[PATCH v3 3/3] drm/amd/display: Skip modeset for front porch change
Kazlauskas, Nicholas
nicholas.kazlauskas at amd.com
Wed Jan 6 20:02:59 UTC 2021
On 2021-01-04 4:08 p.m., Aurabindo Pillai wrote:
> [Why&How]
> Inorder to enable freesync video mode, driver adds extra
> modes based on preferred modes for common freesync frame rates.
> When commiting these mode changes, a full modeset is not needed.
> If the change in only in the front porch timing value, skip full
> modeset and continue using the same stream.
>
> Signed-off-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
> Acked-by: Christian König <christian.koenig at amd.com>
> ---
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 219 +++++++++++++++---
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 1 +
> 2 files changed, 188 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index aaef2fb528fd..315756207f0f 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -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
> *
> @@ -4940,7 +4943,8 @@ static void fill_stream_properties_from_drm_display_mode(
> const struct drm_connector *connector,
> const struct drm_connector_state *connector_state,
> const struct dc_stream_state *old_stream,
> - int requested_bpc)
> + int requested_bpc,
> + bool is_in_modeset)
> {
> struct dc_crtc_timing *timing_out = &stream->timing;
> const struct drm_display_info *info = &connector->display_info;
> @@ -4995,19 +4999,28 @@ 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;
> + if (is_in_modeset) {
> + 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;
> + } else {
> + 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->aspect_ratio = get_aspect_ratio(mode_in);
>
> stream->output_color_space = get_output_color_space(timing_out);
> @@ -5227,6 +5240,33 @@ 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,
> @@ -5240,15 +5280,21 @@ 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;
> int mode_refresh;
> int preferred_refresh = 0;
> + bool is_fs_vid_mode = 0;
nitpick: change 0 to false
> #if defined(CONFIG_DRM_AMD_DC_DCN)
> struct dsc_dec_dpcd_caps dsc_caps;
> uint32_t link_bandwidth_kbps;
> #endif
> struct dc_sink *sink = NULL;
> +
> + memset(&saved_mode, 0, sizeof(struct drm_display_mode));
nitpick: sizeof(saved_mode)
> +
> if (aconnector == NULL) {
> DRM_ERROR("aconnector is NULL!\n");
> return stream;
> @@ -5301,25 +5347,39 @@ 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(
> + is_fs_vid_mode = is_freesync_video_mode(&mode, aconnector);
> + if (is_fs_vid_mode) {
> + freesync_mode = get_highest_refresh_rate_mode(aconnector, false);
> + saved_mode = mode;
> + mode = *freesync_mode;
> + }
> +
> + if (!is_fs_vid_mode)
nitpick: don't need to check this twice, just use an } 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)
> drm_mode_set_crtcinfo(&mode, 0);
>
> - /*
> + if (dm_state && is_fs_vid_mode)
> + drm_mode_set_crtcinfo(&saved_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 (!(scale && is_fs_vid_mode) || mode_refresh != preferred_refresh)
> + fill_stream_properties_from_drm_display_mode(
> + stream, &mode, &aconnector->base, con_state, NULL,
> + requested_bpc, dm_state ? 1 : 0);
Some notes on this dm_state 1 : 0 stuff below...
> 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, dm_state ? 1 : 0);
>
> stream->timing.flags.DSC = 0;
>
> @@ -7847,13 +7907,29 @@ static void update_stream_irq_parameters(
> if (new_crtc_state->vrr_supported &&
> config.min_refresh_in_uhz &&
> config.max_refresh_in_uhz) {
> + /*
> + * 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 && config.max_refresh_in_uhz &&
> + config.min_refresh_in_uhz &&
> + (!drm_atomic_crtc_needs_modeset(&new_crtc_state->base) ||
> + new_crtc_state->freesync_video_mode)) {
> + 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;
> + goto out;
style nitpick: can just drop this goto if you do an } else { here.
