diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/modules/color/color_gamma.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/modules/color/color_gamma.c | 32 |
1 files changed, 19 insertions, 13 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 ef742d95ef05..64a38f08f497 100644 --- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c +++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c @@ -54,12 +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 gamma_numerator01[] = { 31308, 180000, 0, 0, 0}; -static const int32_t gamma_numerator02[] = { 12920, 4500, 0, 0, 0}; -static const int32_t gamma_numerator03[] = { 55, 99, 0, 0, 0}; -static const int32_t gamma_numerator04[] = { 55, 99, 0, 0, 0}; -static const int32_t gamma_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) @@ -288,7 +293,8 @@ struct dividers { }; -static bool build_coefficients(struct gamma_coefficients *coefficients, enum dc_transfer_func_predefined type) +static bool build_coefficients(struct gamma_coefficients *coefficients, + enum dc_transfer_func_predefined type) { uint32_t i = 0; @@ -312,15 +318,15 @@ static bool build_coefficients(struct gamma_coefficients *coefficients, enum dc_ do { coefficients->a0[i] = dc_fixpt_from_fraction( - gamma_numerator01[index], 10000000); + numerator01[index], 10000000); coefficients->a1[i] = dc_fixpt_from_fraction( - gamma_numerator02[index], 1000); + numerator02[index], 1000); coefficients->a2[i] = dc_fixpt_from_fraction( - gamma_numerator03[index], 1000); + numerator03[index], 1000); coefficients->a3[i] = dc_fixpt_from_fraction( - gamma_numerator04[index], 1000); + numerator04[index], 1000); coefficients->user_gamma[i] = dc_fixpt_from_fraction( - gamma_numerator05[index], 1000); + numerator05[index], 1000); ++i; } while (i != ARRAY_SIZE(coefficients->a0)); @@ -1685,7 +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); + build_coefficients(&coeff, true); i = 0; while (i != hw_points_num + 1) { |