1 files changed, 18 insertions, 19 deletions

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 8ae13de272c4..27fbd79d0daf 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -1159,11 +1159,13 @@ static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
                         drm_dp_put_port(port);
                         goto out;
                 }
-
-                drm_mode_connector_set_tile_property(port->connector);
-
+                if (port->port_num >= DP_MST_LOGICAL_PORT_0) {
+                        port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
+                        drm_mode_connector_set_tile_property(port->connector);
+                }
                 (*mstb->mgr->cbs->register_connector)(port->connector);
         }
+
 out:
         /* put reference to this port */
         drm_dp_put_port(port);
@@ -1188,8 +1190,8 @@ static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
         port->ddps = conn_stat->displayport_device_plug_status;
 
         if (old_ddps != port->ddps) {
-                dowork = true;
                 if (port->ddps) {
+                        dowork = true;
                 } else {
                         port->available_pbn = 0;
                 }
@@ -1294,13 +1296,8 @@ static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *m
                 if (port->input)
                         continue;
 
-                if (!port->ddps) {
-                        if (port->cached_edid) {
-                                kfree(port->cached_edid);
-                                port->cached_edid = NULL;
-                        }
+                if (!port->ddps)
                         continue;
-                }
 
                 if (!port->available_pbn)
                         drm_dp_send_enum_path_resources(mgr, mstb, port);
@@ -1311,12 +1308,6 @@ static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *m
                                 drm_dp_check_and_send_link_address(mgr, mstb_child);
                                 drm_dp_put_mst_branch_device(mstb_child);
                         }
-                } else if (port->pdt == DP_PEER_DEVICE_SST_SINK ||
-                        port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV) {
-                        if (!port->cached_edid) {
-                                port->cached_edid =
-                                        drm_get_edid(port->connector, &port->aux.ddc);
-                        }
                 }
         }
 }
@@ -1336,8 +1327,6 @@ static void drm_dp_mst_link_probe_work(struct work_struct *work)
                 drm_dp_check_and_send_link_address(mgr, mstb);
                 drm_dp_put_mst_branch_device(mstb);
         }
-
-        (*mgr->cbs->hotplug)(mgr);
 }
 
 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
@@ -1597,6 +1586,7 @@ static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
                         for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
                                 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
                         }
+                        (*mgr->cbs->hotplug)(mgr);
                 }
         } else {
                 mstb->link_address_sent = false;
@@ -2293,6 +2283,8 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
                         drm_dp_update_port(mstb, &msg.u.conn_stat);
 
                         DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type);
+                        (*mgr->cbs->hotplug)(mgr);
+
                 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
                         drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
                         if (!mstb)
@@ -2379,6 +2371,10 @@ enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector
 
         case DP_PEER_DEVICE_SST_SINK:
                 status = connector_status_connected;
+                /* for logical ports - cache the EDID */
+                if (port->port_num >= 8 && !port->cached_edid) {
+                        port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
+                }
                 break;
         case DP_PEER_DEVICE_DP_LEGACY_CONV:
                 if (port->ldps)
@@ -2433,7 +2429,10 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_
 
         if (port->cached_edid)
                 edid = drm_edid_duplicate(port->cached_edid);
-
+        else {
+                edid = drm_get_edid(connector, &port->aux.ddc);
+                drm_mode_connector_set_tile_property(connector);
+        }
         port->has_audio = drm_detect_monitor_audio(edid);
         drm_dp_put_port(port);
         return edid;