drm/amd/display: Update FMT settings for 4:2:0

[Why] Update FMT_CONTROL settings based on HW spec
[How] Update FMT settings for 4:2:0
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Eric Bernstein <eric.bernstein@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@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/dcn10/dcn10_opp.c

@@ -168,6 +168,10 @@ static void opp1_set_pixel_encoding(
 
 	case PIXEL_ENCODING_RGB:
 	case PIXEL_ENCODING_YCBCR444:
+		REG_UPDATE_3(FMT_CONTROL,
+				FMT_PIXEL_ENCODING, 0,
+				FMT_SUBSAMPLING_MODE, 0,
+				FMT_CBCR_BIT_REDUCTION_BYPASS, 0);
 		REG_UPDATE(FMT_CONTROL, FMT_PIXEL_ENCODING, 0);
 		break;
 	case PIXEL_ENCODING_YCBCR422:
@@ -177,7 +181,10 @@ static void opp1_set_pixel_encoding(
 				FMT_CBCR_BIT_REDUCTION_BYPASS, 0);
 		break;
 	case PIXEL_ENCODING_YCBCR420:
-		REG_UPDATE(FMT_CONTROL, FMT_PIXEL_ENCODING, 2);
+		REG_UPDATE_3(FMT_CONTROL,
+				FMT_PIXEL_ENCODING, 2,
+				FMT_SUBSAMPLING_MODE, 2,
+				FMT_CBCR_BIT_REDUCTION_BYPASS, 1);
 		break;
 	default:
 		break;

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.h

@@ -79,6 +79,8 @@
 	OPP_SF(FMT0_FMT_CONTROL, FMT_SPATIAL_DITHER_FRAME_COUNTER_MAX, mask_sh), \
 	OPP_SF(FMT0_FMT_CONTROL, FMT_SPATIAL_DITHER_FRAME_COUNTER_BIT_SWAP, mask_sh), \
 	OPP_SF(FMT0_FMT_CONTROL, FMT_PIXEL_ENCODING, mask_sh), \
+	OPP_SF(FMT0_FMT_CONTROL, FMT_SUBSAMPLING_MODE, mask_sh), \
+	OPP_SF(FMT0_FMT_CONTROL, FMT_CBCR_BIT_REDUCTION_BYPASS, mask_sh), \
 	OPP_SF(FMT0_FMT_CONTROL, FMT_STEREOSYNC_OVERRIDE, mask_sh), \
 	OPP_SF(FMT0_FMT_DITHER_RAND_R_SEED, FMT_RAND_R_SEED, mask_sh), \
 	OPP_SF(FMT0_FMT_DITHER_RAND_G_SEED, FMT_RAND_G_SEED, mask_sh), \