * 100000; |
| if (in_config->max_refresh_in_uhz == (2 * in_config->min_refresh_in_uhz) && |
| in_config->max_refresh_in_uhz == rounded_nominal_in_uhz) |
| min_refresh_in_uhz = div_u64(nominal_field_rate_in_uhz, 2); |
| |
| if (!vrr_settings_require_update(core_freesync, |
| in_config, (unsigned int)min_refresh_in_uhz, (unsigned int)max_refresh_in_uhz, |
| in_out_vrr)) |
| return; |
| |
| in_out_vrr->state = in_config->state; |
| in_out_vrr->send_info_frame = in_config->vsif_supported; |
| |
| if (in_config->state == VRR_STATE_UNSUPPORTED) { |
| in_out_vrr->state = VRR_STATE_UNSUPPORTED; |
| in_out_vrr->supported = false; |
| in_out_vrr->adjust.v_total_min = stream->timing.v_total; |
| in_out_vrr->adjust.v_total_max = stream->timing.v_total; |
| |
| return; |
| |
| } else { |
| in_out_vrr->min_refresh_in_uhz = (unsigned int)min_refresh_in_uhz; |
| in_out_vrr->max_duration_in_us = |
| calc_duration_in_us_from_refresh_in_uhz( |
| (unsigned int)min_refresh_in_uhz); |
| |
| in_out_vrr->max_refresh_in_uhz = (unsigned int)max_refresh_in_uhz; |
| in_out_vrr->min_duration_in_us = |
| calc_duration_in_us_from_refresh_in_uhz( |
| (unsigned int)max_refresh_in_uhz); |
| |
| if (in_config->state == VRR_STATE_ACTIVE_FIXED) |
| in_out_vrr->fixed_refresh_in_uhz = in_config->fixed_refresh_in_uhz; |
| else |
| in_out_vrr->fixed_refresh_in_uhz = 0; |
| |
| refresh_range = div_u64(in_out_vrr->max_refresh_in_uhz + 500000, 1000000) - |
| + div_u64(in_out_vrr->min_refresh_in_uhz + 500000, 1000000); |
| |
| in_out_vrr->supported = true; |
| } |
| |
| in_out_vrr->fixed.ramping_active = in_config->ramping; |
| |
| in_out_vrr->btr.btr_enabled = in_config->btr; |
| |
| if (in_out_vrr->max_refresh_in_uhz < (2 * in_out_vrr->min_refresh_in_uhz)) |
| in_out_vrr->btr.btr_enabled = false; |
| else { |
| in_out_vrr->btr.margin_in_us = in_out_vrr->max_duration_in_us - |
| 2 * in_out_vrr->min_duration_in_us; |
| if (in_out_vrr->btr.margin_in_us > BTR_MAX_MARGIN) |
| in_out_vrr->btr.margin_in_us = BTR_MAX_MARGIN; |
| } |
| |
| in_out_vrr->btr.btr_active = false; |
| in_out_vrr->btr.inserted_duration_in_us = 0; |
| in_out_vrr->btr.frames_to_insert = 0; |
| in_out_vrr->btr.frame_counter = 0; |
| in_out_vrr->fixed.fixed_active = false; |
| in_out_vrr->fixed.target_refresh_in_uhz = 0; |
| |
| in_out_vrr->btr.mid_point_in_us = |
| (in_out_vrr->min_duration_in_us + |
| in_out_vrr->max_duration_in_us) / 2; |
| |
| if (in_out_vrr->state == VRR_STATE_UNSUPPORTED) { |
| in_out_vrr->adjust.v_total_min = stream->timing.v_total; |
| in_out_vrr->adjust.v_total_max = stream->timing.v_total; |
| } else if (in_out_vrr->state == VRR_STATE_DISABLED) { |
| in_out_vrr->adjust.v_total_min = stream->timing.v_total; |
| in_out_vrr->adjust.v_total_max = stream->timing.v_total; |
| } else if (in_out_vrr->state == VRR_STATE_INACTIVE) { |
| in_out_vrr->adjust.v_total_min = stream->timing.v_total; |
| in_out_vrr->adjust.v_total_max = stream->timing.v_total; |
| } else if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE && |
| refresh_range >= MIN_REFRESH_RANGE) { |
| |
| in_out_vrr->adjust.v_total_min = |
| calc_v_total_from_refresh(stream, |
| in_out_vrr->max_refresh_in_uhz); |
| in_out_vrr->adjust.v_total_max = |
| calc_v_total_from_refresh(stream, |
| in_out_vrr->min_refresh_in_uhz); |
| } else if (in_out_vrr->state == VRR_STATE_ACTIVE_FIXED) { |
| in_out_vrr->fixed.target_refresh_in_uhz = |
| in_out_vrr->fixed_refresh_in_uhz; |
| if (in_out_vrr->fixed.ramping_active && |
| in_out_vrr->fixed.fixed_active) { |
| /* Do not update vtotals if ramping is already active |
| * in order to continue ramp from current refresh. |
| */ |
| in_out_vrr->fixed.fixed_active = true; |
| } else { |
| in_out_vrr->fixed.fixed_active = true; |
| in_out_vrr->adjust.v_total_min = |
| calc_v_total_from_refresh(stream, |
| in_out_vrr->fixed.target_refresh_in_uhz); |
