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| author | Victor Lu <victorchengchi.lu@amd.com> | 2020-07-21 19:08:34 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-08-05 00:29:28 +0300 |
| commit | 3d4e52d0cf24b424c668fa8ab1269725796d4ec4 (patch) | |
| tree | 995005ae2f83fe501d44be137c1eee7f970f6ff2 /drivers/gpu/drm/amd/display/dc/dc_stream.h | |
| parent | da83b385f3eba1d695bc8014d8a5c0a791188c16 (diff) | |
| download | linux-3d4e52d0cf24b424c668fa8ab1269725796d4ec4.tar.xz | |
drm/amd/display: Add debugfs for forcing stream timing sync
[why]
There's currently no method to enable multi-stream synchronization from
userspace and we don't check the VSDB bits to know whether or not
specific displays should have the feature enable.
[how]
Add a debugfs entry that controls a new DM debug option,
"force_timing_sync". This debug option will set on any newly created
stream following the change to the debug option.
Expose a new interface from DC that performs the timing sync and a helper
to the "force_timing_sync" debugfs that iterates over the current streams
and modifies the current synchornization state and grouping.
Example usage to force a resync (from an X based desktop):
echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_force_timing_sync
xset dpms force off && xset dpms force on
Signed-off-by: Victor Lu <victorchengchi.lu@amd.com>
Reviewed-by: Aurabindo Jayamohanan Pillai <Aurabindo.Pillai@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Acked-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dc_stream.h')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_stream.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h index 633442bc7ef2..37743073772b 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_stream.h +++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h @@ -397,6 +397,8 @@ bool dc_enable_stereo( struct dc_stream_state *streams[], uint8_t stream_count); +/* Triggers multi-stream synchronization. */ +void dc_trigger_sync(struct dc *dc, struct dc_state *context); enum surface_update_type dc_check_update_surfaces_for_stream( struct dc *dc, |