drm_writeback_connector_init_with_encoder
ret = drm_writeback_connector_init_with_encoder(dev, wb_connector, &wb_connector->encoder,
EXPORT_SYMBOL(drm_writeback_connector_init_with_encoder);
ret = drm_writeback_connector_init_with_encoder(drm, &txp->connector,
int drm_writeback_connector_init_with_encoder(struct drm_device *dev,