nv50_lut_init
ret = nv50_lut_init(disp, &drm->client.mmu, &head->olut);
int nv50_lut_init(struct nv50_disp *, struct nvif_mmu *, struct nv50_lut *);
ret = nv50_lut_init(disp, mmu, &wndw->ilut);