drm/amd/display: Fix MST recognizes connected displays as one

[What]
MST now recognizes both connected displays

Fixes: 927e784 ("drm/amd/display: Add symclk enable/disable during stream enable/disable")
Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Muhammad Ahmed <ahmed.ahmed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Muhammad Ahmed

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -1178,12 +1178,15 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx)
 		dto_params.otg_inst = tg->inst;
 		dto_params.timing = &pipe_ctx->stream->timing;
 		dp_hpo_inst = pipe_ctx->stream_res.hpo_dp_stream_enc->inst;
-		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)
+		if (dccg) {
+			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 (dccg && dccg->funcs->disable_symclk_se) {
 		dccg->funcs->disable_symclk_se(dccg, stream_enc->stream_enc_inst,
 				link_enc->transmitter - TRANSMITTER_UNIPHY_A);
+	}
 
 	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
@@ -2658,11 +2661,11 @@ void dce110_prepare_bandwidth(
 	struct clk_mgr *dccg = dc->clk_mgr;
 
 	dce110_set_safe_displaymarks(&context->res_ctx, dc->res_pool);
-
-	dccg->funcs->update_clocks(
-			dccg,
-			context,
-			false);
+	if (dccg)
+		dccg->funcs->update_clocks(
+				dccg,
+				context,
+				false);
 }
 
 void dce110_optimize_bandwidth(
@@ -2673,10 +2676,11 @@ void dce110_optimize_bandwidth(
 
 	dce110_set_displaymarks(dc, context);
 
-	dccg->funcs->update_clocks(
-			dccg,
-			context,
-			true);
+	if (dccg)
+		dccg->funcs->update_clocks(
+				dccg,
+				context,
+				true);
 }
 
 static void dce110_program_front_end_for_pipe(

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

@@ -2692,8 +2692,6 @@ 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)
@@ -2713,10 +2711,8 @@ 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);
-
+	} else {
+		}
 	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/dcn32/dcn32_mpc.c

@@ -75,7 +75,7 @@ void mpc32_power_on_blnd_lut(
 		if (power_on) {
 			REG_UPDATE(MPCC_MCM_MEM_PWR_CTRL[mpcc_id], MPCC_MCM_1DLUT_MEM_PWR_FORCE, 0);
 			REG_WAIT(MPCC_MCM_MEM_PWR_CTRL[mpcc_id], MPCC_MCM_1DLUT_MEM_PWR_STATE, 0, 1, 5);
-		} else {
+		} else if (!mpc->ctx->dc->debug.disable_mem_low_power) {
 			ASSERT(false);
 			/* TODO: change to mpc
 			 *  dpp_base->ctx->dc->optimized_required = true;