BLC_PWM_PCH_CTL2
pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);