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drm/amd/display: Fix low black values by increasing error

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[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>
This commit is contained in:
Peterson 2024-09-23 10:30:50 -04:00 committed by Alex Deucher
parent 21b673da51
commit eda7f2e9bb
2 changed files with 18 additions and 28 deletions
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23
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
View File

@ -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;
const uint8_t SEG_COUNT = 12;
region_start = -10;
for (i = 0; i < SEG_COUNT; i++)
seg_distr[i] = 4;
seg_distr[SEG_COUNT] = 1;
region_start = -SEG_COUNT;
region_end = 1;
}

23
drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c
View File

@ -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;
const uint8_t SEG_COUNT = 12;
region_start = -10;
for (i = 0; i < SEG_COUNT; i++)
seg_distr[i] = 4;
seg_distr[SEG_COUNT] = 1;
region_start = -SEG_COUNT;
region_end = 1;
}