Commit f729e637 authored by Mario Limonciello's avatar Mario Limonciello Committed by Alex Deucher
Browse files

drm/amd: Pass luminance data to amdgpu_dm_backlight_caps 



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

Reviewed-by: default avatarAlex Hung <alex.hung@amd.com>
Link: https://lore.kernel.org/r/20250228185145.186319-3-mario.limonciello@amd.com


Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 1c79b5fc

drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

+20 −0
Original line number Diff line number Diff line
@@ -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];

};



/**

drivers/gpu/drm/amd/include/amd_acpi.h

+3 −1
Original line number Diff line number Diff line
@@ -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