This is a note to let you know that I've just added the patch titled
drm/amd/display: Fix artifacting on eDP panels when engaging freesync video mode
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-fix-artifacting-on-edp-panels-when-e.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2d93f65ccdff98ba59f1c577aac05280c5a2a12c
Author: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Date: Wed May 17 14:39:46 2023 -0400
drm/amd/display: Fix artifacting on eDP panels when engaging freesync video mode
[ Upstream commit b18f05a0666aecd5cb19c26a8305bcfa4e9d6502 ]
[Why]
When freesync video mode is enabled, switching resolution from native
mode to one of the freesync video compatible modes can trigger continous
artifacts on some eDP panels when running under KDE. The articating can be seen in the
attached bug report.
[How]
Fix this by restricting updates that require full commit by using the same checks
for stream and scaling changes in the the enable pass of dm_update_crtc_state()
along with the check for compatible timings for freesync vide mode.
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2162
Fixes: da5e14909776 ("drm/amd/display: Fix hang when skipping modeset")
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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 be863af956bb0..79ac19948e7af 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -10209,6 +10209,8 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
/* Now check if we should set freesync video mode */
if (amdgpu_freesync_vid_mode && 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) &&
is_timing_unchanged_for_freesync(new_crtc_state,
old_crtc_state)) {
new_crtc_state->mode_changed = false;
