bm_rld semantics

I'm a little confused as to what BM_RLD actually does. Section 4.7.3.2.1 says only that setting BM_RLD enables bm activity to exit the C3 state. However, the last paragraph of 8.1.4 says that if BM_RLD is set after exiting C3, then it was exited at the request of a bus master. So in practice, do people implement one or both behaviors? If BM_RLD is set before C3 but zero after exiting it, does this mean it was exited due to an interrupt? It seems the Linux driver only uses BM_RLD as a control register.

Thanks,
Nate

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