> + }
> +
> config.state = new_crtc_state->base.vrr_enabled ?
> VRR_STATE_ACTIVE_VARIABLE :
> VRR_STATE_INACTIVE;
> - } else {
> + } else
style nitpick: prefer braces on all conditions if they're on any, ie.
use } else {
> config.state = VRR_STATE_UNSUPPORTED;
> - }
>
> +out:
> mod_freesync_build_vrr_params(dm->freesync_module,
> new_stream,
> &config, &vrr_params);
> @@ -8171,7 +8247,9 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
> * as part of commit.
> */
> if (amdgpu_dm_vrr_active(dm_old_crtc_state) !=
> - amdgpu_dm_vrr_active(acrtc_state)) {
> + amdgpu_dm_vrr_active(acrtc_state) ||
> + acrtc_state->freesync_config.state == VRR_STATE_ACTIVE_FIXED ||
You should be modifying the amdgpu_dm_vrr_active check instead. It's
important that we're sending back the correct vblank events to userspace
as long as we're in DRR.
The logic that does this is in the IRQ handlers, but you should only
need to modify this check function.
> + acrtc_state->freesync_video_mode) {
> spin_lock_irqsave(&pcrtc->dev->event_lock, flags);
> dc_stream_adjust_vmin_vmax(
> dm->dc, acrtc_state->stream,
> @@ -8867,6 +8945,7 @@ 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 &&
> @@ -8874,17 +8953,26 @@ 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 ||
> + new_crtc_state->freesync_video_mode;
> +
> + 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 && !fs_vid_mode)
> + config.state = VRR_STATE_ACTIVE_VARIABLE;
> + else
> + config.state = VRR_STATE_INACTIVE;
style nitpick: braces on all if conditions
You also don't need to check !fs_vid_mode, it's always false in this branch.
> +
> + }
> +out:
> new_crtc_state->freesync_config = config;
> }
>
> @@ -8897,6 +8985,51 @@ 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;
> + dm_new_crtc_state->freesync_video_mode = true;
The 'freesync_video_mode' doesn't automatically carry over when CRTC
state is duplicated. You'll need to add that to dm_crtc_duplicate_state
as well, but keep in mind that I don't see you resetting this to false
anywhere.
You might want to add that in on removing the stream, but I haven't
looked too deep into this.
> +}
> +
> static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
> struct drm_atomic_state *state,
> struct drm_crtc *crtc,
> @@ -8987,6 +9120,11 @@ 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 (dm_new_crtc_state->stream &&
> + is_timing_unchanged_for_freesync(new_crtc_state, old_crtc_state) &&
> + amdgpu_exp_freesync_vid_mode)
Reorder this so that we have amdgpu_exp_freesync_vid_mode as the first
check. Small optimization.
> + 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)) {
> @@ -9018,6 +9156,23 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
> if (!dm_old_crtc_state->stream)
> goto skip_modeset;
>
> + if (dm_new_crtc_state->stream &&
> + is_timing_unchanged_for_freesync(new_crtc_state, old_crtc_state) &&
> + amdgpu_exp_freesync_vid_mode) {
Reorder this so that we have amdgpu_exp_freesync_vid_mode as the first
check. Small optimization.
Regards,
Nicholas Kazlauskas
> + 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 (aconnector &&
> + is_freesync_video_mode(&new_crtc_state->mode, aconnector) &&
> + amdgpu_exp_freesync_vid_mode)
> + set_freesync_fixed_config(dm_new_crtc_state);
> +
> ret = dm_atomic_get_state(state, &dm_state);
> if (ret)
> goto fail;
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> index 3ea85be9c546..ff4675572125 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> @@ -474,6 +474,7 @@ struct dm_crtc_state {
>
> bool freesync_timing_changed;
> bool freesync_vrr_info_changed;
> + bool freesync_video_mode;
>
> bool dsc_force_changed;
> bool vrr_supported;
>
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