From: Jaehyun Chung <jaehyun.ch...@amd.com>
[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.ko...@amd.com>
Acked-by: Mikita Lipski <mikita.lip...@amd.com>
Signed-off-by: Jaehyun Chung <jaehyun.ch...@amd.com>
---
.../amd/display/modules/color/color_gamma.c | 64 ++++++++-----------
1 file changed, 25 insertions(+), 39 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
index 2465c88e2879..64a38f08f497 100644
--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
+++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
@@ -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) {
--
2.25.1
