Commit 8b5f3a22 authored by Mario Limonciello's avatar Mario Limonciello Committed by Alex Deucher
Browse files

drm/amd/display: Fix default DC and AC levels 

[Why]
DC and AC levels are advertised in a percentage, not a luminance.

[How]
Scale DC and AC levels to supported values.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4221


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 4b61b8a3

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

+2 −2
Original line number Diff line number Diff line
@@ -4925,9 +4925,9 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector) 
	amdgpu_acpi_get_backlight_caps(&caps);

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

		if (power_supply_is_system_supplied() > 0)

			props.brightness = caps.ac_level;

			props.brightness = (max - min) * DIV_ROUND_CLOSEST(caps.ac_level, 100);

		else

			props.brightness = caps.dc_level;

			props.brightness = (max - min) * DIV_ROUND_CLOSEST(caps.dc_level, 100);

		/* 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,