SOUTH_CHICKEN1
val = I915_READ(SOUTH_CHICKEN1);
I915_WRITE(SOUTH_CHICKEN1, val);
temp = I915_READ(SOUTH_CHICKEN1);
I915_WRITE(SOUTH_CHICKEN1, temp);
POSTING_READ(SOUTH_CHICKEN1);
alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
schicken = I915_READ(SOUTH_CHICKEN1);
I915_WRITE(SOUTH_CHICKEN1, schicken);