PFIT_PGM_RATIOS
u32 tmp = intel_de_read(display, PFIT_PGM_RATIOS(display));
tmp = intel_de_read(display, PFIT_PGM_RATIOS(display));
intel_de_write(display, PFIT_PGM_RATIOS(display),
intel_de_read(display, PFIT_PGM_RATIOS(display));