BLC_PWM_CPU_CTL
return intel_de_read(display, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
tmp = intel_de_read(display, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
intel_de_write(display, BLC_PWM_CPU_CTL, tmp | level);
MMIO_D(BLC_PWM_CPU_CTL);