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| author | Mikita Lipski <mikita.lipski@amd.com> | 2017-10-17 15:29:22 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2017-12-06 12:47:22 -0500 |
| commit | fa2123dbccdc881fae02aaf8b05758db53d62955 (patch) | |
| tree | cdbeaec656d934980a48b8e60a97409ea587328c /drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | |
| parent | 79c631239a83aeb3e13216f2eda1741650645d64 (diff) | |
| download | lwn-fa2123dbccdc881fae02aaf8b05758db53d62955.tar.gz lwn-fa2123dbccdc881fae02aaf8b05758db53d62955.zip | |
drm/amd/display: Multi display synchronization logic
This feature synchronizes multiple displays with various timings
to a display with the highest refresh rate
it is enabled if edid caps flag multi_display_sync is set to one
There are limitations on refresh rates allowed
that can be synchronized. That would
prevent from underflow and other potential
corruptions.
Multi display synchronization is using the
same functions as timing_sync in order to minimize
redunduncy and decision to disable synchronization is
based on trigger parametre set in DM
Feature is developed for DCN1 and DCE11
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Mikita Lipski <Mikita.Lipski@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 54 |
1 files changed, 53 insertions, 1 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 3bc314872304..8360d17125ae 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2298,6 +2298,56 @@ static int create_fake_sink(struct amdgpu_dm_connector *aconnector) return 0; } +static void set_multisync_trigger_params( + struct dc_stream_state *stream) +{ + if (stream->triggered_crtc_reset.enabled) { + stream->triggered_crtc_reset.event = CRTC_EVENT_VSYNC_RISING; + stream->triggered_crtc_reset.delay = TRIGGER_DELAY_NEXT_LINE; + } +} + +static void set_master_stream(struct dc_stream_state *stream_set[], + int stream_count) +{ + int j, highest_rfr = 0, master_stream = 0; + + for (j = 0; j < stream_count; j++) { + if (stream_set[j] && stream_set[j]->triggered_crtc_reset.enabled) { + int refresh_rate = 0; + + refresh_rate = (stream_set[j]->timing.pix_clk_khz*1000)/ + (stream_set[j]->timing.h_total*stream_set[j]->timing.v_total); + if (refresh_rate > highest_rfr) { + highest_rfr = refresh_rate; + master_stream = j; + } + } + } + for (j = 0; j < stream_count; j++) { + if (stream_set[j] && j != master_stream) + stream_set[j]->triggered_crtc_reset.event_source = stream_set[master_stream]; + } +} + +static void dm_enable_per_frame_crtc_master_sync(struct dc_state *context) +{ + int i = 0; + + if (context->stream_count < 2) + return; + for (i = 0; i < context->stream_count ; i++) { + if (!context->streams[i]) + continue; + /* TODO: add a function to read AMD VSDB bits and will set + * crtc_sync_master.multi_sync_enabled flag + * For now its set to false + */ + set_multisync_trigger_params(context->streams[i]); + } + set_master_stream(context->streams, context->stream_count); +} + static struct dc_stream_state * create_stream_for_sink(struct amdgpu_dm_connector *aconnector, const struct drm_display_mode *drm_mode, @@ -4132,8 +4182,10 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state) } } - if (dm_state->context) + if (dm_state->context) { + dm_enable_per_frame_crtc_master_sync(dm_state->context); WARN_ON(!dc_commit_state(dm->dc, dm_state->context)); + } for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) { struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc); |