Re: PXA27x UDC Power

On Fri, 30 Nov 2007, Justin Clacherty wrote:

> > IMO it's a bug if the controller driver doesn't reduce the current draw
> > back to 100 mA after a disconnect/reconnect cycle.  (It also is up to
> > the controller driver to reduce the draw during a USB suspend.)
> >   
> 
> That's why I was suprised vbus_draw wasn't being called on disconnect.  

Like I said, it's a bug.

> During suspend should it go to zero or is 100 mA still ok?  While the 
> device may be off, the battery may still be charging.

During suspend, devices aren't allowed to draw more than 0.5 mA unless 
while awake they were configured for more than 100 mA and they are 
enabled for remote wakeup.  In that case they're allowed to draw up to 
2.5 mA.

Alan Stern


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