MI_MODE
I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(VS_TIMER_DISPATCH));
I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
__raw_i915_write32(dev_priv, MI_MODE, 0);
WA_SET_BIT_MASKED(MI_MODE, ASYNC_FLIP_PERF_DISABLE);