GPCPLL_DVFS1
val = nvkm_rd32(device, GPCPLL_DVFS1);
nvkm_wr32(device, GPCPLL_DVFS1, val);
nvkm_mask(device, GPCPLL_DVFS1, GPCPLL_DVFS1_EN_DFS_BIT,
nvkm_mask(device, GPCPLL_DVFS1, GPCPLL_DVFS1_EN_DFS_CAL_BIT,
nvkm_mask(device, GPCPLL_DVFS1, GPCPLL_DVFS1_EN_DFS_CAL_BIT,
ret = nvkm_wait_usec(device, 10, GPCPLL_DVFS1,