drm/exynos: Initialize fbdev DRM client

Initialize the fbdev client in the fbdev code with empty helper
functions. Also clean up the client. The helpers will later
implement various functionality of the DRM client. No functional
changes.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_fbdev.c

@@ -135,6 +135,30 @@ static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 	.fb_probe =	exynos_drm_fbdev_create,
 };
 
+/*
+ * struct drm_client
+ */
+
+static void exynos_drm_fbdev_client_unregister(struct drm_client_dev *client)
+{ }
+
+static int exynos_drm_fbdev_client_restore(struct drm_client_dev *client)
+{
+	return 0;
+}
+
+static int exynos_drm_fbdev_client_hotplug(struct drm_client_dev *client)
+{
+	return 0;
+}
+
+static const struct drm_client_funcs exynos_drm_fbdev_client_funcs = {
+	.owner		= THIS_MODULE,
+	.unregister	= exynos_drm_fbdev_client_unregister,
+	.restore	= exynos_drm_fbdev_client_restore,
+	.hotplug	= exynos_drm_fbdev_client_hotplug,
+};
+
 int exynos_drm_fbdev_init(struct drm_device *dev)
 {
 	struct drm_fb_helper *helper;
@@ -149,11 +173,15 @@ int exynos_drm_fbdev_init(struct drm_device *dev)
 
 	drm_fb_helper_prepare(dev, helper, PREFERRED_BPP, &exynos_drm_fb_helper_funcs);
 
+	ret = drm_client_init(dev, &helper->client, "exynos-fbdev", &exynos_drm_fbdev_client_funcs);
+	if (ret)
+		goto err_drm_fb_helper_unprepare;
+
 	ret = drm_fb_helper_init(dev, helper);
 	if (ret < 0) {
 		DRM_DEV_ERROR(dev->dev,
 			      "failed to initialize drm fb helper.\n");
-		goto err_init;
+		goto err_drm_client_release;
 	}
 
 	ret = drm_fb_helper_initial_config(helper);
@@ -167,7 +195,9 @@ int exynos_drm_fbdev_init(struct drm_device *dev)
 
 err_setup:
 	drm_fb_helper_fini(helper);
-err_init:
+err_drm_client_release:
+	drm_client_release(&helper->client);
+err_drm_fb_helper_unprepare:
 	drm_fb_helper_unprepare(helper);
 	kfree(helper);
 
@@ -199,6 +229,7 @@ void exynos_drm_fbdev_fini(struct drm_device *dev)
 		return;
 
 	exynos_drm_fbdev_destroy(dev, fb_helper);
+	drm_client_release(&fb_helper->client);
 	drm_fb_helper_unprepare(fb_helper);
 	kfree(fb_helper);
 }