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When MHI is in an active state, external device CPU cores can go into a low power mode while device data movers processing data transfer. Whenever host assert wake, it can cause device CPU to exit low power mode even though there is no work to be done. For downlink channels, assert wake only if MHI is in a low power mode to avoid unnecessary wake ups. CRs-Fixed: 2248650 Change-Id: I05ca7483a885237711a630844670e887572c13b7 Signed-off-by: Sujeev Dias <sdias@codeaurora.org>