[Intel-gfx] [PATCH] drm/i915: Update the status of connector when receiving MST unplug event

[Ethan Hsieh]

We do not update the status of connector when receiving MST unplug event.
Call detect function to get latest status and then update status of connector.

Before applying the patch:
[313.665321] [drm:intel_get_hpd_pins [i915]] hotplug event received, stat 0x00200000, dig 0x10101012, pins 0x00000020
[313.665383] [drm:intel_hpd_irq_handler [i915]] digital hpd port B - long
[313.665436] [drm:intel_hpd_irq_handler [i915]] Received HPD interrupt on PIN 5 - cnt: 0
[313.665539] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port B - long
[313.944743] [drm:intel_dp_destroy_mst_connector [i915]]
[313.944848] [drm:intel_dp_destroy_mst_connector [i915]]

After applying the patch:
[43.175798] [drm:intel_dp_destroy_mst_connector [i915]] [CONNECTOR:70:DP-4] status updated from connected to disconnected
[43.175870] [drm:intel_dp_destroy_mst_connector [i915]]
[43.177675] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:70:DP-4]
[43.177679] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:70:DP-4] disconnected

Signed-off-by: Ethan Hsieh <ethan.hsieh at canonical.com>
---
 drivers/gpu/drm/i915/intel_dp_mst.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index e4ea968..b02a9a8 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -492,6 +492,20 @@ static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 {
 	struct intel_connector *intel_connector = to_intel_connector(connector);
 	struct drm_i915_private *dev_priv = to_i915(connector->dev);
+	enum drm_connector_status old_status;
+
+	mutex_lock(&connector->dev->mode_config.mutex);
+	old_status = connector->status;
+	connector->status = connector->funcs->detect(connector, false);
+
+	if (old_status != connector->status)
+		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
+			      connector->base.id,
+			      connector->name,
+			      drm_get_connector_status_name(old_status),
+			      drm_get_connector_status_name(connector->status));
+
+	mutex_unlock(&connector->dev->mode_config.mutex);
 
 	drm_connector_unregister(connector);
 
-- 
2.7.4