drm/amd/display: Add output bitrate to DML calculations

[why]
Output bitrate was mistakenly left out, causing corruption on some
DSC low resolution (such as 800x600) modes.
Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

@@ -1894,7 +1894,7 @@ int dcn20_populate_dml_pipes_from_context(
 			break;
 		case PIXEL_ENCODING_YCBCR420:
 			pipes[pipe_cnt].dout.output_format = dm_420;
-			pipes[pipe_cnt].dout.output_bpp = (output_bpc * 3) / 2;
+			pipes[pipe_cnt].dout.output_bpp = (output_bpc * 3.0) / 2;
 			break;
 		case PIXEL_ENCODING_YCBCR422:
 			if (true) /* todo */
@@ -1908,6 +1908,9 @@ int dcn20_populate_dml_pipes_from_context(
 			pipes[pipe_cnt].dout.output_bpp = output_bpc * 3;
 		}
 
+		if (res_ctx->pipe_ctx[i].stream->timing.flags.DSC)
+			pipes[pipe_cnt].dout.output_bpp = res_ctx->pipe_ctx[i].stream->timing.dsc_cfg.bits_per_pixel / 16.0;
+
 		/* todo: default max for now, until there is logic reflecting this in dc*/
 		pipes[pipe_cnt].dout.output_bpc = 12;
 		/*

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

@@ -269,7 +269,7 @@ struct writeback_st {
 
 struct _vcs_dpi_display_output_params_st {
 	int dp_lanes;
-	int output_bpp;
+	double output_bpp;
 	int dsc_enable;
 	int wb_enable;
 	int num_active_wb;

drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c

@@ -434,6 +434,8 @@ static void fetch_pipe_params(struct display_mode_lib *mode_lib)
 				dst->odm_combine;
 		mode_lib->vba.OutputFormat[mode_lib->vba.NumberOfActivePlanes] =
 				(enum output_format_class) (dout->output_format);
+		mode_lib->vba.OutputBpp[mode_lib->vba.NumberOfActivePlanes] =
+				dout->output_bpp;
 		mode_lib->vba.Output[mode_lib->vba.NumberOfActivePlanes] =
 				(enum output_encoder_class) (dout->output_type);