SHOTPLUG_CTL_DDI
dig_hotplug_reg = I915_READ(SHOTPLUG_CTL_DDI);
I915_WRITE(SHOTPLUG_CTL_DDI, dig_hotplug_reg);
hotplug = I915_READ(SHOTPLUG_CTL_DDI);
I915_WRITE(SHOTPLUG_CTL_DDI, hotplug);