Commit 4b61b8a3 authored by Mario Limonciello's avatar Mario Limonciello Committed by Alex Deucher
Browse files

drm/amd/display: Add debugging message for brightness caps 



[Why]
Default BIOS brightness caps are buried in ACPI.

[How]
Add extra dynamic debug that can show default brightness caps.

Reviewed-by: default avatarAlex Hung <alex.hung@amd.com>
Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Signed-off-by: default avatarWayne Lin <wayne.lin@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent c73375d9

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

+6 −1
Original line number Diff line number Diff line
@@ -4910,6 +4910,7 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector) 
	struct backlight_properties props = { 0 };

	struct amdgpu_dm_backlight_caps caps = { 0 };

	char bl_name[16];

	int min, max;



	if (aconnector->bl_idx == -1)

		return;
@@ -4922,11 +4923,15 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector) 
	}



	amdgpu_acpi_get_backlight_caps(&caps);

	if (caps.caps_valid) {

	if (caps.caps_valid && get_brightness_range(&caps, &min, &max)) {

		if (power_supply_is_system_supplied() > 0)

			props.brightness = caps.ac_level;

		else

			props.brightness = caps.dc_level;

		/* min is zero, so max needs to be adjusted */

		props.max_brightness = max - min;

		drm_dbg(drm, "Backlight caps: min: %d, max: %d, ac %d, dc %d\n", min, max,

			caps.ac_level, caps.dc_level);

	} else

		props.brightness = AMDGPU_MAX_BL_LEVEL;