]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/commitdiff
drm/amd/display: Skip modeset for front porch change
authorAurabindo Pillai <aurabindo.pillai@amd.com>
Thu, 10 Dec 2020 18:48:23 +0000 (13:48 -0500)
committerAlex Deucher <alexander.deucher@amd.com>
Fri, 26 Feb 2021 22:23:49 +0000 (17:23 -0500)
[Why]
A seamless transition between modes can be performed if the new incoming
mode has the same timing parameters as the optimized mode on a display with a
variable vtotal min/max.

Smooth video playback usecases can be enabled with this seamless transition by
switching to a new mode which has a refresh rate matching the video.

[How]
Skip full modeset if userspace requested a compatible freesync mode which only
differs in the front porch timing from the current mode.

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

index 872433bbfc2f78e0a01737105bb446ac130ea672..133da6f7aabed34be01415029a05804417267a89 100644 (file)
@@ -213,6 +213,9 @@ static bool amdgpu_dm_psr_disable_all(struct amdgpu_display_manager *dm);
 static const struct drm_format_info *
 amd_get_format_info(const struct drm_mode_fb_cmd2 *cmd);
 
+static bool
+is_timing_unchanged_for_freesync(struct drm_crtc_state *old_crtc_state,
+                                struct drm_crtc_state *new_crtc_state);
 /*
  * dm_vblank_get_counter
  *
@@ -336,6 +339,17 @@ static inline bool amdgpu_dm_vrr_active(struct dm_crtc_state *dm_state)
               dm_state->freesync_config.state == VRR_STATE_ACTIVE_FIXED;
 }
 
+static inline bool is_dc_timing_adjust_needed(struct dm_crtc_state *old_state,
+                                             struct dm_crtc_state *new_state)
+{
+       if (new_state->freesync_config.state ==  VRR_STATE_ACTIVE_FIXED)
+               return true;
+       else if (amdgpu_dm_vrr_active(old_state) != amdgpu_dm_vrr_active(new_state))
+               return true;
+       else
+               return false;
+}
+
 /**
  * dm_pflip_high_irq() - Handle pageflip interrupt
  * @interrupt_params: ignored
@@ -4993,19 +5007,16 @@ static void fill_stream_properties_from_drm_display_mode(
                timing_out->hdmi_vic = hv_frame.vic;
        }
 
-       timing_out->h_addressable = mode_in->crtc_hdisplay;
-       timing_out->h_total = mode_in->crtc_htotal;
-       timing_out->h_sync_width =
-               mode_in->crtc_hsync_end - mode_in->crtc_hsync_start;
-       timing_out->h_front_porch =
-               mode_in->crtc_hsync_start - mode_in->crtc_hdisplay;
-       timing_out->v_total = mode_in->crtc_vtotal;
-       timing_out->v_addressable = mode_in->crtc_vdisplay;
-       timing_out->v_front_porch =
-               mode_in->crtc_vsync_start - mode_in->crtc_vdisplay;
-       timing_out->v_sync_width =
-               mode_in->crtc_vsync_end - mode_in->crtc_vsync_start;
-       timing_out->pix_clk_100hz = mode_in->crtc_clock * 10;
+       timing_out->h_addressable = mode_in->hdisplay;
+       timing_out->h_total = mode_in->htotal;
+       timing_out->h_sync_width = mode_in->hsync_end - mode_in->hsync_start;
+       timing_out->h_front_porch = mode_in->hsync_start - mode_in->hdisplay;
+       timing_out->v_total = mode_in->vtotal;
+       timing_out->v_addressable = mode_in->vdisplay;
+       timing_out->v_front_porch = mode_in->vsync_start - mode_in->vdisplay;
+       timing_out->v_sync_width = mode_in->vsync_end - mode_in->vsync_start;
+       timing_out->pix_clk_100hz = mode_in->clock * 10;
+
        timing_out->aspect_ratio = get_aspect_ratio(mode_in);
 
        stream->output_color_space = get_output_color_space(timing_out);
@@ -5225,6 +5236,33 @@ get_highest_refresh_rate_mode(struct amdgpu_dm_connector *aconnector,
        return m_pref;
 }
 
