This is a note to let you know that I've just added the patch titled
drm/amd/display: Allow backlight to go below `AMDGPU_DM_DEFAULT_MIN_BACKLIGHT`
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-allow-backlight-to-go-below-amdgpu_d.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 e938c49a75c60973d6bb55f231e1763b75c6db19
Author: Mario Limonciello <mario.limonciello@xxxxxxx>
Date: Sun Sep 15 14:28:37 2024 -0500
drm/amd/display: Allow backlight to go below `AMDGPU_DM_DEFAULT_MIN_BACKLIGHT`
[ Upstream commit 87d749a6aab73d8069d0345afaa98297816cb220 ]
The issue with panel power savings compatibility below
`AMDGPU_DM_DEFAULT_MIN_BACKLIGHT` happens at
`AMDGPU_DM_DEFAULT_MIN_BACKLIGHT` as well.
That issue will be fixed separately, so don't prevent the backlight
brightness from going that low.
Cc: Harry Wentland <harry.wentland@xxxxxxx>
Cc: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/amd-gfx/be04226a-a9e3-4a45-a83b-6d263c6557d8@xxxxxxxx/T/#m400dee4e2fc61fe9470334d20a7c8c89c9aef44f
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@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 f964e79babdb5..bfa15d8959553 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3936,7 +3936,7 @@ static void amdgpu_dm_update_backlight_caps(struct amdgpu_display_manager *dm,
int spread = caps.max_input_signal - caps.min_input_signal;
if (caps.max_input_signal > AMDGPU_DM_DEFAULT_MAX_BACKLIGHT ||
- caps.min_input_signal < AMDGPU_DM_DEFAULT_MIN_BACKLIGHT ||
+ caps.min_input_signal < 0 ||
spread > AMDGPU_DM_DEFAULT_MAX_BACKLIGHT ||
spread < AMDGPU_DM_MIN_SPREAD) {
DRM_DEBUG_KMS("DM: Invalid backlight caps: min=%d, max=%d\n",
