PCH_PP_CONTROL
MMIO_DH(PCH_PP_CONTROL, D_ALL, NULL, pch_pp_control_mmio_write);
MMIO_D(PCH_PP_CONTROL);
val = ioread32(mmio_base + PCH_PP_CONTROL) & 0xfffffffe;
iowrite32(val, mmio_base + PCH_PP_CONTROL);