This patch adds a small helper function, which clears the cached
information about a hot-pluggable display, from connector. On event
This will run on event of a hot-unplug, keeping the connector's display
info up-to-date, avoiding any errors due to invalid cached data.

Forking this patch out from the 3 patch series:
        https://patchwork.freedesktop.org/patch/128961/
(still under review) and sending as individual patch.

Cc: Jose Abreu <joabreu at synopsys.com>
Cc: Daniel Vetter <daniel at ffwll.ch>

Suggested-by: Jose Abreu <joabreu at synopsys.com>
Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
---
 drivers/gpu/drm/drm_probe_helper.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/drm_probe_helper.c 
b/drivers/gpu/drm/drm_probe_helper.c
index 7cff91e..65a6a1f 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -164,6 +164,18 @@ void drm_kms_helper_poll_enable_locked(struct drm_device 
*dev)
 }

 /**
+ * drm_helper_clear_display_info - clean cached display information for
+ * hot pluggable displays, on event of hot-unplug
+ * @connector: connector under event
+ */
+void drm_helper_clear_display_info(struct drm_connector *connector)
+{
+       struct drm_display_info *info = &connector->display_info;
+
+       memset(info, 0, sizeof(*info));
+}
+
+/**
  * drm_helper_probe_single_connector_modes - get complete set of display modes
  * @connector: connector to probe
  * @maxX: max width for modes
@@ -288,6 +300,16 @@ int drm_helper_probe_single_connector_modes(struct 
drm_connector *connector,
                DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
                        connector->base.id, connector->name);
                drm_mode_connector_update_edid_property(connector, NULL);
+
+               /*
+                * Connector status change to disconnected, time to clean
+                * cached display information.
+                * Any driver which doesn't use this probe_helper function
+                * should implement update of EDID property and display_info
+                * on its own.
+                */
+               drm_helper_clear_display_info(connector);
+
                verbose_prune = false;
                goto prune;
        }
-- 
1.9.1

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