int count = 0;
int mode_flags = 0;
bool verbose_prune = true;
+ enum drm_connector_status old_status;
WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
if (connector->funcs->force)
connector->funcs->force(connector);
} else {
+ old_status = connector->status;
+
connector->status = connector->funcs->detect(connector, true);
+
+ /*
+ * Normally either the driver's hpd code or the poll loop should
+ * pick up any changes and fire the hotplug event. But if
+ * userspace sneaks in a probe, we might miss a change. Hence
+ * check here, and if anything changed start the hotplug code.
+ */
+ if (old_status != connector->status) {
+ DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
+ connector->base.id,
+ connector->name,
+ old_status, connector->status);
+
+ /*
+ * The hotplug event code might call into the fb
+ * helpers, and so expects that we do not hold any
+ * locks. Fire up the poll struct instead, it will
+ * disable itself again.
+ */
+ dev->mode_config.delayed_event = true;
+ if (dev->mode_config.poll_enabled)
+ schedule_delayed_work(&dev->mode_config.output_poll_work,
+ 0);
+ }
}
/* Re-enable polling in case the global poll config changed. */
struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
struct drm_connector *connector;
enum drm_connector_status old_status;
- bool repoll = false, changed = false;
+ bool repoll = false, changed;
+
+ /* Pick up any changes detected by the probe functions. */
+ changed = dev->mode_config.delayed_event;
+ dev->mode_config.delayed_event = false;
if (!drm_kms_helper_poll)
- return;
+ goto out;
mutex_lock(&dev->mode_config.mutex);
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
if (old_status != connector->status) {
const char *old, *new;
+ /*
+ * The poll work sets force=false when calling detect so
+ * that drivers can avoid to do disruptive tests (e.g.
+ * when load detect cycles could cause flickering on
+ * other, running displays). This bears the risk that we
+ * flip-flop between unknown here in the poll work and
+ * the real state when userspace forces a full detect
+ * call after receiving a hotplug event due to this
+ * change.
+ *
+ * Hence clamp an unknown detect status to the old
+ * value.
+ */
+ if (connector->status == connector_status_unknown) {
+ connector->status = old_status;
+ continue;
+ }
+
old = drm_get_connector_status_name(old_status);
new = drm_get_connector_status_name(connector->status);
mutex_unlock(&dev->mode_config.mutex);
+out:
if (changed)
drm_kms_helper_hotplug_event(dev);