drm/amd/display: Add dpp_get_gamut_remap functions

We want to be able to read the DPP's gamut remap matrix.

v2:
- code-style and doc comments clean-up (Melissa)
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/basics/conversion.c

@@ -101,6 +101,40 @@ void convert_float_matrix(
 	}
 }
 
+static struct fixed31_32 int_frac_to_fixed_point(uint16_t arg,
+						 uint8_t integer_bits,
+						 uint8_t fractional_bits)
+{
+	struct fixed31_32 result;
+	uint16_t sign_mask = 1 << (fractional_bits + integer_bits);
+	uint16_t value_mask = sign_mask - 1;
+
+	result.value = (long long)(arg & value_mask) <<
+		       (FIXED31_32_BITS_PER_FRACTIONAL_PART - fractional_bits);
+
+	if (arg & sign_mask)
+		result = dc_fixpt_neg(result);
+
+	return result;
+}
+
+/**
+ * convert_hw_matrix - converts HW values into fixed31_32 matrix.
+ * @matrix: fixed point 31.32 matrix
+ * @reg: array of register values
+ * @buffer_size: size of the array of register values
+ *
+ * Converts HW register spec defined format S2D13 into a fixed-point 31.32
+ * matrix.
+ */
+void convert_hw_matrix(struct fixed31_32 *matrix,
+		       uint16_t *reg,
+		       uint32_t buffer_size)
+{
+	for (int i = 0; i < buffer_size; ++i)
+		matrix[i] = int_frac_to_fixed_point(reg[i], 2, 13);
+}
+
 static uint32_t find_gcd(uint32_t a, uint32_t b)
 {
 	uint32_t remainder;

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

@@ -41,6 +41,10 @@ void convert_float_matrix(
 void reduce_fraction(uint32_t num, uint32_t den,
 		uint32_t *out_num, uint32_t *out_den);
 
+void convert_hw_matrix(struct fixed31_32 *matrix,
+		       uint16_t *reg,
+		       uint32_t buffer_size);
+
 static inline unsigned int log_2(unsigned int num)
 {
 	return ilog2(num);

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c

@@ -62,6 +62,26 @@ void cm_helper_program_color_matrices(
 
 }
 
+void cm_helper_read_color_matrices(struct dc_context *ctx,
+				   uint16_t *regval,
+				   const struct color_matrices_reg *reg)
+{
+	uint32_t cur_csc_reg, regval0, regval1;
+	unsigned int i = 0;
+
+	for (cur_csc_reg = reg->csc_c11_c12;
+	     cur_csc_reg <= reg->csc_c33_c34; cur_csc_reg++) {
+		REG_GET_2(cur_csc_reg,
+				csc_c11, &regval0,
+				csc_c12, &regval1);
+
+		regval[2 * i] = regval0;
+		regval[(2 * i) + 1] = regval1;
+
+		i++;
+	}
+}
+
 void cm_helper_program_xfer_func(
 		struct dc_context *ctx,
 		const struct pwl_params *params,

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.h

@@ -114,5 +114,7 @@ bool cm_helper_translate_curve_to_degamma_hw_format(
 				const struct dc_transfer_func *output_tf,
 				struct pwl_params *lut_params);
 
-
+void cm_helper_read_color_matrices(struct dc_context *ctx,
+				   uint16_t *regval,
+				   const struct color_matrices_reg *reg);
 #endif

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp.c

@@ -543,7 +543,8 @@ static const struct dpp_funcs dcn10_dpp_funcs = {
 		.dpp_set_hdr_multiplier = dpp1_set_hdr_multiplier,
 		.dpp_program_blnd_lut = NULL,
 		.dpp_program_shaper_lut = NULL,
-		.dpp_program_3dlut = NULL
+		.dpp_program_3dlut = NULL,
+		.dpp_get_gamut_remap = dpp1_cm_get_gamut_remap,
 };
 
 static struct dpp_caps dcn10_dpp_cap = {

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp.h

@@ -1521,4 +1521,7 @@ void dpp1_construct(struct dcn10_dpp *dpp1,
 	const struct dcn_dpp_registers *tf_regs,
 	const struct dcn_dpp_shift *tf_shift,
 	const struct dcn_dpp_mask *tf_mask);
+
+void dpp1_cm_get_gamut_remap(struct dpp *dpp_base,
+			     struct dpp_grph_csc_adjustment *adjust);
 #endif

