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drm/amd/display: Fix regamma not affecting full-intensity color values 

Hardware understands the regamma LUT as a piecewise linear function,
with points spaced exponentially along the range. We previously
programmed the LUT for range [2^-10, 2^0). This causes (normalized)
color values of 1 (=2^0) to miss the programmed LUT, and fall onto the
end region.

For DCE, the end region is extrapolated using a single (base, slope)
pair, using the max y-value from the last point in the curve as base.
This presents a problem, since this value affects all three color
channels. Scaling down the intensity of say - the blue regamma curve -
will not affect it's end region. This is especially noticiable when
using RedShift. It scales down the blue and green channels, but leaves
full-intensity colors unshifted.

Therefore, extend the range to cover [2^-10, 2^1) by programming another
hardware segment, containing only one point. That way, we won't be
hitting the end region.

Note that things are a bit different for DCN, since the end region can
be set per-channel.

Signed-off-by: Leo (Sunpeng) Li <sunpeng.li@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Leo (Sunpeng) Li 2018-04-03 16:07:16 -04:00 committed by Alex Deucher
parent 1409bc6b2b
commit b2f3f5920d
1 changed files with 6 additions and 3 deletions
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9
drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
View File

@ -453,10 +453,13 @@ dce110_translate_regamma_to_hw_format(const struct dc_transfer_func *output_tf,
} else {
/* 10 segments
* segment is from 2^-10 to 2^0
* segment is from 2^-10 to 2^1
* We include an extra segment for range [2^0, 2^1). This is to
* ensure that colors with normalized values of 1 don't miss the
* LUT.
*/
region_start = -10;
region_end = 0;
region_end = 1;
seg_distr[0] = 4;
seg_distr[1] = 4;
@ -468,7 +471,7 @@ dce110_translate_regamma_to_hw_format(const struct dc_transfer_func *output_tf,
seg_distr[7] = 4;
seg_distr[8] = 4;
seg_distr[9] = 4;
seg_distr[10] = -1;
seg_distr[10] = 0;
seg_distr[11] = -1;
seg_distr[12] = -1;
seg_distr[13] = -1;