A recent update to the specification makes it clear that the host
is expected to wait for the device to acknowledge the Enable bit
transitioning to 0 as well as waiting for the device to acknowledge a
transition to 1.
Reported-by: NKhosrow Panah <Khosrow.Panah@idt.com>
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>
Reviewed-by: NKeith Busch <keith.busch@intel.com>