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_cm.c

@@ -181,6 +181,74 @@ void dpp1_cm_set_gamut_remap(
 	}
 }
 
+static void read_gamut_remap(struct dcn10_dpp *dpp,
+			     uint16_t *regval,
+			     enum gamut_remap_select *select)
+{
+	struct color_matrices_reg gam_regs;
+	uint32_t selection;
+
+	REG_GET(CM_GAMUT_REMAP_CONTROL,
+					CM_GAMUT_REMAP_MODE, &selection);
+
+	*select = selection;
+
+	gam_regs.shifts.csc_c11 = dpp->tf_shift->CM_GAMUT_REMAP_C11;
+	gam_regs.masks.csc_c11  = dpp->tf_mask->CM_GAMUT_REMAP_C11;
+	gam_regs.shifts.csc_c12 = dpp->tf_shift->CM_GAMUT_REMAP_C12;
+	gam_regs.masks.csc_c12 = dpp->tf_mask->CM_GAMUT_REMAP_C12;
+
+	if (*select == GAMUT_REMAP_COEFF) {
+
+		gam_regs.csc_c11_c12 = REG(CM_GAMUT_REMAP_C11_C12);
+		gam_regs.csc_c33_c34 = REG(CM_GAMUT_REMAP_C33_C34);
+
+		cm_helper_read_color_matrices(
+				dpp->base.ctx,
+				regval,
+				&gam_regs);
+
+	} else if (*select == GAMUT_REMAP_COMA_COEFF) {
+
+		gam_regs.csc_c11_c12 = REG(CM_COMA_C11_C12);
+		gam_regs.csc_c33_c34 = REG(CM_COMA_C33_C34);
+
+		cm_helper_read_color_matrices(
+				dpp->base.ctx,
+				regval,
+				&gam_regs);
+
+	} else if (*select == GAMUT_REMAP_COMB_COEFF) {
+
+		gam_regs.csc_c11_c12 = REG(CM_COMB_C11_C12);
+		gam_regs.csc_c33_c34 = REG(CM_COMB_C33_C34);
+
+		cm_helper_read_color_matrices(
+				dpp->base.ctx,
+				regval,
+				&gam_regs);
+	}
+}
+
+void dpp1_cm_get_gamut_remap(struct dpp *dpp_base,
+			     struct dpp_grph_csc_adjustment *adjust)
+{
+	struct dcn10_dpp *dpp = TO_DCN10_DPP(dpp_base);
+	uint16_t arr_reg_val[12];
+	enum gamut_remap_select select;
+
+	read_gamut_remap(dpp, arr_reg_val, &select);
+
+	if (select == GAMUT_REMAP_BYPASS) {
+		adjust->gamut_adjust_type = GRAPHICS_GAMUT_ADJUST_TYPE_BYPASS;
+		return;
+	}
+
+	adjust->gamut_adjust_type = GRAPHICS_GAMUT_ADJUST_TYPE_SW;
+	convert_hw_matrix(adjust->temperature_matrix,
+			  arr_reg_val, ARRAY_SIZE(arr_reg_val));
+}
+
 static void dpp1_cm_program_color_matrix(
 		struct dcn10_dpp *dpp,
 		const uint16_t *regval)

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp.c

@@ -393,6 +393,7 @@ static struct dpp_funcs dcn20_dpp_funcs = {
 	.set_optional_cursor_attributes = dpp1_cnv_set_optional_cursor_attributes,
 	.dpp_dppclk_control = dpp1_dppclk_control,
 	.dpp_set_hdr_multiplier = dpp2_set_hdr_multiplier,
+	.dpp_get_gamut_remap = dpp2_cm_get_gamut_remap,
 };
 
 static struct dpp_caps dcn20_dpp_cap = {

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp.h

@@ -775,4 +775,7 @@ bool dpp2_construct(struct dcn20_dpp *dpp2,
 void dpp2_power_on_obuf(
 		struct dpp *dpp_base,
 	bool power_on);
+
+void dpp2_cm_get_gamut_remap(struct dpp *dpp_base,
+			     struct dpp_grph_csc_adjustment *adjust);
 #endif /* __DC_HWSS_DCN20_H__ */

