Hotplugging a monitor in DP MST configuration triggers short pulses.
Although the short pulse handling path ends up in the MST hotplug function,
we do not perform a detect before sending the hotplug uvent. This leads to
the connector status not being updated when the userspace calls
DRM_IOCTL_MODE_GETCONNECTOR.
So, let's call the connector function ->detect() to update the connector
status before sending the uevent.
v2: Update connector status inside mode_config mutex (Ville)
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp_mst.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 3ffbd69..8e36a96 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -492,8 +492,28 @@ static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
+ struct intel_connector *intel_connector;
+ bool changed = false;
+ enum drm_connector_status old_status;
+ struct drm_mode_config *mode_config = &dev->mode_config;
+
+ mutex_lock(&mode_config->mutex);
+ for_each_intel_connector(dev, intel_connector) {
+ struct drm_connector *connector = &(intel_connector->base);
+
+ if (intel_connector->mst_port != intel_dp)
+ continue;
+
+ old_status = connector->status;
+ connector->status = connector->funcs->detect(connector, false);
+
+ if (old_status != connector->status)
+ changed = true;
+ }
+ mutex_unlock(&mode_config->mutex);
- drm_kms_helper_hotplug_event(dev);
+ if (changed)
+ drm_kms_helper_hotplug_event(dev);
}
static const struct drm_dp_mst_topology_cbs mst_cbs = {
--
2.7.4
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