diff options
| author | Peterson <peterson.guo@amd.com> | 2024-09-23 10:30:50 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2024-10-07 14:12:01 -0400 |
| commit | eda7f2e9bb3b6ba16cb19e521b433b22b220c0d0 (patch) | |
| tree | fb04411f874cfcc6abbd1609c4aba30fcbacbace /drivers/gpu/drm/amd/display | |
| parent | 21b673da5192e1212059caf1154c3749a9be66fa (diff) | |
drm/amd/display: Fix low black values by increasing error
[WHY]
Regamma resolution for the first few black levels can have problems for
calibration.
[HOW]
HW LUT is divided into N power-of-2 regions each with K segments. For
SDR mode we set min point at 2^-10 and increments of 2^-13. It's
generally more than 8-bit SDR needs, but some calibration tools and API
use 12-bit curves.
The fix shifts starting point to 2^-12 and starting increments at 2^-16.
Reviewed-by: Krunoslav Kovac <krunoslav.kovac@amd.com>
Signed-off-by: Peterson <peterson.guo@amd.com>
Signed-off-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@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/dc/dcn10/dcn10_cm_common.c | 25 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c | 25 |
2 files changed, 20 insertions, 30 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c index eaed5d1c398a..dcd2cdfe91eb 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c @@ -365,23 +365,18 @@ bool cm_helper_translate_curve_to_hw_format(struct dc_context *ctx, region_start = -MAX_LOW_POINT; region_end = NUMBER_REGIONS - MAX_LOW_POINT; } else { - /* 11 segments - * segment is from 2^-10 to 2^1 + /* 13 segments + * segment is from 2^-12 to 2^0 * There are less than 256 points, for optimization */ - seg_distr[0] = 3; - seg_distr[1] = 4; - seg_distr[2] = 4; - seg_distr[3] = 4; - seg_distr[4] = 4; - seg_distr[5] = 4; - seg_distr[6] = 4; - seg_distr[7] = 4; - seg_distr[8] = 4; - seg_distr[9] = 4; - seg_distr[10] = 1; - - region_start = -10; + const uint8_t SEG_COUNT = 12; + + for (i = 0; i < SEG_COUNT; i++) + seg_distr[i] = 4; + + seg_distr[SEG_COUNT] = 1; + + region_start = -SEG_COUNT; region_end = 1; } diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c index f31f0e3abfc0..1e1038fb04e8 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c +++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c @@ -140,23 +140,18 @@ bool cm3_helper_translate_curve_to_hw_format( region_start = -MAX_LOW_POINT; region_end = NUMBER_REGIONS - MAX_LOW_POINT; } else { - /* 11 segments - * segment is from 2^-10 to 2^0 + /* 13 segments + * segment is from 2^-12 to 2^0 * There are less than 256 points, for optimization */ - seg_distr[0] = 3; - seg_distr[1] = 4; - seg_distr[2] = 4; - seg_distr[3] = 4; - seg_distr[4] = 4; - seg_distr[5] = 4; - seg_distr[6] = 4; - seg_distr[7] = 4; - seg_distr[8] = 4; - seg_distr[9] = 4; - seg_distr[10] = 1; - - region_start = -10; + const uint8_t SEG_COUNT = 12; + + for (i = 0; i < SEG_COUNT; i++) + seg_distr[i] = 4; + + seg_distr[SEG_COUNT] = 1; + + region_start = -SEG_COUNT; region_end = 1; } |