drm/amd/display: DIO Supported for virtual displays

[WHY]
Virtual displays do not use the backend of the pipe, and so have
infinite backend bandwidth.

[HOW]
Add a skip_dio_check bool to the VBA struct, which is used to override
the DIOSupport calculations.

Signed-off-by: Wesley Chalmers <[e-mail]>
Reviewed-by: Jun Lei <[e-mail]>
Acked-by: Anson Jacob <[e-mail]>
Acked-by: Chris Park <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 			pipes[pipe_cnt].pipe.dest.pixel_rate_mhz *= 2;
 		pipes[pipe_cnt].pipe.dest.otg_inst = res_ctx->pipe_ctx[i].stream_res.tg->inst;
 		pipes[pipe_cnt].dout.dp_lanes = 4;
+		pipes[pipe_cnt].dout.is_virtual = 0;
 		pipes[pipe_cnt].pipe.dest.vtotal_min = res_ctx->pipe_ctx[i].stream->adjust.v_total_min;
 		pipes[pipe_cnt].pipe.dest.vtotal_max = res_ctx->pipe_ctx[i].stream->adjust.v_total_max;
 		switch (get_num_odm_splits(&res_ctx->pipe_ctx[i])) {
···
 			break;
 		default:
 			/* In case there is no signal, set dp with 4 lanes to allow max config */
+			pipes[pipe_cnt].dout.is_virtual = 1;
 			pipes[pipe_cnt].dout.output_type = dm_dp;
 			pipes[pipe_cnt].dout.dp_lanes = 4;
 		}

drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c

···
 	for (i = 0; i <= mode_lib->vba.soc.num_states; i++) {
 		locals->DIOSupport[i] = true;
 		for (k = 0; k <= mode_lib->vba.NumberOfActivePlanes - 1; k++) {
-			if (locals->OutputBppPerState[i][k] == BPP_INVALID
-					|| (mode_lib->vba.OutputFormat[k] == dm_420
+			if (!mode_lib->vba.skip_dio_check[k]
+					&& (locals->OutputBppPerState[i][k] == BPP_INVALID
+						|| (mode_lib->vba.OutputFormat[k] == dm_420
 							&& mode_lib->vba.Interlace[k] == true
-							&& mode_lib->vba.ProgressiveToInterlaceUnitInOPP == true)) {
+							&& mode_lib->vba.ProgressiveToInterlaceUnitInOPP == true))) {
 				locals->DIOSupport[i] = false;
 			}
 		}

drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20v2.c

···
 	for (i = 0; i <= mode_lib->vba.soc.num_states; i++) {
 		locals->DIOSupport[i] = true;
 		for (k = 0; k <= mode_lib->vba.NumberOfActivePlanes - 1; k++) {
-			if (locals->OutputBppPerState[i][k] == BPP_INVALID
-					|| (mode_lib->vba.OutputFormat[k] == dm_420
+			if (!mode_lib->vba.skip_dio_check[k]
+					&& (locals->OutputBppPerState[i][k] == BPP_INVALID
+						|| (mode_lib->vba.OutputFormat[k] == dm_420
 							&& mode_lib->vba.Interlace[k] == true
-							&& mode_lib->vba.ProgressiveToInterlaceUnitInOPP == true)) {
+							&& mode_lib->vba.ProgressiveToInterlaceUnitInOPP == true))) {
 				locals->DIOSupport[i] = false;
 			}
 		}

drivers/gpu/drm/amd/display/dc/dml/dcn21/display_mode_vba_21.c

···
 	for (i = 0; i <= mode_lib->vba.soc.num_states; i++) {
 		locals->DIOSupport[i] = true;
 		for (k = 0; k <= mode_lib->vba.NumberOfActivePlanes - 1; k++) {
-			if (locals->OutputBppPerState[i][k] == BPP_INVALID
-					|| (mode_lib->vba.OutputFormat[k] == dm_420
+			if (!mode_lib->vba.skip_dio_check[k]
+					&& (locals->OutputBppPerState[i][k] == BPP_INVALID
+						|| (mode_lib->vba.OutputFormat[k] == dm_420
 							&& mode_lib->vba.Interlace[k] == true
-							&& mode_lib->vba.ProgressiveToInterlaceUnitInOPP == true)) {
+							&& mode_lib->vba.ProgressiveToInterlaceUnitInOPP == true))) {
 				locals->DIOSupport[i] = false;
 			}
 		}

drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c

···
 	for (i = 0; i < v->soc.num_states; i++) {
 		v->DIOSupport[i] = true;
 		for (k = 0; k <= v->NumberOfActivePlanes - 1; k++) {
-			if (v->BlendingAndTiming[k] == k && (v->Output[k] == dm_dp || v->Output[k] == dm_edp || v->Output[k] == dm_hdmi)
+			if (!v->skip_dio_check[k] && v->BlendingAndTiming[k] == k && (v->Output[k] == dm_dp || v->Output[k] == dm_edp || v->Output[k] == dm_hdmi)
 					&& (v->OutputBppPerState[i][k] == 0
 							|| (v->OutputFormat[k] == dm_420 && v->Interlace[k] == true && v->ProgressiveToInterlaceUnitInOPP == true))) {
 				v->DIOSupport[i] = false;

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

···
 	int num_active_wb;
 	int output_bpc;
 	int output_type;
+	int is_virtual;
 	int output_format;
 	int dsc_slices;
 	int max_audio_sample_rate;

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

···
 				dout->output_bpp;
 		mode_lib->vba.Output[mode_lib->vba.NumberOfActivePlanes] =
 				(enum output_encoder_class) (dout->output_type);
+		mode_lib->vba.skip_dio_check[mode_lib->vba.NumberOfActivePlanes] =
+				dout->is_virtual;
 
 		if (!dout->dsc_enable)
 			mode_lib->vba.ForcedOutputLinkBPP[mode_lib->vba.NumberOfActivePlanes] = dout->output_bpp;

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

···
 	unsigned int DSCInputBitPerComponent[DC__NUM_DPP__MAX];
 	enum output_format_class OutputFormat[DC__NUM_DPP__MAX];
 	enum output_encoder_class Output[DC__NUM_DPP__MAX];
+	bool skip_dio_check[DC__NUM_DPP__MAX];
 	unsigned int BlendingAndTiming[DC__NUM_DPP__MAX];
 	bool SynchronizedVBlank;
 	unsigned int NumberOfCursors[DC__NUM_DPP__MAX];