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| author | Krunoslav Kovac <Krunoslav.Kovac@amd.com> | 2019-10-04 13:49:03 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-10-25 16:50:09 -0400 |
| commit | 50575eb5b339683ee148189beae5eb53ccb3158b (patch) | |
| tree | bb307747c9a5f358152f0faee5ea81cd8016beed /drivers/gpu/drm/amd/display | |
| parent | 622a88c8259e2e517e7145595715d661774c859e (diff) | |
| download | linux-50575eb5b339683ee148189beae5eb53ccb3158b.tar.bz2 | |
drm/amd/display: Only use EETF when maxCL > max display
[Why&How]
BT.2390 EETF is used for tone mapping/range reduction.
Say display is 0.1 - 500 nits.
The problematic case is when content is 0-400. We apply EETF because
0<0.1 so we need to reduce the range by 0.1.
In the commit, we ignore the bottom range. Most displays map 0 to min and
then have a ramp to 0.1, so sending 0.1 is actually >0.1.
Furthermode, HW that uses 3D LUT also assumes min=0.
Signed-off-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display')
| -rw-r--r-- | drivers/gpu/drm/amd/display/modules/color/color_gamma.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c index 85dad356c9d5..1de4805cb8c7 100644 --- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c +++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c @@ -959,11 +959,7 @@ static bool build_freesync_hdr(struct pwl_float_data_ex *rgb_regamma, if (fs_params->max_display < 100) // cap at 100 at the top max_display = dc_fixpt_from_int(100); - if (fs_params->min_content < fs_params->min_display) - use_eetf = true; - else - min_content = min_display; - + // only max used, we don't adjust min luminance if (fs_params->max_content > fs_params->max_display) use_eetf = true; else |