[PATCH v4 6/6] drm/i915/dp_link_training: Emit a link-status=Bad uevent with trigger property

[Gil Dekel]

When a link-training attempt fails, emit a uevent to user space that
includes the trigger property, which in this case will be
link-statue=Bad.

This will allow userspace to parse the uevent property and better
understand the reason for the previous modeset failure.

Signed-off-by: Gil Dekel <gildekel at chromium.org>

V2:
  - init link_status_property inline.
---
 drivers/gpu/drm/i915/display/intel_dp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index e8b10f59e141..328e9f030033 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -42,6 +42,7 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_probe_helper.h>
+#include <drm/drm_sysfs.h>

 #include "g4x_dp.h"
 #include "i915_drv.h"
@@ -5995,6 +5996,8 @@ static void intel_dp_modeset_retry_work_fn(struct work_struct *work)
 	struct intel_dp *intel_dp =
 		container_of(work, typeof(*intel_dp), modeset_retry_work);
 	struct drm_connector *connector = &intel_dp->attached_connector->base;
+	struct drm_property *link_status_property =
+		connector->dev->mode_config.link_status_property;

 	/* Set the connector's (and possibly all its downstream MST ports') link
 	 * status to BAD.
@@ -6011,7 +6014,7 @@ static void intel_dp_modeset_retry_work_fn(struct work_struct *work)
 	}
 	mutex_unlock(&connector->dev->mode_config.mutex);
 	/* Send Hotplug uevent so userspace can reprobe */
-	drm_kms_helper_connector_hotplug_event(connector);
+	drm_sysfs_connector_property_event(connector, link_status_property);
 }

 bool
--
Gil Dekel, Software Engineer, Google / ChromeOS Display and Graphics