drm/amd/display: Change return type of dm_helpers_dp_mst_stop_top_mgr

Prepare for future dm can have different implementation depends on the
return value.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Ian Chen <ian.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c

@@ -445,40 +445,24 @@ bool dm_helpers_dp_mst_start_top_mgr(
 	return (drm_dp_mst_topology_mgr_set_mst(&aconnector->mst_mgr, true) == 0);
 }
 
-void dm_helpers_dp_mst_stop_top_mgr(
+bool dm_helpers_dp_mst_stop_top_mgr(
 		struct dc_context *ctx,
 		struct dc_link *link)
 {
 	struct amdgpu_dm_connector *aconnector = link->priv;
-	uint8_t i;
 
 	if (!aconnector) {
 		DRM_ERROR("Failed to find connector for link!");
-		return;
+		return false;
 	}
 
 	DRM_INFO("DM_MST: stopping TM on aconnector: %p [id: %d]\n",
 			aconnector, aconnector->base.base.id);
 
-	if (aconnector->mst_mgr.mst_state == true) {
+	if (aconnector->mst_mgr.mst_state == true)
 		drm_dp_mst_topology_mgr_set_mst(&aconnector->mst_mgr, false);
 
-		for (i = 0; i < MAX_SINKS_PER_LINK; i++) {
-			if (link->remote_sinks[i] == NULL)
-				continue;
-
-			if (link->remote_sinks[i]->sink_signal ==
-			    SIGNAL_TYPE_DISPLAY_PORT_MST) {
-				dc_link_remove_remote_sink(link, link->remote_sinks[i]);
-
-				if (aconnector->dc_sink) {
-					dc_sink_release(aconnector->dc_sink);
-					aconnector->dc_sink = NULL;
-					aconnector->dc_link->cur_link_settings.lane_count = 0;
-				}
-			}
-		}
-	}
+	return false;
 }
 
 bool dm_helpers_dp_read_dpcd(

drivers/gpu/drm/amd/display/dc/core/dc_link.c

@@ -840,20 +840,22 @@ static bool discover_dp_mst_topology(struct dc_link *link, enum dc_detect_reason
 	return link->type == dc_connection_mst_branch;
 }
 
-static void reset_cur_dp_mst_topology(struct dc_link *link)
+static bool reset_cur_dp_mst_topology(struct dc_link *link)
 {
+	bool result = false;
 	DC_LOGGER_INIT(link->ctx->logger);
 
 	LINK_INFO("link=%d, mst branch is now Disconnected\n",
 		  link->link_index);
 
 	revert_dpia_mst_dsc_always_on_wa(link);
-	dm_helpers_dp_mst_stop_top_mgr(link->ctx, link);
+	result = dm_helpers_dp_mst_stop_top_mgr(link->ctx, link);
 
 	link->mst_stream_alloc_table.stream_count = 0;
 	memset(link->mst_stream_alloc_table.stream_allocations,
 			0,
 			sizeof(link->mst_stream_alloc_table.stream_allocations));
+	return result;
 }
 
 static bool should_prepare_phy_clocks_for_link_verification(const struct dc *dc,
@@ -1306,7 +1308,7 @@ static bool detect_link_and_local_sink(struct dc_link *link,
 bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason)
 {
 	bool is_local_sink_detect_success;
-	bool is_remote_sink_detect_required = false;
+	bool is_delegated_to_mst_top_mgr = false;
 	enum dc_connection_type pre_link_type = link->type;
 
 	is_local_sink_detect_success = detect_link_and_local_sink(link, reason);
@@ -1317,14 +1319,14 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason)
 	if (is_local_sink_detect_success && link->local_sink &&
 			dc_is_dp_signal(link->local_sink->sink_signal) &&
 			link->dpcd_caps.is_mst_capable)
-		is_remote_sink_detect_required = discover_dp_mst_topology(link, reason);
+		is_delegated_to_mst_top_mgr = discover_dp_mst_topology(link, reason);
 
 	if (is_local_sink_detect_success &&
 			pre_link_type == dc_connection_mst_branch &&
 			link->type != dc_connection_mst_branch)
-		reset_cur_dp_mst_topology(link);
+		is_delegated_to_mst_top_mgr = reset_cur_dp_mst_topology(link);
 
-	return is_local_sink_detect_success && !is_remote_sink_detect_required;
+	return is_local_sink_detect_success && !is_delegated_to_mst_top_mgr;
 }
 
 bool dc_link_get_hpd_state(struct dc_link *dc_link)

drivers/gpu/drm/amd/display/dc/dm_helpers.h

@@ -113,7 +113,7 @@ bool dm_helpers_dp_mst_start_top_mgr(
 		const struct dc_link *link,
 		bool boot);
 
-void dm_helpers_dp_mst_stop_top_mgr(
+bool dm_helpers_dp_mst_stop_top_mgr(
 		struct dc_context *ctx,
 		struct dc_link *link);
 /**