nvkm_pci_mask
u32 nvkm_pci_mask(struct nvkm_pci *, u16 addr, u32 mask, u32 value);
nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);
nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
nvkm_pci_mask(pci, 0x460, 0x30, mask_value);
nvkm_pci_mask(pci, 0x460, 0x1, 0x1);
nvkm_pci_mask(pci, 0xa8, 0x3, reg_v);