[PATCH 4.20 44/57] drm/amdgpu: Dont ignore rc from drm_dp_mst_topology_mgr_resume()

[Greg Kroah-Hartman]

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lyude Paul <lyude@xxxxxxxxxx>

commit fe7553bef8d676d1d8b40666868b33ec39b9df5d upstream.

drm_dp_mst_topology_mgr_resume() returns whether or not it managed to
find the topology in question after a suspend resume cycle, and the
driver is supposed to check this value and disable MST accordingly if
it's gone-in addition to sending a hotplug in order to notify userspace
that something changed during suspend.

Currently, amdgpu just makes the mistake of ignoring the return code
from drm_dp_mst_topology_mgr_resume() which means that if a topology was
removed in suspend, amdgpu never notices and assumes it's still
connected which leads to all sorts of problems.

So, fix this by actually checking the rc from
drm_dp_mst_topology_mgr_resume(). Also, reformat the rest of the
function while we're at it to fix the over-indenting.

Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Cc: Jerry Zuo <Jerry.Zuo@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.15+
Link: https://patchwork.freedesktop.org/patch/msgid/20190108211133.32564-2-lyude@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |   34 +++++++++++++++-------
 1 file changed, 24 insertions(+), 10 deletions(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -645,22 +645,36 @@ static void s3_handle_mst(struct drm_dev
 {
 	struct amdgpu_dm_connector *aconnector;
 	struct drm_connector *connector;
+	struct drm_dp_mst_topology_mgr *mgr;
+	int ret;
+	bool need_hotplug = false;
 
 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
-		   aconnector = to_amdgpu_dm_connector(connector);
-		   if (aconnector->dc_link->type == dc_connection_mst_branch &&
-				   !aconnector->mst_port) {
-
-			   if (suspend)
-				   drm_dp_mst_topology_mgr_suspend(&aconnector->mst_mgr);
-			   else
-				   drm_dp_mst_topology_mgr_resume(&aconnector->mst_mgr);
-		   }
+	list_for_each_entry(connector, &dev->mode_config.connector_list,
+			    head) {
+		aconnector = to_amdgpu_dm_connector(connector);
+		if (aconnector->dc_link->type != dc_connection_mst_branch ||
+		    aconnector->mst_port)
+			continue;
+
+		mgr = &aconnector->mst_mgr;
+
+		if (suspend) {
+			drm_dp_mst_topology_mgr_suspend(mgr);
+		} else {
+			ret = drm_dp_mst_topology_mgr_resume(mgr);
+			if (ret < 0) {
+				drm_dp_mst_topology_mgr_set_mst(mgr, false);
+				need_hotplug = true;
+			}
+		}
 	}
 
 	drm_modeset_unlock(&dev->mode_config.connection_mutex);
+
+	if (need_hotplug)
+		drm_kms_helper_hotplug_event(dev);
 }
 
 static int dm_hw_init(void *handle)