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drm/amd/display: check if ext_caps is valid in BL setup

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LVDS connectors don't have extended backlight caps so check
if the pointer is valid before accessing it.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/5012
Fixes: 1454642960 ("drm/amd: Re-introduce property to control adaptive backlight modulation")
Cc: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 3f797396d7)
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher
2026-03-20 12:33:48 -04:00
parent 7150850146
commit 9da4f9964a
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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@@ -5423,7 +5423,7 @@ static void setup_backlight_device(struct amdgpu_display_manager *dm,
caps = &dm->backlight_caps[aconnector->bl_idx];
/* Only offer ABM property when non-OLED and user didn't turn off by module parameter */
if (!caps->ext_caps->bits.oled && amdgpu_dm_abm_level < 0)
if (caps->ext_caps && !caps->ext_caps->bits.oled && amdgpu_dm_abm_level < 0)
drm_object_attach_property(&aconnector->base.base,
dm->adev->mode_info.abm_level_property,
ABM_SYSFS_CONTROL);