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drm/amd/display: Revert adding degamma coefficients

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[Why]
Degamma coefficients are calculated in our degamma formula using
the regamma coefficients. We do not need to add separate degamma
coefficients.

[How]
Remove the change to add separate degamma coefficients.

Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Jaehyun Chung <jaehyun.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jaehyun Chung 2021-08-30 16:46:42 -04:00 committed by Alex Deucher
parent db7b568e6d
commit 9b3d76527f
1 changed files with 24 additions and 38 deletions
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62
drivers/gpu/drm/amd/display/modules/color/color_gamma.c
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@ -54,18 +54,17 @@ static struct hw_x_point coordinates_x[MAX_HW_POINTS + 2];
* just multiply with 2^gamma which can be computed once, and save the result so we
* recursively compute all the values.
*/
/*sRGB 709 2.2 2.4 P3*/
static const int32_t regamma_numerator01[] = { 31308, 180000, 0, 0, 0};
static const int32_t regamma_numerator02[] = { 12920, 4500, 0, 0, 0};
static const int32_t regamma_numerator03[] = { 55, 99, 0, 0, 0};
static const int32_t regamma_numerator04[] = { 55, 99, 0, 0, 0};
static const int32_t regamma_numerator05[] = { 2400, 2200, 2200, 2400, 2600};
static const int32_t degamma_numerator01[] = { 404500, 180000, 0, 0, 0};
static const int32_t degamma_numerator02[] = { 12920, 4500, 0, 0, 0};
static const int32_t degamma_numerator03[] = { 55, 99, 0, 0, 0};
static const int32_t degamma_numerator04[] = { 55, 99, 0, 0, 0};
static const int32_t degamma_numerator05[] = { 2400, 2200, 2200, 2400, 2600};
/*
* Regamma coefficients are used for both regamma and degamma. Degamma
* coefficients are calculated in our formula using the regamma coefficients.
*/
/*sRGB 709 2.2 2.4 P3*/
static const int32_t numerator01[] = { 31308, 180000, 0, 0, 0};
static const int32_t numerator02[] = { 12920, 4500, 0, 0, 0};
static const int32_t numerator03[] = { 55, 99, 0, 0, 0};
static const int32_t numerator04[] = { 55, 99, 0, 0, 0};
static const int32_t numerator05[] = { 2400, 2200, 2200, 2400, 2600};
/* one-time setup of X points */
void setup_x_points_distribution(void)
@ -295,7 +294,7 @@ struct dividers {
static bool build_coefficients(struct gamma_coefficients *coefficients,
enum dc_transfer_func_predefined type, bool isRegamma)
enum dc_transfer_func_predefined type)
{
uint32_t i = 0;
@ -318,29 +317,16 @@ static bool build_coefficients(struct gamma_coefficients *coefficients,
}
do {
if (isRegamma) {
coefficients->a0[i] = dc_fixpt_from_fraction(
regamma_numerator01[index], 10000000);
coefficients->a1[i] = dc_fixpt_from_fraction(
regamma_numerator02[index], 1000);
coefficients->a2[i] = dc_fixpt_from_fraction(
regamma_numerator03[index], 1000);
coefficients->a3[i] = dc_fixpt_from_fraction(
regamma_numerator04[index], 1000);
coefficients->user_gamma[i] = dc_fixpt_from_fraction(
regamma_numerator05[index], 1000);
} else {
coefficients->a0[i] = dc_fixpt_from_fraction(
degamma_numerator01[index], 10000000);
coefficients->a1[i] = dc_fixpt_from_fraction(
degamma_numerator02[index], 1000);
coefficients->a2[i] = dc_fixpt_from_fraction(
degamma_numerator03[index], 1000);
coefficients->a3[i] = dc_fixpt_from_fraction(
degamma_numerator04[index], 1000);
coefficients->user_gamma[i] = dc_fixpt_from_fraction(
degamma_numerator05[index], 1000);
}
coefficients->a0[i] = dc_fixpt_from_fraction(
numerator01[index], 10000000);
coefficients->a1[i] = dc_fixpt_from_fraction(
numerator02[index], 1000);
coefficients->a2[i] = dc_fixpt_from_fraction(
numerator03[index], 1000);
coefficients->a3[i] = dc_fixpt_from_fraction(
numerator04[index], 1000);
coefficients->user_gamma[i] = dc_fixpt_from_fraction(
numerator05[index], 1000);
++i;
} while (i != ARRAY_SIZE(coefficients->a0));
@ -853,7 +839,7 @@ static bool build_regamma(struct pwl_float_data_ex *rgb_regamma,
if (!coeff)
goto release;
if (!build_coefficients(coeff, type, true))
if (!build_coefficients(coeff, type))
goto release;
memset(cal_buffer->buffer, 0, NUM_PTS_IN_REGION * sizeof(struct fixed31_32));
@ -1102,7 +1088,7 @@ static bool build_degamma(struct pwl_float_data_ex *curve,
uint32_t begin_index, end_index;
bool ret = false;
if (!build_coefficients(&coeff, type, false))
if (!build_coefficients(&coeff, type))
goto release;
i = 0;
@ -1705,7 +1691,7 @@ static void apply_degamma_for_user_regamma(struct pwl_float_data_ex *rgb_regamma
struct pwl_float_data_ex *rgb = rgb_regamma;
const struct hw_x_point *coord_x = coordinates_x;
build_coefficients(&coeff, TRANSFER_FUNCTION_SRGB, true);
build_coefficients(&coeff, true);
i = 0;
while (i != hw_points_num + 1) {