| in_out_vrr->adjust.v_total_max = |
| in_out_vrr->adjust.v_total_min; |
| } |
| } else { |
| in_out_vrr->state = VRR_STATE_INACTIVE; |
| in_out_vrr->adjust.v_total_min = stream->timing.v_total; |
| in_out_vrr->adjust.v_total_max = stream->timing.v_total; |
| } |
| } |
| |
| void mod_freesync_handle_preflip(struct mod_freesync *mod_freesync, |
| const struct dc_plane_state *plane, |
| const struct dc_stream_state *stream, |
| unsigned int curr_time_stamp_in_us, |
| struct mod_vrr_params *in_out_vrr) |
| { |
| struct core_freesync *core_freesync = NULL; |
| unsigned int last_render_time_in_us = 0; |
| unsigned int average_render_time_in_us = 0; |
| |
| if (mod_freesync == NULL) |
| return; |
| |
| core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync); |
| |
| if (in_out_vrr->supported && |
| in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE) { |
| unsigned int i = 0; |
| unsigned int oldest_index = plane->time.index + 1; |
| |
| if (oldest_index >= DC_PLANE_UPDATE_TIMES_MAX) |
| oldest_index = 0; |
| |
| last_render_time_in_us = curr_time_stamp_in_us - |
| plane->time.prev_update_time_in_us; |
| |
| // Sum off all entries except oldest one |
| for (i = 0; i < DC_PLANE_UPDATE_TIMES_MAX; i++) { |
| average_render_time_in_us += |
| plane->time.time_elapsed_in_us[i]; |
| } |
| average_render_time_in_us -= |
| plane->time.time_elapsed_in_us[oldest_index]; |
| |
| // Add render time for current flip |
| average_render_time_in_us += last_render_time_in_us; |
| average_render_time_in_us /= DC_PLANE_UPDATE_TIMES_MAX; |
| |
| if (in_out_vrr->btr.btr_enabled) { |
| apply_below_the_range(core_freesync, |
| stream, |
| last_render_time_in_us, |
| in_out_vrr); |
| } else { |
| apply_fixed_refresh(core_freesync, |
| stream, |
| last_render_time_in_us, |
| in_out_vrr); |
| } |
| |
| } |
| } |
| |
| void mod_freesync_handle_v_update(struct mod_freesync *mod_freesync, |
| const struct dc_stream_state *stream, |
| struct mod_vrr_params *in_out_vrr) |
| { |
| struct core_freesync *core_freesync = NULL; |
| |
| if ((mod_freesync == NULL) || (stream == NULL) || (in_out_vrr == NULL)) |
| return; |
| |
| core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync); |
| |
| if (in_out_vrr->supported == false) |
| return; |
| |
| /* Below the Range Logic */ |
| |
| /* Only execute if in fullscreen mode */ |
| if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE && |
| in_out_vrr->btr.btr_active) { |
| /* TODO: pass in flag for Pre-DCE12 ASIC |
| * in order for frame variable duration to take affect, |
| * it needs to be done one VSYNC early, which is at |
| * frameCounter == 1. |
| * For DCE12 and newer updates to V_TOTAL_MIN/MAX |
| * will take affect on current frame |
| */ |
| if (in_out_vrr->btr.frames_to_insert == |
| in_out_vrr->btr.frame_counter) { |
| in_out_vrr->adjust.v_total_min = |
| calc_v_total_from_duration(stream, |
| in_out_vrr, |
| in_out_vrr->btr.inserted_duration_in_us); |
| in_out_vrr->adjust.v_total_max = |
| in_out_vrr->adjust.v_total_min; |
| } |
| |
| if (in_out_vrr->btr.frame_counter > 0) |
| in_out_vrr->btr.frame_counter--; |
| |
| /* Restore FreeSync */ |
| if (in_out_vrr->btr.frame_counter == 0) { |
| in_out_vrr->adjust.v_total_min = |
| calc_v_total_from_refresh(stream, |
| in_out_vrr->max_refresh_in_uhz); |
| in_out_vrr->adjust.v_total_max = |
| calc_v_total_from_refresh(stream, |
| in_out_vrr->min_refresh_in_uhz); |
| } |
| } |
| |
| /* If in fullscreen freesync mode or in video, do not program |
| * static screen ramp values |
| */ |
| if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE) |
| in_out_vrr->fixed.ramping_active = false; |
| |
| /* Gradual Static Screen Ramping Logic */ |
| /* Execute if ramp is active and user enabled freesync static screen*/ |
| if (in_out_vrr->state == VRR_STATE_ACTIVE_FIXED && |
