STOP_RING
I915_WRITE_FW(mode, _MASKED_BIT_ENABLE(STOP_RING));
_MASKED_BIT_DISABLE(STOP_RING));
_MASKED_BIT_DISABLE(STOP_RING));
if (I915_READ(RING_MI_MODE(engine->mmio_base)) & STOP_RING) {
I915_WRITE_MODE(engine, _MASKED_BIT_ENABLE(STOP_RING));
I915_WRITE_MODE(engine, _MASKED_BIT_DISABLE(STOP_RING));