-/**
- * drm_fb_helper_defio_init - fbdev deferred I/O initialization
- * @fb_helper: driver-allocated fbdev helper
- *
- * This function allocates &fb_deferred_io, sets callback to
- * drm_fb_helper_deferred_io(), delay to 50ms and calls fb_deferred_io_init().
- * It should be called from the &drm_fb_helper_funcs->fb_probe callback.
- * drm_fb_helper_fbdev_teardown() cleans up deferred I/O.
- *
- * NOTE: A copy of &fb_ops is made and assigned to &info->fbops. This is done
- * because fb_deferred_io_cleanup() clears &fbops->fb_mmap and would thereby
- * affect other instances of that &fb_ops.
- *
- * Returns:
- * 0 on success or a negative error code on failure.
- */
-int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper)
-{
- struct fb_info *info = fb_helper->fbdev;
- struct fb_deferred_io *fbdefio;
- struct fb_ops *fbops;
-
- fbdefio = kzalloc(sizeof(*fbdefio), GFP_KERNEL);
- fbops = kzalloc(sizeof(*fbops), GFP_KERNEL);
- if (!fbdefio || !fbops) {
- kfree(fbdefio);
- kfree(fbops);
- return -ENOMEM;
- }
-
- info->fbdefio = fbdefio;
- fbdefio->delay = msecs_to_jiffies(50);
- fbdefio->deferred_io = drm_fb_helper_deferred_io;
-
- *fbops = *info->fbops;
- info->fbops = fbops;
-
- fb_deferred_io_init(info);
-
- return 0;
-}
-EXPORT_SYMBOL(drm_fb_helper_defio_init);
-