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Commit 43610a9b authored by Vitaly Prosyak's avatar Vitaly Prosyak Committed by Alex Deucher
Browse files

drm/amd/display: HLG support 



Low level calculation methods.

Signed-off-by: default avatarVitaly Prosyak <vitaly.prosyak@amd.com>
Reviewed-by: default avatarTony Cheng <Tony.Cheng@amd.com>
Acked-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 1a05873f

drivers/gpu/drm/amd/display/dc/dc.h

+2 −0
Original line number Diff line number Diff line
@@ -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 {

drivers/gpu/drm/amd/display/modules/color/color_gamma.c

+137 −0
Original line number Diff line number Diff line
@@ -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;