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drm/amd/display: change dc stream color settings only in atomic commit

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Don't update DC stream color components during atomic check. The driver
will continue validating the new CRTC color state but will not change DC
stream color components. The DC stream color state will only be
programmed at commit time in the `atomic_setup_commit` stage.

It fixes gamma LUT loss reported by KDE users when changing brightness
quickly or changing Display settings (such as overscan) with nightlight
on and HDR. As KWin can do a test commit with color settings different
from those that should be applied in a non-test-only commit, if the
driver changes DC stream color state in atomic check, this state can be
eventually HW programmed in commit tail, instead of the respective state
set by the non-blocking commit.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4444
Reported-by: Xaver Hugl <xaver.hugl@gmail.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Melissa Wen
2025-09-11 14:21:20 -03:00
committed by Alex Deucher
parent 2330437da0
commit 51cb93aa0c
3 changed files with 66 additions and 24 deletions
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2
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -11210,7 +11210,7 @@ skip_modeset:
if (dm_new_crtc_state->base.color_mgmt_changed ||
dm_old_crtc_state->regamma_tf != dm_new_crtc_state->regamma_tf ||
drm_atomic_crtc_needs_modeset(new_crtc_state)) {
ret = amdgpu_dm_update_crtc_color_mgmt(dm_new_crtc_state);
ret = amdgpu_dm_check_crtc_color_mgmt(dm_new_crtc_state, true);
if (ret)
goto fail;
}