diff options
| author | Victor Lu <victorchengchi.lu@amd.com> | 2020-07-21 12:08:34 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-08-04 17:29:28 -0400 |
| commit | 3d4e52d0cf24b424c668fa8ab1269725796d4ec4 (patch) | |
| tree | 995005ae2f83fe501d44be137c1eee7f970f6ff2 /drivers/gpu/drm/amd/display/dc/core | |
| parent | da83b385f3eba1d695bc8014d8a5c0a791188c16 (diff) | |
| download | linux-3d4e52d0cf24b424c668fa8ab1269725796d4ec4.tar.bz2 | |
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/core')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c index 92eb1ca1634f..5aa3b89471c3 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c @@ -1238,6 +1238,14 @@ bool dc_enable_stereo( return ret; } +void dc_trigger_sync(struct dc *dc, struct dc_state *context) +{ + if (context->stream_count > 1 && !dc->debug.disable_timing_sync) { + enable_timing_multisync(dc, context); + program_timing_sync(dc, context); + } +} + /* * Applies given context to HW and copy it into current context. * It's up to the user to release the src context afterwards. @@ -1297,10 +1305,7 @@ static enum dc_status dc_commit_state_no_check(struct dc *dc, struct dc_state *c if (result != DC_OK) return result; - if (context->stream_count > 1 && !dc->debug.disable_timing_sync) { - enable_timing_multisync(dc, context); - program_timing_sync(dc, context); - } + dc_trigger_sync(dc, context); /* Program all planes within new context*/ if (dc->hwss.program_front_end_for_ctx) { |