drm/amd/display: Use SDR white level to calculate matrix coefficients

[WHY]
Certain profiles have higher HDR multiplier than SDR white level max
which is not currently supported.

[HOW]
Use SDR white level when calculating matrix coefficients for HDR RGB MPO
path instead of HDR multiplier.

Cc: Mario Limonciello <[e-mail]>
Cc: Alex Deucher <[e-mail]>
Cc: [e-mail]
Reviewed-by: Jun Lei <[e-mail]>
Signed-off-by: Samson Tam <[e-mail]>
Signed-off-by: Alex Hung <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/core/dc.c

···
 			elevate_update_type(&overall_type, UPDATE_TYPE_MED);
 		}
 
+	if (u->sdr_white_level_nits)
+		if (u->sdr_white_level_nits != u->surface->sdr_white_level_nits) {
+			update_flags->bits.sdr_white_level_nits = 1;
+			elevate_update_type(&overall_type, UPDATE_TYPE_FULL);
+		}
+
 	if (u->cm2_params) {
 		if ((u->cm2_params->component_settings.shaper_3dlut_setting
 					!= u->surface->mcm_shaper_3dlut_setting)
···
 	if (srf_update->hdr_mult.value)
 		surface->hdr_mult =
 				srf_update->hdr_mult;
+
+	if (srf_update->sdr_white_level_nits)
+		surface->sdr_white_level_nits =
+				srf_update->sdr_white_level_nits;
 
 	if (srf_update->blend_tf)
 		memcpy(&surface->blend_tf, srf_update->blend_tf,
···
 				srf_updates[i].scaling_info ||
 				(srf_updates[i].hdr_mult.value &&
 				srf_updates[i].hdr_mult.value != srf_updates->surface->hdr_mult.value) ||
+				(srf_updates[i].sdr_white_level_nits &&
+				srf_updates[i].sdr_white_level_nits != srf_updates->surface->sdr_white_level_nits) ||
 				srf_updates[i].in_transfer_func ||
 				srf_updates[i].func_shaper ||
 				srf_updates[i].lut3d_func ||

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

···
 		uint32_t tmz_changed:1;
 		uint32_t mcm_transfer_function_enable_change:1; /* disable or enable MCM transfer func */
 		uint32_t full_update:1;
+		uint32_t sdr_white_level_nits:1;
 	} bits;
 
 	uint32_t raw;
···
 	bool adaptive_sharpness_en;
 	int sharpness_level;
 	enum linear_light_scaling linear_light_scaling;
+	unsigned int sdr_white_level_nits;
 };
 
 struct dc_plane_info {
···
 	 */
 	struct dc_cm2_parameters *cm2_params;
 	const struct dc_csc_transform *cursor_csc_color_matrix;
+	unsigned int sdr_white_level_nits;
 };
 
 /*

drivers/gpu/drm/amd/display/dc/dc_spl_translate.c

···
 	 */
 	spl_in->is_fullscreen = dm_helpers_is_fullscreen(pipe_ctx->stream->ctx, pipe_ctx->stream);
 	spl_in->is_hdr_on = dm_helpers_is_hdr_on(pipe_ctx->stream->ctx, pipe_ctx->stream);
-	spl_in->hdr_multx100 = 0;
-	if (spl_in->is_hdr_on) {
-		spl_in->hdr_multx100 = (uint32_t)dc_fixpt_floor(dc_fixpt_mul(plane_state->hdr_mult,
-			dc_fixpt_from_int(100)));
-		/* Disable sharpness for HDR Mult > 6.0 */
-		if (spl_in->hdr_multx100 > 600)
-			spl_in->adaptive_sharpness.enable = false;
-	}
+	spl_in->sdr_white_level_nits = plane_state->sdr_white_level_nits;
 }
 
 /// @brief Translate SPL output parameters to pipe context

drivers/gpu/drm/amd/display/dc/spl/dc_spl.c

···
 }
 
 /* Calculate C0-C3 coefficients based on HDR_mult */
-static void spl_calculate_c0_c3_hdr(struct dscl_prog_data *dscl_prog_data, uint32_t hdr_multx100)
+static void spl_calculate_c0_c3_hdr(struct dscl_prog_data *dscl_prog_data, uint32_t sdr_white_level_nits)
 {
 	struct spl_fixed31_32 hdr_mult, c0_mult, c1_mult, c2_mult;
 	struct spl_fixed31_32 c0_calc, c1_calc, c2_calc;
 	struct spl_custom_float_format fmt;
+	uint32_t hdr_multx100_int;
 
-	SPL_ASSERT(hdr_multx100);
-	hdr_mult = spl_fixpt_from_fraction((long long)hdr_multx100, 100LL);
+	if ((sdr_white_level_nits >= 80) && (sdr_white_level_nits <= 480))
+		hdr_multx100_int = sdr_white_level_nits * 100 / 80;
+	else
+		hdr_multx100_int = 100; /* default for 80 nits otherwise */
+
+	hdr_mult = spl_fixpt_from_fraction((long long)hdr_multx100_int, 100LL);
 	c0_mult = spl_fixpt_from_fraction(2126LL, 10000LL);
 	c1_mult = spl_fixpt_from_fraction(7152LL, 10000LL);
 	c2_mult = spl_fixpt_from_fraction(722LL, 10000LL);
···
 static void spl_set_easf_data(struct spl_scratch *spl_scratch, struct spl_out *spl_out, bool enable_easf_v,
 	bool enable_easf_h, enum linear_light_scaling lls_pref,
 	enum spl_pixel_format format, enum system_setup setup,
-	uint32_t hdr_multx100)
+	uint32_t sdr_white_level_nits)
 {
 	struct dscl_prog_data *dscl_prog_data = spl_out->dscl_prog_data;
 	if (enable_easf_v) {
···
 		dscl_prog_data->easf_ltonl_en = 1;	// Linear input
 		if ((setup == HDR_L) && (spl_is_rgb8(format))) {
 			/* Calculate C0-C3 coefficients based on HDR multiplier */
-			spl_calculate_c0_c3_hdr(dscl_prog_data, hdr_multx100);
+			spl_calculate_c0_c3_hdr(dscl_prog_data, sdr_white_level_nits);
 		} else { // HDR_L ( DWM ) and SDR_L
 			dscl_prog_data->easf_matrix_c0 =
 				0x4EF7;	// fp1.5.10, C0 coefficient (LN_rec709:  0.2126 * (2^14)/125 = 27.86590720)
···
 
 	// Set EASF
 	spl_set_easf_data(&spl_scratch, spl_out, enable_easf_v, enable_easf_h, spl_in->lls_pref,
-		spl_in->basic_in.format, setup, spl_in->hdr_multx100);
+		spl_in->basic_in.format, setup, spl_in->sdr_white_level_nits);
 
 	// Set iSHARP
 	vratio = spl_fixpt_ceil(spl_scratch.scl_data.ratios.vert);

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

···
 	bool is_hdr_on;
 	int h_active;
 	int v_active;
-	int hdr_multx100;
+	int sdr_white_level_nits;
 };
 // end of SPL inputs