NV03_PFIFO_CACHE1_GET
nvkm_wr32(device, NV03_PFIFO_CACHE1_GET, get + 4);
get = nvkm_rd32(device, NV03_PFIFO_CACHE1_GET);
nvkm_wr32(device, NV03_PFIFO_CACHE1_GET, get + 4);
nvkm_wr32(device, NV03_PFIFO_CACHE1_GET, 0);