drm/amd/display: Implement bias and scale pre scl

why:
New scaler needs the input to be full range color space. This will also fix
issues that come up due to not having a predefined limited color space matrix
for certain color spaces

how:
Use bias and scale HW to expand the range of limited color spaces to full
before the scaler
Reviewed-by: Krunoslav Kovac <krunoslav.kovac@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Relja Vojvodic <relja.vojvodic@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -901,12 +901,12 @@ void hwss_program_bias_and_scale(union block_sequence_params *params)
 	struct pipe_ctx *pipe_ctx = params->program_bias_and_scale_params.pipe_ctx;
 	struct dpp *dpp = pipe_ctx->plane_res.dpp;
 	struct dc_plane_state *plane_state = pipe_ctx->plane_state;
-	struct dc_bias_and_scale bns_params = {0};
+	struct dc_bias_and_scale bns_params = plane_state->bias_and_scale;
 
 	//TODO :for CNVC set scale and bias registers if necessary
-	build_prescale_params(&bns_params, plane_state);
-	if (dpp->funcs->dpp_program_bias_and_scale)
+	if (dpp->funcs->dpp_program_bias_and_scale) {
 		dpp->funcs->dpp_program_bias_and_scale(dpp, &bns_params);
+	}
 }
 
 void hwss_power_on_mpc_mem_pwr(union block_sequence_params *params)

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

@@ -1292,7 +1292,7 @@ struct dc_plane_state {
 
 	struct dc_gamma gamma_correction;
 	struct dc_transfer_func in_transfer_func;
-	struct dc_bias_and_scale *bias_and_scale;
+	struct dc_bias_and_scale bias_and_scale;
 	struct dc_csc_transform input_csc_color_matrix;
 	struct fixed31_32 coeff_reduction_factor;
 	struct fixed31_32 hdr_mult;

drivers/gpu/drm/amd/display/dc/dpp/dcn35/dcn35_dpp.c

@@ -59,6 +59,31 @@ void dpp35_dppclk_control(
 				DISPCLK_R_GATE_DISABLE, 0);
 }
 
+void dpp35_program_bias_and_scale_fcnv(
+	struct dpp *dpp_base,
+	struct dc_bias_and_scale *params)
+{
+	struct dcn20_dpp *dpp = TO_DCN20_DPP(dpp_base);
+
+	if (!params->bias_and_scale_valid) {
+		REG_SET(FCNV_FP_BIAS_R, 0, FCNV_FP_BIAS_R, 0);
+		REG_SET(FCNV_FP_BIAS_G, 0, FCNV_FP_BIAS_G, 0);
+		REG_SET(FCNV_FP_BIAS_B, 0, FCNV_FP_BIAS_B, 0);
+
+		REG_SET(FCNV_FP_SCALE_R, 0, FCNV_FP_SCALE_R, 0x1F000);
+		REG_SET(FCNV_FP_SCALE_G, 0, FCNV_FP_SCALE_G, 0x1F000);
+		REG_SET(FCNV_FP_SCALE_B, 0, FCNV_FP_SCALE_B, 0x1F000);
+	} else {
+		REG_SET(FCNV_FP_BIAS_R, 0, FCNV_FP_BIAS_R, params->bias_red);
+		REG_SET(FCNV_FP_BIAS_G, 0, FCNV_FP_BIAS_G, params->bias_green);
+		REG_SET(FCNV_FP_BIAS_B, 0, FCNV_FP_BIAS_B, params->bias_blue);
+
+		REG_SET(FCNV_FP_SCALE_R, 0, FCNV_FP_SCALE_R, params->scale_red);
+		REG_SET(FCNV_FP_SCALE_G, 0, FCNV_FP_SCALE_G, params->scale_green);
+		REG_SET(FCNV_FP_SCALE_B, 0, FCNV_FP_SCALE_B, params->scale_blue);
+	}
+}
+
 static struct dpp_funcs dcn35_dpp_funcs = {
 	.dpp_program_gamcor_lut		= dpp3_program_gamcor_lut,
 	.dpp_read_state				= dpp30_read_state,
@@ -81,7 +106,7 @@ static struct dpp_funcs dcn35_dpp_funcs = {
 	.dpp_program_shaper_lut		= NULL, // CM SHAPER block is removed in DCN3.2 DPP, (it is in MPCC, programmable before or after BLND)
 	.dpp_program_3dlut			= NULL, // CM 3DLUT block is removed in DCN3.2 DPP, (it is in MPCC, programmable before or after BLND)
 
