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drm/amd/display: programming last delta in output transfer function LUT to a correct value

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[Why]
Currently DAL programs negative slope for the last point of output
transfer function curve.

[How]
Applying a check for the last PWL point for RGB values not to be
smaller than previous. If smaller, initialize the last point values
to a sum of previous PWL value and previous PWL delta;

Signed-off-by: Vladimir Stempen <vladimir.stempen@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Vladimir Stempen 2020-01-27 13:07:45 -05:00 • committed by Alex Deucher
parent c01760d661
commit c11e57f050
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
View file

@ -316,6 +316,7 @@ bool cm_helper_translate_curve_to_hw_format(
struct pwl_result_data *rgb_resulted;
struct pwl_result_data *rgb;
struct pwl_result_data *rgb_plus_1;
struct pwl_result_data *rgb_minus_1;
int32_t region_start, region_end;
int32_t i;
@ -465,9 +466,20 @@ bool cm_helper_translate_curve_to_hw_format(
rgb = rgb_resulted;
rgb_plus_1 = rgb_resulted + 1;
rgb_minus_1 = rgb;
i = 1;
while (i != hw_points + 1) {
if (i >= hw_points - 1) {
if (dc_fixpt_lt(rgb_plus_1->red, rgb->red))
rgb_plus_1->red = dc_fixpt_add(rgb->red, rgb_minus_1->delta_red);
if (dc_fixpt_lt(rgb_plus_1->green, rgb->green))
rgb_plus_1->green = dc_fixpt_add(rgb->green, rgb_minus_1->delta_green);
if (dc_fixpt_lt(rgb_plus_1->blue, rgb->blue))
rgb_plus_1->blue = dc_fixpt_add(rgb->blue, rgb_minus_1->delta_blue);
}
rgb->delta_red = dc_fixpt_sub(rgb_plus_1->red, rgb->red);
rgb->delta_green = dc_fixpt_sub(rgb_plus_1->green, rgb->green);
rgb->delta_blue = dc_fixpt_sub(rgb_plus_1->blue, rgb->blue);
@ -482,6 +494,7 @@ bool cm_helper_translate_curve_to_hw_format(
}
++rgb_plus_1;
rgb_minus_1 = rgb;
++rgb;
++i;
}