RE: ehci-fsl driver's power management

[Chen Peter-B29397 <B29397@xxxxxxxxxxxxx>]

> IIRC there was a problem involving timing.  Suspending the root hub
> might take too long for the OTG protocol.  But the problem goes farther
> than that; even when the root hub is suspended, somebody might still
> try to access it via usbfs.
> 
> Wouldn't it be better to unregister the host bus entirely when
> switching to device mode?  This seems more reliable than calling the
> controller's suspend routine.  The problem is how to do it quickly
> enough.
> 
I also think using usb_add(remove)_hcd is a good way for OTG switch, will try it
at FSL internal code first, then mainline it for FSL i.mx platform.

 


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