[PATCH 3/3] drm/amd/display: Skip modeset for front porch change
Aurabindo Pillai
aurabindo.pillai at amd.com
Mon Jan 4 20:43:12 UTC 2021
On Mon, 2021-01-04 at 11:16 -0500, Kazlauskas, Nicholas wrote:
> On 2020-12-09 9:45 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>
> > ---
> > .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 169
> > ++++++++++++++++--
> > .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 1 +
> > 2 files changed, 153 insertions(+), 17 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 f699a3d41cad..c8c72887906a 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > @@ -217,6 +217,9 @@ 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
> > *
> > @@ -5096,8 +5099,11 @@ copy_crtc_timing_for_drm_display_mode(const
> > struct drm_display_mode *src_mode,
> > static void
> > decide_crtc_timing_for_drm_display_mode(struct drm_display_mode
> > *drm_mode,
> > const struct
> > drm_display_mode *native_mode,
> > - bool scale_enabled)
> > + bool scale_enabled, bool
> > fs_mode)
> > {
> > + if (fs_mode)
> > + return;
> > +
> > if (scale_enabled) {
> > copy_crtc_timing_for_drm_display_mode(native_mode,
> > drm_mode);
> > } else if (native_mode->clock == drm_mode->clock &&
> > @@ -5241,6 +5247,24 @@ get_highest_freesync_mode(struct
> > amdgpu_dm_connector *aconnector,
> > return m_high;
> > }
> >
> > +static bool is_freesync_video_mode(struct drm_display_mode *mode,
> > + struct amdgpu_dm_connector
> > *aconnector)
> > +{
> > + struct drm_display_mode *high_mode;
> > +
> > + high_mode = get_highest_freesync_mode(aconnector, false);
> > + if (!high_mode)
> > + return false;
> > +
> > + if (high_mode->clock == 0 ||
> > + high_mode->hdisplay != mode->hdisplay ||
> > + high_mode->clock != mode->clock ||
> > + !mode)
> > + return false;
> > + else
> > + return true;
> > +}
> > +
>
> Need to check that the other parameters are the same:
> - hsync_start
> - hsync_end
> - htotal
> - hskew
> - vdisplay
> - vscan
>
> etc.
Will do.
>
> > static struct dc_stream_state *
> > create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
> > const struct drm_display_mode *drm_mode,
> > @@ -5253,17 +5277,21 @@ create_stream_for_sink(struct
> > amdgpu_dm_connector *aconnector,
> > const struct drm_connector_state *con_state =
> > 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, mode = *drm_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;
> > #if defined(CONFIG_DRM_AMD_DC_DCN)
> > struct dsc_dec_dpcd_caps dsc_caps;
> > #endif
> > uint32_t link_bandwidth_kbps;
> > -
> > struct dc_sink *sink = NULL;
> > +
> > + memset(&saved_mode, 0, sizeof(struct drm_display_mode));
> > +
> > if (aconnector == NULL) {
> > DRM_ERROR("aconnector is NULL!\n");
> > return stream;
> > @@ -5316,20 +5344,33 @@ create_stream_for_sink(struct
> > amdgpu_dm_connector *aconnector,
> > */
> > DRM_DEBUG_DRIVER("No preferred mode found\n");
> > } else {
> > + is_fs_vid_mode = is_freesync_video_mode(&mode,
> > aconnector);
> > + if (is_fs_vid_mode) {
> > + freesync_mode =
> > get_highest_freesync_mode(aconnector, false);
> > + if (freesync_mode) {
> > + saved_mode = mode;
> > + mode = *freesync_mode;
> > + }
> > + }
> > +
> > decide_crtc_timing_for_drm_display_mode(
> > &mode, preferred_mode,
> > - dm_state ? (dm_state->scaling !=
> > RMX_OFF) : false);
> > + dm_state ? (dm_state->scaling !=
> > RMX_OFF) : false,
> > + freesync_mode ? true : false);
>
> I don't think we need an additional flag here - scaling/freesync
> behave
> the same, maybe just rename the variable in the function.
This was fixed in v3. Will send out a v4 with above change and the
suggestion from Alex to change the module parameter name.
>
> Regards,
> Nicholas Kazlauskas
>
> > preferred_refresh =
> > drm_mode_vrefresh(preferred_mode);
> > }
> >
> > if (!dm_state)
> > drm_mode_set_crtcinfo(&mode, 0);
> >
> > - /*
> > + if (dm_state && is_fs_vid_mode && freesync_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)
> > + if (!(scale && freesync_mode) || mode_refresh !=
> > preferred_refresh)
> > fill_stream_properties_from_drm_display_mode(stream
> > ,
> > &mode, &aconnector->base, con_state, NULL,
> > requested_bpc);
> > else
> > @@ -7881,13 +7922,29 @@ 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;
> > + }
> > +
> > config.state = new_crtc_state->base.vrr_enabled ?
> > VRR_STATE_ACTIVE_VARIABLE :
> > VRR_STATE_INACTIVE;
> > - } else {
> > + } else
> > config.state = VRR_STATE_UNSUPPORTED;
> > - }
> >
> > +out:
> > mod_freesync_build_vrr_params(dm->freesync_module,
> > new_stream,
> > &config, &vrr_params);
> > @@ -8205,7 +8262,9 @@ 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 ||
> > + acrtc_state->freesync_video_mode) {
> > spin_lock_irqsave(&pcrtc->dev->event_lock,
> > flags);
> > dc_stream_adjust_vmin_vmax(
> > dm->dc, acrtc_state->stream,
> > @@ -8896,6 +8955,7 @@ 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 &&
> > @@ -8903,17 +8963,26 @@ 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;
> > +
> > + }
> > +out:
> > new_crtc_state->freesync_config = config;
> > }
> >
> > @@ -8926,6 +8995,51 @@ 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;
> > +}
> > +
> > static int dm_update_crtc_state(struct amdgpu_display_manager
> > *dm,
> > struct drm_atomic_state *state,
> > struct drm_crtc *crtc,
> > @@ -9016,6 +9130,11 @@ 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)
> > + 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)) {
> > @@ -9047,6 +9166,22 @@ 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) {
> > + 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))
> > + 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 251af783f6b1..28f2d8c9b260 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> > @@ -453,6 +453,7 @@ struct dm_crtc_state {
> >
> > bool freesync_timing_changed;
> > bool freesync_vrr_info_changed;
> > + bool freesync_video_mode;
> >
> > bool dsc_force_changed;
> > bool vrr_supported;
> >
>
More information about the amd-gfx
mailing list