+static bool is_freesync_video_mode(struct drm_display_mode *mode,
+                                  struct amdgpu_dm_connector *aconnector)
+{
+       struct drm_display_mode *high_mode;
+       int timing_diff;
+
+       high_mode = get_highest_refresh_rate_mode(aconnector, false);
+       if (!high_mode || !mode)
+               return false;
+
+       timing_diff = high_mode->vtotal - mode->vtotal;
+
+       if (high_mode->clock == 0 || high_mode->clock != mode->clock ||
+           high_mode->hdisplay != mode->hdisplay ||
+           high_mode->vdisplay != mode->vdisplay ||
+           high_mode->hsync_start != mode->hsync_start ||
+           high_mode->hsync_end != mode->hsync_end ||
+           high_mode->htotal != mode->htotal ||
+           high_mode->hskew != mode->hskew ||
+           high_mode->vscan != mode->vscan ||
+           high_mode->vsync_start - mode->vsync_start != timing_diff ||
+           high_mode->vsync_end - mode->vsync_end != timing_diff)
+               return false;
+       else
+               return true;
+}
+
 static struct dc_stream_state *
 create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
                       const struct drm_display_mode *drm_mode,
@@ -5238,8 +5276,10 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
                dm_state ? &dm_state->base : NULL;
        struct dc_stream_state *stream = NULL;
        struct drm_display_mode mode = *drm_mode;
+       struct drm_display_mode saved_mode;
+       struct drm_display_mode *freesync_mode = NULL;
        bool native_mode_found = false;
-       bool scale = dm_state ? (dm_state->scaling != RMX_OFF) : false;
+       bool recalculate_timing = dm_state ? (dm_state->scaling != RMX_OFF) : false;
        int mode_refresh;
        int preferred_refresh = 0;
 #if defined(CONFIG_DRM_AMD_DC_DCN)
@@ -5247,6 +5287,9 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
        uint32_t link_bandwidth_kbps;
 #endif
        struct dc_sink *sink = NULL;
+
+       memset(&saved_mode, 0, sizeof(saved_mode));
+
        if (aconnector == NULL) {
                DRM_ERROR("aconnector is NULL!\n");
                return stream;
@@ -5299,25 +5342,38 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
                 */
                DRM_DEBUG_DRIVER("No preferred mode found\n");
        } else {
-               decide_crtc_timing_for_drm_display_mode(
+               recalculate_timing |= amdgpu_freesync_vid_mode &&
+                                is_freesync_video_mode(&mode, aconnector);
+               if (recalculate_timing) {
+                       freesync_mode = get_highest_refresh_rate_mode(aconnector, false);
+                       saved_mode = mode;
+                       mode = *freesync_mode;
+               } else {
+                       decide_crtc_timing_for_drm_display_mode(
                                &mode, preferred_mode,
                                dm_state ? (dm_state->scaling != RMX_OFF) : false);
+               }
+
                preferred_refresh = drm_mode_vrefresh(preferred_mode);
        }
 
-       if (!dm_state)
+       if (recalculate_timing)
+               drm_mode_set_crtcinfo(&saved_mode, 0);
+       else
                drm_mode_set_crtcinfo(&mode, 0);
 
-       /*
+       /*
        * If scaling is enabled and refresh rate didn't change
        * we copy the vic and polarities of the old timings
        */
-       if (!scale || mode_refresh != preferred_refresh)
-               fill_stream_properties_from_drm_display_mode(stream,
-                       &mode, &aconnector->base, con_state, NULL, requested_bpc);
+       if (!recalculate_timing || mode_refresh != preferred_refresh)
+               fill_stream_properties_from_drm_display_mode(
+                       stream, &mode, &aconnector->base, con_state, NULL,
+                       requested_bpc);
        else
-               fill_stream_properties_from_drm_display_mode(stream,
-                       &mode, &aconnector->base, con_state, old_stream, requested_bpc);
+               fill_stream_properties_from_drm_display_mode(
+                       stream, &mode, &aconnector->base, con_state, old_stream,
+                       requested_bpc);
 
        stream->timing.flags.DSC = 0;
 
