drm/amd/display: turn on symclk for dio virtual stream in dpms sequence

[why]
In order to support glitchless display clock ramping for virtual stream,
we must
turn on symclk for stream encoder. The code will power on phy and enable
symclk
for dio encoder during virtual stream dpms sequence.
Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@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_resource.c

@@ -3648,8 +3648,10 @@ enum dc_status resource_map_pool_resources(
 	/* Allocate DP HPO Stream Encoder based on signal, hw capabilities
 	 * and link settings
 	 */
-	if (dc_is_dp_signal(stream->signal)) {
-		if (!dc->link_srv->dp_decide_link_settings(stream, &pipe_ctx->link_config.dp_link_settings))
+	if (dc_is_dp_signal(stream->signal) ||
+			dc_is_virtual_signal(stream->signal)) {
+		if (!dc->link_srv->dp_decide_link_settings(stream,
+				&pipe_ctx->link_config.dp_link_settings))
 			return DC_FAIL_DP_LINK_BANDWIDTH;
 		if (dc->link_srv->dp_get_encoding_format(
 				&pipe_ctx->link_config.dp_link_settings) == DP_128b_132b_ENCODING) {

drivers/gpu/drm/amd/display/dc/dcn35/dcn35_dio_stream_encoder.c

@@ -254,6 +254,7 @@ static void enc35_stream_encoder_enable(
 			break;
 		case SIGNAL_TYPE_EDP:
 		case SIGNAL_TYPE_DISPLAY_PORT:
+		case SIGNAL_TYPE_VIRTUAL:
 			/* DP SST */
 			REG_UPDATE(DIG_FE_CLK_CNTL, DIG_FE_MODE, 0);
 			break;
@@ -459,7 +460,7 @@ static const struct stream_encoder_funcs dcn35_str_enc_funcs = {
 	.dp_set_dsc_pps_info_packet = enc3_dp_set_dsc_pps_info_packet,
 	.set_dynamic_metadata = enc2_set_dynamic_metadata,
 	.hdmi_reset_stream_attribute = enc1_reset_hdmi_stream_attribute,
-	.dig_stream_enable = enc35_stream_encoder_enable,
+	.enable_stream = enc35_stream_encoder_enable,
 
 	.set_input_mode = enc314_set_dig_input_mode,
 	.enable_fifo = enc35_enable_fifo,

drivers/gpu/drm/amd/display/dc/dcn401/dcn401_dio_stream_encoder.c

@@ -416,6 +416,7 @@ static void enc401_stream_encoder_enable(
 			break;
 		case SIGNAL_TYPE_EDP:
 		case SIGNAL_TYPE_DISPLAY_PORT:
+		case SIGNAL_TYPE_VIRTUAL:
 			/* DP SST */
 			REG_UPDATE(DIG_FE_CLK_CNTL, DIG_FE_MODE, 0);
 			break;
@@ -760,7 +761,7 @@ static const struct stream_encoder_funcs dcn401_str_enc_funcs = {
 	.dp_set_dsc_pps_info_packet = enc3_dp_set_dsc_pps_info_packet,
 	.set_dynamic_metadata = enc401_set_dynamic_metadata,
 	.hdmi_reset_stream_attribute = enc1_reset_hdmi_stream_attribute,
-	.dig_stream_enable = enc401_stream_encoder_enable,
+	.enable_stream = enc401_stream_encoder_enable,
 
 	.set_input_mode = enc401_set_dig_input_mode,
 	.enable_fifo = enc32_enable_fifo,

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

@@ -223,7 +223,7 @@ struct stream_encoder_funcs {
 		struct stream_encoder *enc,
 		int tg_inst);
 
-	void (*dig_stream_enable)(
+	void (*enable_stream)(
 		struct stream_encoder *enc,
 		enum signal_type signal,
 		bool enable);

drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_dio.c

@@ -46,6 +46,9 @@ void setup_dio_stream_encoder(struct pipe_ctx *pipe_ctx)
 	if (dc_is_dp_signal(pipe_ctx->stream->signal))
 		pipe_ctx->stream->ctx->dc->link_srv->dp_trace_source_sequence(pipe_ctx->stream->link,
 				DPCD_SOURCE_SEQ_AFTER_CONNECT_DIG_FE_BE);
+	if (stream_enc->funcs->enable_stream)
+		stream_enc->funcs->enable_stream(stream_enc,
+				pipe_ctx->stream->signal, true);
 	if (stream_enc->funcs->map_stream_to_link)
 		stream_enc->funcs->map_stream_to_link(stream_enc,
 				stream_enc->stream_enc_inst, link_enc->transmitter - TRANSMITTER_UNIPHY_A);
@@ -65,7 +68,9 @@ void reset_dio_stream_encoder(struct pipe_ctx *pipe_ctx)
 		stream_enc->funcs->disable_fifo(stream_enc);
 	if (stream_enc->funcs->set_input_mode)
 		stream_enc->funcs->set_input_mode(stream_enc, 0);
-
+	if (stream_enc->funcs->enable_stream)
+		stream_enc->funcs->enable_stream(stream_enc,
+				pipe_ctx->stream->signal, false);
 	link_enc->funcs->connect_dig_be_to_fe(
 			link_enc,
 			pipe_ctx->stream_res.stream_enc->id,

drivers/gpu/drm/amd/display/dc/link/link_dpms.c

@@ -1907,7 +1907,9 @@ static void disable_link(struct dc_link *link,
 {
 	if (dc_is_dp_signal(signal)) {
 		disable_link_dp(link, link_res, signal);
-	} else if (signal != SIGNAL_TYPE_VIRTUAL) {
+	} else if (signal == SIGNAL_TYPE_VIRTUAL) {
+		link->dc->hwss.disable_link_output(link, link_res, SIGNAL_TYPE_DISPLAY_PORT);
+	} else {
 		link->dc->hwss.disable_link_output(link, link_res, signal);
 	}
 
@@ -2154,6 +2156,18 @@ static enum dc_status enable_link_dp_mst(
 	return enable_link_dp(state, pipe_ctx);
 }
 
+static enum dc_status enable_link_virtual(struct pipe_ctx *pipe_ctx)
+{
+	struct dc_link *link = pipe_ctx->stream->link;
+
+	link->dc->hwss.enable_dp_link_output(link,
+			&pipe_ctx->link_res,
+			SIGNAL_TYPE_DISPLAY_PORT,
+			pipe_ctx->clock_source->id,
+			&pipe_ctx->link_config.dp_link_settings);
+	return DC_OK;
+}
+
 static enum dc_status enable_link(
 		struct dc_state *state,
 		struct pipe_ctx *pipe_ctx)
@@ -2193,7 +2207,7 @@ static enum dc_status enable_link(
 		status = DC_OK;
 		break;
 	case SIGNAL_TYPE_VIRTUAL:
-		status = DC_OK;
+		status = enable_link_virtual(pipe_ctx);
 		break;
 	default:
 		break;
@@ -2437,17 +2451,10 @@ void link_set_dpms_on(
 
 	if (!dc_is_virtual_signal(pipe_ctx->stream->signal)
 			&& !dp_is_128b_132b_signal(pipe_ctx)) {
-		struct stream_encoder *stream_enc = pipe_ctx->stream_res.stream_enc;
-
 		if (link_enc)
 			link_enc->funcs->setup(
 				link_enc,
 				pipe_ctx->stream->signal);
-
-		if (stream_enc && stream_enc->funcs->dig_stream_enable)
-			stream_enc->funcs->dig_stream_enable(
-				stream_enc,
-				pipe_ctx->stream->signal, 1);
 	}
 
 	pipe_ctx->stream->link->link_state_valid = true;
@@ -2547,18 +2554,12 @@ void link_set_dpms_on(
 	 */
 	if (!(dc_is_virtual_signal(pipe_ctx->stream->signal) ||
 			dp_is_128b_132b_signal(pipe_ctx))) {
-			struct stream_encoder *stream_enc = pipe_ctx->stream_res.stream_enc;
 
 			if (link_enc)
 				link_enc->funcs->setup(
 					link_enc,
 					pipe_ctx->stream->signal);
 
-			if (stream_enc && stream_enc->funcs->dig_stream_enable)
-				stream_enc->funcs->dig_stream_enable(
-					stream_enc,
-					pipe_ctx->stream->signal, 1);
-
 		}
 
 	dc->hwss.enable_stream(pipe_ctx);

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c

@@ -955,6 +955,9 @@ bool link_decide_link_settings(struct dc_stream_state *stream,
 		} else {
 			edp_decide_link_settings(link, link_setting, req_bw);
 		}
+	} else if (stream->signal == SIGNAL_TYPE_VIRTUAL) {
+		link_setting->lane_count = LANE_COUNT_FOUR;
+		link_setting->link_rate = LINK_RATE_HIGH3;
 	} else {
 		decide_dp_link_settings(link, link_setting, req_bw);
 	}