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drm/amd: Pass luminance data to amdgpu_dm_backlight_caps

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The ATIF method on some systems will provide a backlight curve. Pass
this curve into amdgpu_dm add it to the structures.

Reviewed-by: Alex Hung <alex.hung@amd.com>
Link: https://lore.kernel.org/r/20250228185145.186319-3-mario.limonciello@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 2025-02-28 12:51:42 -06:00 committed by Alex Deucher
parent 1c79b5fcdf
commit f729e63743
3 changed files with 27 additions and 1 deletions
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4
drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
View File

@ -394,6 +394,10 @@ static int amdgpu_atif_query_backlight_caps(struct amdgpu_atif *atif)
characteristics.max_input_signal;
atif->backlight_caps.ac_level = characteristics.ac_level;
atif->backlight_caps.dc_level = characteristics.dc_level;
atif->backlight_caps.data_points = characteristics.number_of_points;
memcpy(atif->backlight_caps.luminance_data,
characteristics.data_points,
sizeof(atif->backlight_caps.luminance_data));
out:
kfree(info);
return err;

20
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
View File

@ -151,6 +151,18 @@ struct idle_workqueue {
bool running;
};
#define MAX_LUMINANCE_DATA_POINTS 99
/**
* struct amdgpu_dm_luminance_data - Custom luminance data
* @luminance: Luminance in percent
* @input_signal: Input signal in range 0-255
*/
struct amdgpu_dm_luminance_data {
u8 luminance;
u8 input_signal;
} __packed;
/**
* struct amdgpu_dm_backlight_caps - Information about backlight
*
@ -195,6 +207,14 @@ struct amdgpu_dm_backlight_caps {
* @dc_level: the default brightness if booted on DC
*/
u8 dc_level;
/**
* @data_points: the number of custom luminance data points
*/
u8 data_points;
/**
* @luminance_data: custom luminance data
*/
struct amdgpu_dm_luminance_data luminance_data[MAX_LUMINANCE_DATA_POINTS];
};
/**

4
drivers/gpu/drm/amd/include/amd_acpi.h
View File

@ -61,7 +61,7 @@ struct atif_qbtc_arguments {
struct atif_qbtc_data_point {
u8 luminance; /* luminance in percent */
u8 ipnut_signal; /* input signal in range 0-255 */
u8 input_signal; /* input signal in range 0-255 */
} __packed;
struct atif_qbtc_output {
@ -75,6 +75,8 @@ struct atif_qbtc_output {
u8 number_of_points; /* number of data points */
struct atif_qbtc_data_point data_points[ATIF_QBTC_MAX_DATA_POINTS];
} __packed;
static_assert(ATIF_QBTC_MAX_DATA_POINTS == MAX_LUMINANCE_DATA_POINTS);
static_assert(sizeof(struct atif_qbtc_data_point) == sizeof(struct amdgpu_dm_luminance_data));
#define ATIF_NOTIFY_MASK 0x3
#define ATIF_NOTIFY_NONE 0