@@ -7802,9 +7858,22 @@ static void update_stream_irq_parameters(
        if (new_crtc_state->vrr_supported &&
            config.min_refresh_in_uhz &&
            config.max_refresh_in_uhz) {
-               config.state = new_crtc_state->base.vrr_enabled ?
-                       VRR_STATE_ACTIVE_VARIABLE :
-                       VRR_STATE_INACTIVE;
+               /*
+                * if freesync compatible mode was set, config.state will be set
+                * in atomic check
+                */
+               if (config.state == VRR_STATE_ACTIVE_FIXED && config.fixed_refresh_in_uhz &&
+                   (!drm_atomic_crtc_needs_modeset(&new_crtc_state->base) ||
+                    new_crtc_state->freesync_config.state == VRR_STATE_ACTIVE_FIXED)) {
+                       vrr_params.max_refresh_in_uhz = config.max_refresh_in_uhz;
+                       vrr_params.min_refresh_in_uhz = config.min_refresh_in_uhz;
+                       vrr_params.fixed_refresh_in_uhz = config.fixed_refresh_in_uhz;
+                       vrr_params.state = VRR_STATE_ACTIVE_FIXED;
+               } else {
+                       config.state = new_crtc_state->base.vrr_enabled ?
+                                                    VRR_STATE_ACTIVE_VARIABLE :
+                                                    VRR_STATE_INACTIVE;
+               }
        } else {
                config.state = VRR_STATE_UNSUPPORTED;
        }
@@ -8125,8 +8194,7 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
                 * re-adjust the min/max bounds now that DC doesn't handle this
                 * as part of commit.
                 */
-               if (amdgpu_dm_vrr_active(dm_old_crtc_state) !=
-                   amdgpu_dm_vrr_active(acrtc_state)) {
+               if (is_dc_timing_adjust_needed(dm_old_crtc_state, acrtc_state)) {
                        spin_lock_irqsave(&pcrtc->dev->event_lock, flags);
                        dc_stream_adjust_vmin_vmax(
                                dm->dc, acrtc_state->stream,
@@ -8411,6 +8479,7 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
                        /* i.e. reset mode */
                        if (dm_old_crtc_state->stream)
                                remove_stream(adev, acrtc, dm_old_crtc_state->stream);
+
                        mode_set_reset_required = true;
                }
        } /* for_each_crtc_in_state() */
@@ -8809,6 +8878,7 @@ static void get_freesync_config_for_crtc(
                        to_amdgpu_dm_connector(new_con_state->base.connector);
        struct drm_display_mode *mode = &new_crtc_state->base.mode;
        int vrefresh = drm_mode_vrefresh(mode);
+       bool fs_vid_mode = false;
 
        new_crtc_state->vrr_supported = new_con_state->freesync_capable &&
                                        vrefresh >= aconnector->min_vfreq &&
@@ -8816,17 +8886,24 @@ static void get_freesync_config_for_crtc(
 
        if (new_crtc_state->vrr_supported) {
                new_crtc_state->stream->ignore_msa_timing_param = true;
-               config.state = new_crtc_state->base.vrr_enabled ?
-                               VRR_STATE_ACTIVE_VARIABLE :
-                               VRR_STATE_INACTIVE;
-               config.min_refresh_in_uhz =
-                               aconnector->min_vfreq * 1000000;
-               config.max_refresh_in_uhz =
-                               aconnector->max_vfreq * 1000000;
+               fs_vid_mode = new_crtc_state->freesync_config.state == VRR_STATE_ACTIVE_FIXED;
+
+               config.min_refresh_in_uhz = aconnector->min_vfreq * 1000000;
+               config.max_refresh_in_uhz = aconnector->max_vfreq * 1000000;
                config.vsif_supported = true;
                config.btr = true;
-       }
 
+               if (fs_vid_mode) {
+                       config.state = VRR_STATE_ACTIVE_FIXED;
+                       config.fixed_refresh_in_uhz = new_crtc_state->freesync_config.fixed_refresh_in_uhz;
+                       goto out;
+               } else if (new_crtc_state->base.vrr_enabled) {
+                       config.state = VRR_STATE_ACTIVE_VARIABLE;
+               } else {
+                       config.state = VRR_STATE_INACTIVE;
+               }
+       }
+out:
        new_crtc_state->freesync_config = config;
 }
 
