From: Vitaly Prosyak <vitaly.prosyak@xxxxxxx>
Low level calculation methods.
Signed-off-by: Vitaly Prosyak <vitaly.prosyak at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Harry Wentland <harry.wentland at amd.com>
---
drivers/gpu/drm/amd/display/dc/dc.h | 2 +
.../amd/display/modules/color/color_gamma.c | 137 ++++++++++++++++++
2 files changed, 139 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 22d113eca452..7a70a24ef736 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -378,6 +378,8 @@ enum dc_transfer_func_predefined {
TRANSFER_FUNCTION_PQ,
TRANSFER_FUNCTION_LINEAR,
TRANSFER_FUNCTION_UNITY,
+ TRANSFER_FUNCTION_HLG,
+ TRANSFER_FUNCTION_HLG12
};
struct dc_transfer_func {
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 e803b375e835..fa9a199d5639 100644
--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
+++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
@@ -131,6 +131,63 @@ static void compute_de_pq(struct fixed31_32 in_x, struct fixed31_32 *out_y)
dc_fixpt_div(dc_fixpt_one, m1));
}
+
+/*de gamma, none linear to linear*/
+static void compute_hlg_oetf(struct fixed31_32 in_x, bool is_light0_12, struct fixed31_32 *out_y)
+{
+ struct fixed31_32 a;
+ struct fixed31_32 b;
+ struct fixed31_32 c;
+ struct fixed31_32 threshold;
+ struct fixed31_32 reference_white_level;
+
+ a = dc_fixpt_from_fraction(17883277, 100000000);
+ if (is_light0_12) {
+ /*light 0-12*/
+ b = dc_fixpt_from_fraction(28466892, 100000000);
+ c = dc_fixpt_from_fraction(55991073, 100000000);
+ threshold = dc_fixpt_one;
+ reference_white_level = dc_fixpt_half;
+ } else {
+ /*light 0-1*/
+ b = dc_fixpt_from_fraction(2372241, 100000000);
+ c = dc_fixpt_add(dc_fixpt_one, dc_fixpt_from_fraction(429347, 100000000));
+ threshold = dc_fixpt_from_fraction(1, 12);
+ reference_white_level = dc_fixpt_pow(dc_fixpt_from_fraction(3, 1), dc_fixpt_half);
+ }
+ if (dc_fixpt_lt(threshold, in_x))
+ *out_y = dc_fixpt_add(c, dc_fixpt_mul(a, dc_fixpt_log(dc_fixpt_sub(in_x, b))));
+ else
+ *out_y = dc_fixpt_mul(dc_fixpt_pow(in_x, dc_fixpt_half), reference_white_level);
+}
+
+/*re gamma, linear to none linear*/
+static void compute_hlg_eotf(struct fixed31_32 in_x, bool is_light0_12, struct fixed31_32 *out_y)
+{
+ struct fixed31_32 a;
+ struct fixed31_32 b;
+ struct fixed31_32 c;
+ struct fixed31_32 reference_white_level;
+
+ a = dc_fixpt_from_fraction(17883277, 100000000);
+ if (is_light0_12) {
+ /*light 0-12*/
+ b = dc_fixpt_from_fraction(28466892, 100000000);
+ c = dc_fixpt_from_fraction(55991073, 100000000);
+ reference_white_level = dc_fixpt_from_fraction(4, 1);
+ } else {
+ /*light 0-1*/
+ b = dc_fixpt_from_fraction(2372241, 100000000);
+ c = dc_fixpt_add(dc_fixpt_one, dc_fixpt_from_fraction(429347, 100000000));
+ reference_white_level = dc_fixpt_from_fraction(1, 3);
+ }
+ if (dc_fixpt_lt(dc_fixpt_half, in_x))