-	.dpp_program_bias_and_scale	= NULL,
+	.dpp_program_bias_and_scale	= dpp35_program_bias_and_scale_fcnv,
 	.dpp_cnv_set_alpha_keyer	= dpp2_cnv_set_alpha_keyer,
 	.set_cursor_attributes		= dpp3_set_cursor_attributes,
 	.set_cursor_position		= dpp1_set_cursor_position,

drivers/gpu/drm/amd/display/dc/dpp/dcn35/dcn35_dpp.h

@@ -61,4 +61,7 @@ bool dpp35_construct(struct dcn3_dpp *dpp3, struct dc_context *ctx,
 
 void dpp35_set_fgcg(struct dcn3_dpp *dpp, bool enable);
 
+void dpp35_program_bias_and_scale_fcnv(struct dpp *dpp_base,
+		struct dc_bias_and_scale *bias_and_scale);
+
 #endif // __DCN35_DPP_H

drivers/gpu/drm/amd/display/dc/dpp/dcn401/dcn401_dpp.c

@@ -30,6 +30,7 @@
 #include "basics/conversion.h"
 #include "dcn30/dcn30_cm_common.h"
 #include "dcn32/dcn32_dpp.h"
+#include "dcn35/dcn35_dpp.h"
 
 #define REG(reg)\
 	dpp->tf_regs->reg
@@ -240,7 +241,7 @@ static struct dpp_funcs dcn401_dpp_funcs = {
 	.dpp_program_shaper_lut		= NULL, // CM SHAPER block is removed in DCN3.2 DPP, (it is in MPCC, programmable before or after BLND)
 	.dpp_program_3dlut			= NULL, // CM 3DLUT block is removed in DCN3.2 DPP, (it is in MPCC, programmable before or after BLND)
 
-	.dpp_program_bias_and_scale	= NULL,
+	.dpp_program_bias_and_scale	= dpp35_program_bias_and_scale_fcnv,
 	.dpp_cnv_set_alpha_keyer	= dpp2_cnv_set_alpha_keyer,
 	.set_cursor_attributes		= dpp401_set_cursor_attributes,
 	.set_cursor_position		= dpp401_set_cursor_position,

drivers/gpu/drm/amd/display/dc/hwss/dcn20/dcn20_hwseq.c

@@ -1698,7 +1698,7 @@ static void dcn20_update_dchubp_dpp(
 			plane_state->update_flags.bits.input_csc_change ||
 			plane_state->update_flags.bits.color_space_change ||
 			plane_state->update_flags.bits.coeff_reduction_change) {
-		struct dc_bias_and_scale bns_params = {0};
+		struct dc_bias_and_scale bns_params = plane_state->bias_and_scale;
 
 		// program the input csc
 		dpp->funcs->dpp_setup(dpp,
@@ -1715,7 +1715,6 @@ static void dcn20_update_dchubp_dpp(
 		}
 		if (dpp->funcs->dpp_program_bias_and_scale) {
 			//TODO :for CNVC set scale and bias registers if necessary
-			build_prescale_params(&bns_params, plane_state);
 			dpp->funcs->dpp_program_bias_and_scale(dpp, &bns_params);
 		}
 	}

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

@@ -217,12 +217,13 @@ enum optc_dsc_mode {
 };
 
 struct dc_bias_and_scale {
-	uint16_t scale_red;
-	uint16_t bias_red;
-	uint16_t scale_green;
-	uint16_t bias_green;
-	uint16_t scale_blue;
-	uint16_t bias_blue;
+	uint32_t scale_red;
+	uint32_t bias_red;
+	uint32_t scale_green;
+	uint32_t bias_green;
+	uint32_t scale_blue;
+	uint32_t bias_blue;
+	bool bias_and_scale_valid;
 };
 
 enum test_pattern_dyn_range {