@@ -8839,6 +8916,50 @@ static void reset_freesync_config_for_crtc(
               sizeof(new_crtc_state->vrr_infopacket));
 }
 
+static bool
+is_timing_unchanged_for_freesync(struct drm_crtc_state *old_crtc_state,
+                                struct drm_crtc_state *new_crtc_state)
+{
+       struct drm_display_mode old_mode, new_mode;
+
+       if (!old_crtc_state || !new_crtc_state)
+               return false;
+
+       old_mode = old_crtc_state->mode;
+       new_mode = new_crtc_state->mode;
+
+       if (old_mode.clock       == new_mode.clock &&
+           old_mode.hdisplay    == new_mode.hdisplay &&
+           old_mode.vdisplay    == new_mode.vdisplay &&
+           old_mode.htotal      == new_mode.htotal &&
+           old_mode.vtotal      != new_mode.vtotal &&
+           old_mode.hsync_start == new_mode.hsync_start &&
+           old_mode.vsync_start != new_mode.vsync_start &&
+           old_mode.hsync_end   == new_mode.hsync_end &&
+           old_mode.vsync_end   != new_mode.vsync_end &&
+           old_mode.hskew       == new_mode.hskew &&
+           old_mode.vscan       == new_mode.vscan &&
+           (old_mode.vsync_end - old_mode.vsync_start) ==
+           (new_mode.vsync_end - new_mode.vsync_start))
+               return true;
+
+       return false;
+}
+
+static void set_freesync_fixed_config(struct dm_crtc_state *dm_new_crtc_state) {
+       uint64_t num, den, res;
+       struct drm_crtc_state *new_crtc_state = &dm_new_crtc_state->base;
+
+       dm_new_crtc_state->freesync_config.state = VRR_STATE_ACTIVE_FIXED;
+
+       num = (unsigned long long)new_crtc_state->mode.clock * 1000 * 1000000;
+       den = (unsigned long long)new_crtc_state->mode.htotal *
+             (unsigned long long)new_crtc_state->mode.vtotal;
+
+       res = div_u64(num, den);
+       dm_new_crtc_state->freesync_config.fixed_refresh_in_uhz = res;
+}
+
 static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
                                struct drm_atomic_state *state,
                                struct drm_crtc *crtc,
@@ -8929,6 +9050,11 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
                 * TODO: Refactor this function to allow this check to work
                 * in all conditions.
                 */
+               if (amdgpu_freesync_vid_mode &&
+                   dm_new_crtc_state->stream &&
+                   is_timing_unchanged_for_freesync(new_crtc_state, old_crtc_state))
+                       goto skip_modeset;
+
                if (dm_new_crtc_state->stream &&
                    dc_is_stream_unchanged(new_stream, dm_old_crtc_state->stream) &&
                    dc_is_stream_scaling_unchanged(new_stream, dm_old_crtc_state->stream)) {
@@ -8960,6 +9086,24 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
                if (!dm_old_crtc_state->stream)
                        goto skip_modeset;
 
+               if (amdgpu_freesync_vid_mode && dm_new_crtc_state->stream &&
+                   is_timing_unchanged_for_freesync(new_crtc_state,
+                                                    old_crtc_state)) {
+                       new_crtc_state->mode_changed = false;
+                       DRM_DEBUG_DRIVER(
+                               "Mode change not required for front porch change, "
+                               "setting mode_changed to %d",
+                               new_crtc_state->mode_changed);
+
+                       set_freesync_fixed_config(dm_new_crtc_state);
+
+                       goto skip_modeset;
+               } else if (amdgpu_freesync_vid_mode && aconnector &&
+                          is_freesync_video_mode(&new_crtc_state->mode,
+                                                 aconnector)) {
+                       set_freesync_fixed_config(dm_new_crtc_state);
+               }
+
                ret = dm_atomic_get_state(state, &dm_state);
                if (ret)
                        goto fail;