+ *out_y = dc_fixpt_add(dc_fixpt_exp(dc_fixpt_div(dc_fixpt_sub(in_x, c), a)), b);
+ else
+ *out_y = dc_fixpt_mul(dc_fixpt_pow(in_x, dc_fixpt_from_fraction(2, 1)), reference_white_level);
+}
+
+
/* one-time pre-compute PQ values - only for sdr_white_level 80 */
void precompute_pq(void)
{
@@ -691,6 +748,48 @@ static void build_degamma(struct pwl_float_data_ex *curve,
}
}
+static void build_hlg_degamma(struct pwl_float_data_ex *degamma,
+ uint32_t hw_points_num,
+ const struct hw_x_point *coordinate_x, bool is_light0_12)
+{
+ uint32_t i;
+
+ struct pwl_float_data_ex *rgb = degamma;
+ const struct hw_x_point *coord_x = coordinate_x;
+
+ i = 0;
+
+ while (i != hw_points_num + 1) {
+ compute_hlg_oetf(coord_x->x, is_light0_12, &rgb->r);
+ rgb->g = rgb->r;
+ rgb->b = rgb->r;
+ ++coord_x;
+ ++rgb;
+ ++i;
+ }
+}
+
+static void build_hlg_regamma(struct pwl_float_data_ex *regamma,
+ uint32_t hw_points_num,
+ const struct hw_x_point *coordinate_x, bool is_light0_12)
+{
+ uint32_t i;
+
+ struct pwl_float_data_ex *rgb = regamma;
+ const struct hw_x_point *coord_x = coordinate_x;
+
+ i = 0;
+
+ while (i != hw_points_num + 1) {
+ compute_hlg_eotf(coord_x->x, is_light0_12, &rgb->r);
+ rgb->g = rgb->r;
+ rgb->b = rgb->r;
+ ++coord_x;
+ ++rgb;
+ ++i;
+ }
+}
+
static void scale_gamma(struct pwl_float_data *pwl_rgb,
const struct dc_gamma *ramp,
struct dividers dividers)
@@ -1614,6 +1713,25 @@ bool mod_color_calculate_curve(enum dc_transfer_func_predefined trans,
}
ret = true;
+ kvfree(rgb_regamma);
+ } else if (trans == TRANSFER_FUNCTION_HLG ||
+ trans == TRANSFER_FUNCTION_HLG12) {
+ rgb_regamma = kvzalloc(sizeof(*rgb_regamma) *
+ (MAX_HW_POINTS + _EXTRA_POINTS),
+ GFP_KERNEL);
+ if (!rgb_regamma)
+ goto rgb_regamma_alloc_fail;
+
+ build_hlg_regamma(rgb_regamma,
+ MAX_HW_POINTS,
+ coordinates_x,
+ trans == TRANSFER_FUNCTION_HLG12 ? true:false);
+ for (i = 0; i <= MAX_HW_POINTS ; i++) {
+ points->red[i] = rgb_regamma[i].r;
+ points->green[i] = rgb_regamma[i].g;
+ points->blue[i] = rgb_regamma[i].b;
+ }
+ ret = true;
kvfree(rgb_regamma);
}
rgb_regamma_alloc_fail:
@@ -1674,6 +1792,25 @@ bool mod_color_calculate_degamma_curve(enum dc_transfer_func_predefined trans,
}
ret = true;
+ kvfree(rgb_degamma);
+ } else if (trans == TRANSFER_FUNCTION_HLG ||
+ trans == TRANSFER_FUNCTION_HLG12) {
+ rgb_degamma = kvzalloc(sizeof(*rgb_degamma) *
+ (MAX_HW_POINTS + _EXTRA_POINTS),
+ GFP_KERNEL);
+ if (!rgb_degamma)
+ goto rgb_degamma_alloc_fail;
+
+ build_hlg_degamma(rgb_degamma,
+ MAX_HW_POINTS,
+ coordinates_x,
+ trans == TRANSFER_FUNCTION_HLG12 ? true:false);
+ for (i = 0; i <= MAX_HW_POINTS ; i++) {
+ points->red[i] = rgb_degamma[i].r;
+ points->green[i] = rgb_degamma[i].g;
+ points->blue[i] = rgb_degamma[i].b;
+ }
+ ret = true;
kvfree(rgb_degamma);
}
points->end_exponent = 0;
--
2.17.0
