[PATCH] drm/bridge/lontium-lt9611uxc: fix provided connector suport

[Dmitry Baryshkov]

- set DRM_CONNECTOR_POLL_HPD as the connector will generate hotplug
  events on its own

- do not call drm_kms_helper_hotplug_event() unless mode_config.funcs
  pointer is not NULL to remove possible kernel oops.

Fixes: bc6fa8676ebb ("drm/bridge/lontium-lt9611uxc: move HPD notification out 
of IRQ handler")
Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
---
 drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c 
b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
index 3cac16db970f..010657ea7af7 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
@@ -167,9 +167,10 @@ static void lt9611uxc_hpd_work(struct work_struct *work)
        struct lt9611uxc *lt9611uxc = container_of(work, struct lt9611uxc, 
work);
        bool connected;
 
-       if (lt9611uxc->connector.dev)
-               drm_kms_helper_hotplug_event(lt9611uxc->connector.dev);
-       else {
+       if (lt9611uxc->connector.dev) {
+               if (lt9611uxc->connector.dev->mode_config.funcs)
+                       drm_kms_helper_hotplug_event(lt9611uxc->connector.dev);
+       } else {
 
                mutex_lock(&lt9611uxc->ocm_lock);
                connected = lt9611uxc->hdmi_connected;
@@ -339,6 +340,8 @@ static int lt9611uxc_connector_init(struct drm_bridge 
*bridge, struct lt9611uxc
                return -ENODEV;
        }
 
+       lt9611uxc->connector.polled = DRM_CONNECTOR_POLL_HPD;
+
        drm_connector_helper_add(&lt9611uxc->connector,
                                 &lt9611uxc_bridge_connector_helper_funcs);
        ret = drm_connector_init(bridge->dev, &lt9611uxc->connector,
-- 
2.30.2