PCH_DPLL_SEL
temp = intel_de_read(display, PCH_DPLL_SEL);
intel_de_write(display, PCH_DPLL_SEL, temp);
intel_de_rmw(display, PCH_DPLL_SEL,
tmp = intel_de_read(display, PCH_DPLL_SEL);
MMIO_D(PCH_DPLL_SEL);