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drm/amd/display: Set default brightness according to ACPI

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Currently, amdgpu will always set up the brightness at 100% when it
loads.  However this is jarring when the BIOS has it previously
programmed to a much lower value.

The ACPI ATIF method includes two members for "ac_level" and "dc_level".
These represent the default values that should be used if the system is
brought up in AC and DC respectively.

Use these values to set up the default brightness when the backlight
device is registered.

v2: squash in ACPI fix

Reviewed-by: Leo Li <sunpeng.li@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Limonciello
2024-06-07 01:02:28 -05:00
committed by Alex Deucher
parent ee3942d9ab
commit 2fe87f54ab
4 changed files with 24 additions and 1 deletions
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8
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
View File

@@ -180,6 +180,14 @@ struct amdgpu_dm_backlight_caps {
* @aux_support: Describes if the display supports AUX backlight.
*/
bool aux_support;
/**
* @ac_level: the default brightness if booted on AC
*/
u8 ac_level;
/**
* @dc_level: the default brightness if booted on DC
*/
u8 dc_level;
};
/**