[PATCH v3 3/3] drm/amd/display: Skip modeset for front porch change
Aurabindo Pillai
aurabindo.pillai at amd.com
Sun Jan 17 19:52:27 UTC 2021
--
Thanks & Regards,
Aurabindo Pillai
On Wed, Jan 6, 2021 at 15:02, "Kazlauskas, Nicholas"
<nicholas.kazlauskas at amd.com> wrote:
> 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.
This is a duplicate check indeed. Will have it removed. However the
check for freesync_video_mode is still needed. Will send a v5 along
with other changes suggested above.
>
>
>> + 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.
Will fix.
>
>> +
>> + }
>> +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.
Freesync config is already copied in dm_crtc_duplicate_state, so we
only need to add freesync_video_mode duplication there. Will add
resetting freesync_video_mode as well. I'm not sure if setting this to
false during stream removal is necessary though, since other freesync
parameters appear to be untouched in dm's commit_tail. What I'm
thinking is like:
---
static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
[snip]
continue;
}
- if (dm_old_crtc_state->stream)
+ if (dm_old_crtc_state->stream) {
remove_stream(adev, acrtc,
dm_old_crtc_state->stream);
+ dm_old_crtc_state->freesync_video_mode
= 0;
+ }
pm_runtime_get_noresume(dev->dev);
---
>
>> +}
>> +
>> 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.
>
Will do these two reorders.
> 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;
>>
>
--
Thanks & Regards,
Aurabindo
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