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drm/amd/display: Set default backlight without ACPI support

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[Why]
If BIOS doesn't include ATIF method it will not specify default AC or DC
levels. This means that backlight will always start at 0%, which isn't
expected behavior.

[How]
Set default AC and DC level when no valid caps found.  Also reduce code
duplication for ACPI and non-ACPI cases.

Reported-by: Edson Juliano Drosdeck <edson.drosdeck@gmail.com>
Closes: https://lore.kernel.org/dri-devel/20260526210048.1162477-1-edson.drosdeck@gmail.com/
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Limonciello 2026-06-04 09:38:12 -05:00 committed by Alex Deucher
parent 3576a045cd
commit e3d0810f50
1 changed files with 6 additions and 10 deletions
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16
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_backlight.c
View File

@ -78,20 +78,16 @@ void amdgpu_dm_update_backlight_caps(struct amdgpu_display_manager *dm,
caps->caps_valid = false;
}
}
if (!caps->caps_valid) {
caps->min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
caps->max_input_signal = AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
caps->caps_valid = true;
}
#else
if (caps->aux_support)
return;
caps->min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
caps->max_input_signal = AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
caps->caps_valid = true;
#endif
if (!caps->caps_valid) {
caps->min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
caps->max_input_signal = AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
caps->ac_level = caps->dc_level = 50;
caps->caps_valid = true;
}
}
EXPORT_IF_KUNIT(amdgpu_dm_update_backlight_caps);