NV10_PGRAPH_SURFACE
NV10_PGRAPH_SURFACE,
tmp = nvkm_rd32(device, NV10_PGRAPH_SURFACE) & 0x0007ff00;
nvkm_wr32(device, NV10_PGRAPH_SURFACE, tmp);
tmp = nvkm_rd32(device, NV10_PGRAPH_SURFACE) | 0x00020100;
nvkm_wr32(device, NV10_PGRAPH_SURFACE, tmp);