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp_cm.c

@@ -234,6 +234,61 @@ void dpp2_cm_set_gamut_remap(
 	}
 }
 
+static void read_gamut_remap(struct dcn20_dpp *dpp,
+			     uint16_t *regval,
+			     enum dcn20_gamut_remap_select *select)
+{
+	struct color_matrices_reg gam_regs;
+	uint32_t selection;
+
+	IX_REG_GET(CM_TEST_DEBUG_INDEX, CM_TEST_DEBUG_DATA,
+		   CM_TEST_DEBUG_DATA_STATUS_IDX,
+		   CM_TEST_DEBUG_DATA_GAMUT_REMAP_MODE, &selection);
+
+	*select = selection;
+
+	gam_regs.shifts.csc_c11 = dpp->tf_shift->CM_GAMUT_REMAP_C11;
+	gam_regs.masks.csc_c11  = dpp->tf_mask->CM_GAMUT_REMAP_C11;
+	gam_regs.shifts.csc_c12 = dpp->tf_shift->CM_GAMUT_REMAP_C12;
+	gam_regs.masks.csc_c12 = dpp->tf_mask->CM_GAMUT_REMAP_C12;
+
+	if (*select == DCN2_GAMUT_REMAP_COEF_A) {
+		gam_regs.csc_c11_c12 = REG(CM_GAMUT_REMAP_C11_C12);
+		gam_regs.csc_c33_c34 = REG(CM_GAMUT_REMAP_C33_C34);
+
+		cm_helper_read_color_matrices(dpp->base.ctx,
+					      regval,
+					      &gam_regs);
+
+	} else if (*select == DCN2_GAMUT_REMAP_COEF_B) {
+		gam_regs.csc_c11_c12 = REG(CM_GAMUT_REMAP_B_C11_C12);
+		gam_regs.csc_c33_c34 = REG(CM_GAMUT_REMAP_B_C33_C34);
+
+		cm_helper_read_color_matrices(dpp->base.ctx,
+					      regval,
+					      &gam_regs);
+	}
+}
+
+void dpp2_cm_get_gamut_remap(struct dpp *dpp_base,
+			     struct dpp_grph_csc_adjustment *adjust)
+{
+	struct dcn20_dpp *dpp = TO_DCN20_DPP(dpp_base);
+	uint16_t arr_reg_val[12];
+	enum dcn20_gamut_remap_select select;
+
+	read_gamut_remap(dpp, arr_reg_val, &select);
+
+	if (select == DCN2_GAMUT_REMAP_BYPASS) {
+		adjust->gamut_adjust_type = GRAPHICS_GAMUT_ADJUST_TYPE_BYPASS;
+		return;
+	}
+
+	adjust->gamut_adjust_type = GRAPHICS_GAMUT_ADJUST_TYPE_SW;
+	convert_hw_matrix(adjust->temperature_matrix,
+			  arr_reg_val, ARRAY_SIZE(arr_reg_val));
+}
+
 void dpp2_program_input_csc(
 		struct dpp *dpp_base,
 		enum dc_color_space color_space,

drivers/gpu/drm/amd/display/dc/dcn201/dcn201_dpp.c

@@ -275,6 +275,7 @@ static struct dpp_funcs dcn201_dpp_funcs = {
 	.set_optional_cursor_attributes = dpp1_cnv_set_optional_cursor_attributes,
 	.dpp_dppclk_control = dpp1_dppclk_control,
 	.dpp_set_hdr_multiplier = dpp2_set_hdr_multiplier,
+	.dpp_get_gamut_remap = dpp2_cm_get_gamut_remap,
 };
 
 static struct dpp_caps dcn201_dpp_cap = {

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp.c

@@ -1462,6 +1462,7 @@ static struct dpp_funcs dcn30_dpp_funcs = {
 	.set_optional_cursor_attributes	= dpp1_cnv_set_optional_cursor_attributes,
 	.dpp_dppclk_control		= dpp1_dppclk_control,
 	.dpp_set_hdr_multiplier		= dpp3_set_hdr_multiplier,
+	.dpp_get_gamut_remap		= dpp3_cm_get_gamut_remap,
 };
 
