drm/udl: Init connector before encoder and CRTC

To mimic simple-pipe, we initialize the connector before the rest of
the display pipeline.

v2:
	* remove unnecessary calls to drm_connector_{register,unregister}()
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191210084905.5570-2-tzimmermann@suse.de

drivers/gpu/drm/udl/udl_connector.c

@@ -104,7 +104,6 @@ static void udl_connector_destroy(struct drm_connector *connector)
 					struct udl_drm_connector,
 					connector);
 
-	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
 	kfree(udl_connector->edid);
 	kfree(connector);
@@ -123,24 +122,22 @@ static const struct drm_connector_funcs udl_connector_funcs = {
 	.set_property = udl_connector_set_property,
 };
 
-int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
+struct drm_connector *udl_connector_init(struct drm_device *dev)
 {
 	struct udl_drm_connector *udl_connector;
 	struct drm_connector *connector;
 
 	udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
 	if (!udl_connector)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	connector = &udl_connector->connector;
 	drm_connector_init(dev, connector, &udl_connector_funcs,
 			   DRM_MODE_CONNECTOR_DVII);
 	drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 
-	drm_connector_register(connector);
-	drm_connector_attach_encoder(connector, encoder);
 	connector->polled = DRM_CONNECTOR_POLL_HPD |
 		DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 
-	return 0;
+	return connector;
 }

drivers/gpu/drm/udl/udl_drv.h

@@ -73,7 +73,7 @@ struct udl_device {
 int udl_modeset_init(struct drm_device *dev);
 void udl_modeset_restore(struct drm_device *dev);
 void udl_modeset_cleanup(struct drm_device *dev);
-int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder);
+struct drm_connector *udl_connector_init(struct drm_device *dev);
 
 struct drm_encoder *udl_encoder_init(struct drm_device *dev);
 

drivers/gpu/drm/udl/udl_modeset.c

@@ -421,7 +421,10 @@ static const struct drm_mode_config_funcs udl_mode_funcs = {
 
 int udl_modeset_init(struct drm_device *dev)
 {
+	struct drm_connector *connector;
 	struct drm_encoder *encoder;
+	int ret;
+
 	drm_mode_config_init(dev);
 
 	dev->mode_config.min_width = 640;
@@ -435,13 +438,22 @@ int udl_modeset_init(struct drm_device *dev)
 
 	dev->mode_config.funcs = &udl_mode_funcs;
 
+	connector = udl_connector_init(dev);
+	if (IS_ERR(connector)) {
+		ret = PTR_ERR(connector);
+		goto err_drm_mode_config_cleanup;
+	}
+
 	udl_crtc_init(dev);
 
 	encoder = udl_encoder_init(dev);
-
-	udl_connector_init(dev, encoder);
+	drm_connector_attach_encoder(connector, encoder);
 
 	return 0;
+
+err_drm_mode_config_cleanup:
+	drm_mode_config_cleanup(dev);
+	return ret;
 }
 
 void udl_modeset_restore(struct drm_device *dev)