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GEM VRAM provides an implementation for prepare_fb() and cleanup_fb() of struct drm_plane_helper_funcs. Switch over vboxvideo. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20191024081404.6978-5-tzimmermann@suse.de