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-rw-r--r--drivers/gpu/drm/drm_crtc_helper.c32
-rw-r--r--include/drm/drm_crtc.h1
2 files changed, 32 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 738a4294d82..f6829ba58e8 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -122,6 +122,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
int count = 0;
int mode_flags = 0;
bool verbose_prune = true;
+ enum drm_connector_status old_status;
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
drm_get_connector_name(connector));
@@ -137,7 +138,32 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
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,
+ drm_get_connector_name(connector),
+ 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;
+ schedule_delayed_work(&dev->mode_config.output_poll_work,
+ 0);
+ }
}
/* Re-enable polling in case the global poll config changed. */
@@ -985,7 +1011,11 @@ static void output_poll_execute(struct work_struct *work)
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;
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index b9ddd3d42ac..0fd007af8de 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -808,6 +808,7 @@ struct drm_mode_config {
/* output poll support */
bool poll_enabled;
bool poll_running;
+ bool delayed_event;
struct delayed_work output_poll_work;
/* pointers to standard properties */