In case of HDMI2.1 FRL training failure for a given mode, the user
should be sent a uevent signalling Link failure.
This patch adds support for sending uevent to userspace in case of link
training failure.
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_hdmi.c | 30 +++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 1eadf77dc819..9e8ee6d5bc5d 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2944,6 +2944,31 @@ void intel_infoframe_init(struct intel_digital_port *dig_port)
}
}
+/* Common code with DP, need to put in a common place */
+static void intel_hdmi_modeset_retry_work_fn(struct work_struct *work)
+{
+ struct intel_connector *intel_connector;
+ struct drm_connector *connector;
+
+ intel_connector = container_of(work, typeof(*intel_connector),
+ modeset_retry_work);
+ connector = &intel_connector->base;
+ DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
+ connector->name);
+
+ /* Grab the locks before changing connector property*/
+ mutex_lock(&connector->dev->mode_config.mutex);
+ /*
+ * Set connector link status to BAD and send a Uevent to notify
+ * userspace to do a modeset.
+ */
+ drm_connector_set_link_status_property(connector,
+ DRM_MODE_LINK_STATUS_BAD);
+ mutex_unlock(&connector->dev->mode_config.mutex);
+ /* Send Hotplug uevent so userspace can reprobe */
+ drm_kms_helper_hotplug_event(connector->dev);
+}
+
void intel_hdmi_init_connector(struct intel_digital_port *dig_port,
struct intel_connector *intel_connector)
{
@@ -3021,6 +3046,11 @@ void intel_hdmi_init_connector(struct intel_digital_port *dig_port,
&conn_info);
if (!intel_hdmi->cec_notifier)
drm_dbg_kms(&dev_priv->drm, "CEC notifier get failed\n");
+
+ /* Initialize the work for modeset in case of link train failure */
+ if (DISPLAY_VER(dev_priv) >= 14)
+ INIT_WORK(&intel_connector->modeset_retry_work,
+ intel_hdmi_modeset_retry_work_fn);
}
/*
--
2.25.1
