MI_ARB_STATE
I915_WRITE(MI_ARB_STATE, dev_priv->regfile.saveMI_ARB_STATE | 0xffff0000);
dev_priv->regfile.saveMI_ARB_STATE = I915_READ(MI_ARB_STATE);
I915_WRITE(MI_ARB_STATE,
I915_WRITE(MI_ARB_STATE,
I915_WRITE(MI_ARB_STATE, _MASKED_BIT_ENABLE(MI_ARB_C3_LP_WRITE_ENABLE));
I915_WRITE(MI_ARB_STATE,