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drm/amd/display: Fix backlight control for luminance-capable OLED

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[WHY]
For some eDP panels VESA aux backlight control is necessary,
otherwise they stay black.

[HOW]
When AUX backlight control is used, select BACKLIGHT_CONTROL_VESA_AUX for
panels that advertise panel_luminance_control.

Reviewed-by: Hansen Dsouza <hansen.dsouza@amd.com>
Signed-off-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 42f698bd061d76d5f4c84a195e465cfbeec775e4)
This commit is contained in:
Roman Li 2026-08-21 12:19:10 -04:00 committed by Alex Deucher
parent 93a77d353c
commit 5a67d2e055
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_backlight.c
View File

@ -534,8 +534,12 @@ void amdgpu_dm_update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
else if (!IS_ERR_OR_NULL(panel_backlight_quirk) &&
panel_backlight_quirk->force_pwm)
caps->aux_support = false;
if (caps->aux_support)
aconnector->dc_link->backlight_control_type = BACKLIGHT_CONTROL_AMD_AUX;
if (caps->aux_support) {
if (aconnector->dc_link->dpcd_caps.panel_luminance_control)
aconnector->dc_link->backlight_control_type = BACKLIGHT_CONTROL_VESA_AUX;
else
aconnector->dc_link->backlight_control_type = BACKLIGHT_CONTROL_AMD_AUX;
}
luminance_range = &conn_base->display_info.luminance_range;