Re: [PATCH 17/25] USB OTG Langwell: Update PCI suspend/resume function

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On Wed, 4 Aug 2010, Alan Cox wrote:

> From: Hao Wu <hao.wu@xxxxxxxxx>
> 
> Update PCI suspend/resume function to fix suspend/resume issue. This
> modification will make sure in D3, Vbus is powered off, both client/host
> function will be stopped and controller moves to OTG IDLE state. Once it
> resumes back to work, state machine will restart from the IDLE state, and move
> to host/client based on inputs event.

Even though this patch isn't present in the revised patch series, I 
still wanted to ask a question about it.  Why should Vbus be powered 
off in D3?  Isn't the bus supposed to remain powered while everything 
is suspended?  Otherwise how can you detect plug/unplug events?

Alan Stern

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