diff options
| author | Mario Limonciello <mario.limonciello@amd.com> | 2025-05-14 16:06:40 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-06 11:04:26 +0200 |
| commit | 6c56c8ec6f9762c33bd22f31d43af4194d12da53 (patch) | |
| tree | 28a08a694a9fdc6b9ddac6515cef8d75f8b14c49 | |
| parent | 66089fa8c9ed162744037ab0375e38cc74c7f7ed (diff) | |
drm/amd/display: Fix default DC and AC levels
commit 8b5f3a229a70d242322b78c8e13744ca00212def upstream.
[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: Alex Hung <alex.hung@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 09d95ee9283f..389748c420b0 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -4849,9 +4849,9 @@ 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, |