+#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
+static void __drm_kms_helper_poll_enable(struct drm_device *dev)
+{
+ bool poll = false;
+ struct drm_connector *connector;
+
+ WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
+
+ if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
+ return;
+
+ drm_for_each_connector(connector, dev) {
+ if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
+ DRM_CONNECTOR_POLL_DISCONNECT))
+ poll = true;
+ }
+
+ if (poll)
+ schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
+}
+