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drm/amd/display: Allow backlight to go below AMDGPU_DM_DEFAULT_MIN_BACKLIGHT

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[ Upstream commit 87d749a6aa ]

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@amd.com>
Cc: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/amd-gfx/be04226a-a9e3-4a45-a83b-6d263c6557d8@t-8ch.de/T/#m400dee4e2fc61fe9470334d20a7c8c89c9aef44f
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mario Limonciello 2024-09-15 14:28:37 -05:00 committed by Greg Kroah-Hartman
parent 54ad9c7608
commit a94ec40b94
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -4064,7 +4064,7 @@ 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",