drm/amd/display: Add symclk enable/disable during stream enable/disable

[Why & How]
Using dig_stream_mapper, program symclk_en and symclk_fe_src_sel when
enabling or disabling the corresponding stream.
Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Taimur Hassan <syed.hassan@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/dce110/dce110_hw_sequencer.c

@@ -1150,6 +1150,7 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx)
 	struct timing_generator *tg = pipe_ctx->stream_res.tg;
 	struct dtbclk_dto_params dto_params = {0};
 	int dp_hpo_inst;
+	struct stream_encoder *stream_enc = pipe_ctx->stream_res.stream_enc;
 
 	if (dc_is_hdmi_tmds_signal(pipe_ctx->stream->signal)) {
 		pipe_ctx->stream_res.stream_enc->funcs->stop_hdmi_info_packets(
@@ -1176,7 +1177,8 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx)
 		dccg->funcs->set_dtbclk_dto(dccg, &dto_params);
 		dccg->funcs->disable_symclk32_se(dccg, dp_hpo_inst);
 		dccg->funcs->set_dpstreamclk(dccg, REFCLK, tg->inst, dp_hpo_inst);
-	}
+	} else if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST && dccg->funcs->disable_symclk_se)
+		dccg->funcs->disable_symclk_se(dccg, stream_enc->stream_enc_inst);
 
 	if (dc->link_srv->dp_is_128b_132b_signal(pipe_ctx)) {
 		/* TODO: This looks like a bug to me as we are disabling HPO IO when

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

@@ -2719,6 +2719,8 @@ void dcn20_enable_stream(struct pipe_ctx *pipe_ctx)
 	struct dce_hwseq *hws = dc->hwseq;
 	unsigned int k1_div = PIXEL_RATE_DIV_NA;
 	unsigned int k2_div = PIXEL_RATE_DIV_NA;
+	struct link_encoder *link_enc = link_enc_cfg_get_link_enc(pipe_ctx->stream->link);
+	struct stream_encoder *stream_enc = pipe_ctx->stream_res.stream_enc;
 
 	if (dc->link_srv->dp_is_128b_132b_signal(pipe_ctx)) {
 		if (dc->hwseq->funcs.setup_hpo_hw_control)
@@ -2738,7 +2740,9 @@ void dcn20_enable_stream(struct pipe_ctx *pipe_ctx)
 		dto_params.timing = &pipe_ctx->stream->timing;
 		dto_params.ref_dtbclk_khz = dc->clk_mgr->funcs->get_dtb_ref_clk_frequency(dc->clk_mgr);
 		dccg->funcs->set_dtbclk_dto(dccg, &dto_params);
-	}
+	} else if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST && dccg->funcs->enable_symclk_se)
+		dccg->funcs->enable_symclk_se(dccg,
+			stream_enc->stream_enc_inst, link_enc->transmitter - TRANSMITTER_UNIPHY_A);
 
 	if (hws->funcs.calculate_dccg_k1_k2_values && dc->res_pool->dccg->funcs->set_pixel_rate_div) {
 		hws->funcs.calculate_dccg_k1_k2_values(pipe_ctx, &k1_div, &k2_div);

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

@@ -172,6 +172,15 @@ struct dccg_funcs {
 			struct dccg *dccg,
 			unsigned int dpp_inst,
 			bool clock_on);
+
+	void (*enable_symclk_se)(
+			struct dccg *dccg,
+			uint32_t stream_enc_inst,
+			uint32_t link_enc_inst);
+
+	void (*disable_symclk_se)(
+			struct dccg *dccg,
+			uint32_t stream_enc_inst);
 };
 
 #endif //__DAL_DCCG_H__

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

@@ -269,6 +269,7 @@ struct stream_encoder_funcs {
 		struct stream_encoder *enc, unsigned int pix_per_container);
 	void (*enable_fifo)(struct stream_encoder *enc);
 	void (*disable_fifo)(struct stream_encoder *enc);
+	void (*map_stream_to_link)(struct stream_encoder *enc, uint32_t stream_enc_inst, uint32_t link_enc_inst);
 };
 
 struct hpo_dp_stream_encoder_state {

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->map_stream_to_link)
+		stream_enc->funcs->map_stream_to_link(stream_enc,
+				stream_enc->stream_enc_inst, link_enc->transmitter - TRANSMITTER_UNIPHY_A);
 	if (stream_enc->funcs->enable_fifo)
 		stream_enc->funcs->enable_fifo(stream_enc);
 }