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. Change-Id: Iaae8f0b12b8bce4b16ecad63063c04d3c8ec93a8 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 2e562e09c704e..71f54e56c4434 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -5326,16 +5326,20 @@ 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