Revert "drm/dp/mst: change MST detection scheme"

This reverts commit cfcfa086d43ced33e1099b9befb12f17fca102e1.

This causes the tiling properties to break in some unexpected ways,

Revert it for now.

Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 8ae13de272c43a7f79822098318a5c5317b54483..27fbd79d0daf0003be2014cee00c9dcdb49fdb43 100644 (file)
--- 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;