diff options
| author | Mario Limonciello <mario.limonciello@amd.com> | 2025-09-04 13:49:35 -0500 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2025-09-23 10:26:56 -0400 |
| commit | 6cec25f5b5660602b1953038cf40968b2d71c403 (patch) | |
| tree | bc742c90648c55ae3c52a7a4e8ae7b7a4ffefcba /drivers/gpu/drm/amd/display/amdgpu_dm | |
| parent | drm/amd/display: Add monitor patch to read psr cap again (diff) | |
| download | linux-6cec25f5b5660602b1953038cf40968b2d71c403.tar.gz linux-6cec25f5b5660602b1953038cf40968b2d71c403.zip | |
drm/amd/display: Handle interpolation for first data point
[Why]
If the first data point for a custom brightness curve is not 0% luminance
then the first few luminance values will be ignored.
[How]
Check signal is below first data point and if so do linear interpolation to
0 instead.
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 |
1 files changed, 10 insertions, 0 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 09427e056055..271ea1615178 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -4828,6 +4828,16 @@ static void convert_custom_brightness(const struct amdgpu_dm_backlight_caps *cap if (!caps->data_points) return; + /* + * Handle the case where brightness is below the first data point + * Interpolate between (0,0) and (first_signal, first_lum) + */ + if (brightness < caps->luminance_data[0].input_signal) { + lum = DIV_ROUND_CLOSEST(caps->luminance_data[0].luminance * brightness, + caps->luminance_data[0].input_signal); + goto scale; + } + left = 0; right = caps->data_points - 1; while (left <= right) { |