 

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp.h

@@ -637,4 +637,6 @@ void dpp3_program_cm_dealpha(
 		struct dpp *dpp_base,
 	uint32_t enable, uint32_t additive_blending);
 
+void dpp3_cm_get_gamut_remap(struct dpp *dpp_base,
+			     struct dpp_grph_csc_adjustment *adjust);
 #endif /* __DC_HWSS_DCN30_H__ */

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp_cm.c

@@ -408,3 +408,57 @@ void dpp3_cm_set_gamut_remap(
 		program_gamut_remap(dpp, arr_reg_val, gamut_mode);
 	}
 }
+
+static void read_gamut_remap(struct dcn3_dpp *dpp,
+			     uint16_t *regval,
+			     int *select)
+{
+	struct color_matrices_reg gam_regs;
+	uint32_t selection;
+
+	//current coefficient set in use
+	REG_GET(CM_GAMUT_REMAP_CONTROL, CM_GAMUT_REMAP_MODE_CURRENT, &selection);
+
+	*select = selection;
+
+	gam_regs.shifts.csc_c11 = dpp->tf_shift->CM_GAMUT_REMAP_C11;
+	gam_regs.masks.csc_c11  = dpp->tf_mask->CM_GAMUT_REMAP_C11;
+	gam_regs.shifts.csc_c12 = dpp->tf_shift->CM_GAMUT_REMAP_C12;
+	gam_regs.masks.csc_c12 = dpp->tf_mask->CM_GAMUT_REMAP_C12;
+
+	if (*select == GAMUT_REMAP_COEFF) {
+		gam_regs.csc_c11_c12 = REG(CM_GAMUT_REMAP_C11_C12);
+		gam_regs.csc_c33_c34 = REG(CM_GAMUT_REMAP_C33_C34);
+
+		cm_helper_read_color_matrices(dpp->base.ctx,
+					      regval,
+					      &gam_regs);
+
+	} else if (*select == GAMUT_REMAP_COMA_COEFF) {
+		gam_regs.csc_c11_c12 = REG(CM_GAMUT_REMAP_B_C11_C12);
+		gam_regs.csc_c33_c34 = REG(CM_GAMUT_REMAP_B_C33_C34);
+
+		cm_helper_read_color_matrices(dpp->base.ctx,
+					      regval,
+					      &gam_regs);
+	}
+}
+
+void dpp3_cm_get_gamut_remap(struct dpp *dpp_base,
+			     struct dpp_grph_csc_adjustment *adjust)
+{
+	struct dcn3_dpp *dpp = TO_DCN30_DPP(dpp_base);
+	uint16_t arr_reg_val[12];
+	int select;
+
+	read_gamut_remap(dpp, arr_reg_val, &select);
+
+	if (select == GAMUT_REMAP_BYPASS) {
+		adjust->gamut_adjust_type = GRAPHICS_GAMUT_ADJUST_TYPE_BYPASS;
+		return;
+	}
+
+	adjust->gamut_adjust_type = GRAPHICS_GAMUT_ADJUST_TYPE_SW;
+	convert_hw_matrix(adjust->temperature_matrix,
+			  arr_reg_val, ARRAY_SIZE(arr_reg_val));
+}

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dpp.c

@@ -133,6 +133,7 @@ static struct dpp_funcs dcn32_dpp_funcs = {
 	.set_optional_cursor_attributes	= dpp1_cnv_set_optional_cursor_attributes,
 	.dpp_dppclk_control			= dpp1_dppclk_control,
 	.dpp_set_hdr_multiplier		= dpp3_set_hdr_multiplier,
+	.dpp_get_gamut_remap		= dpp3_cm_get_gamut_remap,
 };
 
 

drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h

@@ -290,6 +290,9 @@ struct dpp_funcs {
 	void (*dpp_cnv_set_alpha_keyer)(
 			struct dpp *dpp_base,
 			struct cnv_color_keyer_params *color_keyer);
+
+	void (*dpp_get_gamut_remap)(struct dpp *dpp_base,
+				    struct dpp_grph_csc_adjustment *adjust);
 };