Before sending a uevent to userspace in order to trigger a corrective
modeset, we change the failing connector's link-status to BAD. However,
the downstream MST branch ports are left in their original GOOD state.
This patch utilizes the drm helper function
drm_dp_set_mst_topology_link_status() to rectify this and set all
downstream MST connectors' link-status to BAD before emitting the uevent
to userspace.
Signed-off-by: Gil Dekel <gildekel@xxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 42353b1ac487..e8b10f59e141 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5995,16 +5995,20 @@ static void intel_dp_modeset_retry_work_fn(struct work_struct *work)
struct intel_dp *intel_dp =
container_of(work, typeof(*intel_dp), modeset_retry_work);
struct drm_connector *connector = &intel_dp->attached_connector->base;
- drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s]\n", connector->base.id,
- connector->name);
- /* Grab the locks before changing connector property*/
- mutex_lock(&connector->dev->mode_config.mutex);
- /* Set connector link status to BAD and send a Uevent to notify
- * userspace to do a modeset.
+ /* Set the connector's (and possibly all its downstream MST ports') link
+ * status to BAD.
*/
+ mutex_lock(&connector->dev->mode_config.mutex);
+ drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] link status %d -> %d\n",
+ connector->base.id, connector->name,
+ connector->state->link_status, DRM_MODE_LINK_STATUS_BAD);
drm_connector_set_link_status_property(connector,
DRM_MODE_LINK_STATUS_BAD);
+ if (intel_dp->is_mst) {
+ drm_dp_set_mst_topology_link_status(&intel_dp->mst_mgr,
+ DRM_MODE_LINK_STATUS_BAD);
+ }
mutex_unlock(&connector->dev->mode_config.mutex);
/* Send Hotplug uevent so userspace can reprobe */
drm_kms_helper_connector_hotplug_event(connector);
--
Gil Dekel, Software Engineer, Google / ChromeOS Display and Graphics
