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 20 additions and 30 deletions

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23

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c

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23

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c

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