drm/client: Send pending hotplug events after resume

If a hotplug event arrives while the client has been suspended,
DRM's client code will deliver the event after resuming. The
functionality has been taken form i915, where it can be removed
by a later commit.

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Maarten Lankhorst <[email protected]>

Author: Thomas Zimmermann

drivers/gpu/drm/drm_client_event.c

@@ -60,6 +60,12 @@ static void drm_client_hotplug(struct drm_client_dev *client)
 	if (client->hotplug_failed)
 		return;
 
+	if (client->suspended) {
+		client->hotplug_pending = true;
+		return;
+	}
+
+	client->hotplug_pending = false;
 	ret = client->funcs->hotplug(client);
 	drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);
 	if (ret)
@@ -159,6 +165,9 @@ static int drm_client_resume(struct drm_client_dev *client, bool holds_console_l
 
 	client->suspended = false;
 
+	if (client->hotplug_pending)
+		drm_client_hotplug(client);
+
 	return ret;
 }
 

include/drm/drm_client.h

@@ -142,6 +142,14 @@ struct drm_client_dev {
 	 */
 	bool suspended;
 
+	/**
+	 * @hotplug_pending:
+	 *
+	 * A hotplug event has been received while the client was suspended.
+	 * Try again on resume.
+	 */
+	bool hotplug_pending;
+
 	/**
 	 * @hotplug_failed:
 	 *