musb_host: can suspend to ram while the device is still connected?

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Hi, ALL

I have a question about the musb suspend to ram in hostmode.
Can it suspend to ram while the device is still connected?

In mytest the suspend always failed because of "trying to suspend as
a_host while active".
Then if i want to suspend to ram I always need to unplug the device?

But the PC(ehci?) suspend to ram works well with USB keyboards still connected.
Would you please tell me does musb_host support this?

Thanks!
--
Regards,
--Bob
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