| in_out_vrr->fixed.ramping_active) { |
| update_v_total_for_static_ramp( |
| core_freesync, stream, in_out_vrr); |
| } |
| } |
| |
| void mod_freesync_get_settings(struct mod_freesync *mod_freesync, |
| const struct mod_vrr_params *vrr, |
| unsigned int *v_total_min, unsigned int *v_total_max, |
| unsigned int *event_triggers, |
| unsigned int *window_min, unsigned int *window_max, |
| unsigned int *lfc_mid_point_in_us, |
| unsigned int *inserted_frames, |
| unsigned int *inserted_duration_in_us) |
| { |
| if (mod_freesync == NULL) |
| return; |
| |
| if (vrr->supported) { |
| *v_total_min = vrr->adjust.v_total_min; |
| *v_total_max = vrr->adjust.v_total_max; |
| *event_triggers = 0; |
| *lfc_mid_point_in_us = vrr->btr.mid_point_in_us; |
| *inserted_frames = vrr->btr.frames_to_insert; |
| *inserted_duration_in_us = vrr->btr.inserted_duration_in_us; |
| } |
| } |
| |
| unsigned long long mod_freesync_calc_nominal_field_rate( |
| const struct dc_stream_state *stream) |
| { |
| unsigned long long nominal_field_rate_in_uhz = 0; |
| unsigned int total = stream->timing.h_total * stream->timing.v_total; |
| |
| /* Calculate nominal field rate for stream, rounded up to nearest integer */ |
| nominal_field_rate_in_uhz = stream->timing.pix_clk_100hz; |
| nominal_field_rate_in_uhz *= 100000000ULL; |
| |
| nominal_field_rate_in_uhz = div_u64(nominal_field_rate_in_uhz, total); |
| |
| return nominal_field_rate_in_uhz; |
| } |
| |
| bool mod_freesync_is_valid_range(uint32_t min_refresh_cap_in_uhz, |
| uint32_t max_refresh_cap_in_uhz, |
| uint32_t nominal_field_rate_in_uhz) |
| { |
| |
| /* Typically nominal refresh calculated can have some fractional part. |
| * Allow for some rounding error of actual video timing by taking floor |
| * of caps and request. Round the nominal refresh rate. |
| * |
| * Dividing will convert everything to units in Hz although input |
| * variable name is in uHz! |
| * |
| * Also note, this takes care of rounding error on the nominal refresh |
| * so by rounding error we only expect it to be off by a small amount, |
| * such as < 0.1 Hz. i.e. 143.9xxx or 144.1xxx. |
| * |
| * Example 1. Caps Min = 40 Hz, Max = 144 Hz |
| * Request Min = 40 Hz, Max = 144 Hz |
| * Nominal = 143.5x Hz rounded to 144 Hz |
| * This function should allow this as valid request |
| * |
| * Example 2. Caps Min = 40 Hz, Max = 144 Hz |
| * Request Min = 40 Hz, Max = 144 Hz |
| * Nominal = 144.4x Hz rounded to 144 Hz |
| * This function should allow this as valid request |
| * |
| * Example 3. Caps Min = 40 Hz, Max = 144 Hz |
| * Request Min = 40 Hz, Max = 144 Hz |
| * Nominal = 120.xx Hz rounded to 120 Hz |
| * This function should return NOT valid since the requested |
| * max is greater than current timing's nominal |
| * |
| * Example 4. Caps Min = 40 Hz, Max = 120 Hz |
| * Request Min = 40 Hz, Max = 120 Hz |
| * Nominal = 144.xx Hz rounded to 144 Hz |
| * This function should return NOT valid since the nominal |
| * is greater than the capability's max refresh |
| */ |
| nominal_field_rate_in_uhz = |
| div_u64(nominal_field_rate_in_uhz + 500000, 1000000); |
| min_refresh_cap_in_uhz /= 1000000; |
| max_refresh_cap_in_uhz /= 1000000; |
| |
| // Check nominal is within range |
| if (nominal_field_rate_in_uhz > max_refresh_cap_in_uhz || |
| nominal_field_rate_in_uhz < min_refresh_cap_in_uhz) |
| return false; |
| |
| // If nominal is less than max, limit the max allowed refresh rate |
| if (nominal_field_rate_in_uhz < max_refresh_cap_in_uhz) |
| max_refresh_cap_in_uhz = nominal_field_rate_in_uhz; |
| |
| // Check min is within range |
| if (min_refresh_cap_in_uhz > max_refresh_cap_in_uhz) |
| return false; |
| |
| // For variable range, check for at least 10 Hz range |
| if (nominal_field_rate_in_uhz - min_refresh_cap_in_uhz < 10) |
| return false; |
| |
| return true; |
| } |
| |
