RE: USB timeout during S3 suspend w/ NEC Corporation uPD720200

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> -----Original Message-----
> From: Sarah Sharp [mailto:sarah.a.sharp@xxxxxxxxxxxxxxx]
> Sent: Tuesday, March 13, 2012 12:11 AM
> To: Xu, Andiry
> Cc: Thilo-Alexander Ginkel; linux-usb@xxxxxxxxxxxxxxx
> Subject: Re: USB timeout during S3 suspend w/ NEC Corporation uPD720200
> 
> On Mon, Mar 12, 2012 at 03:20:41AM +0000, Xu, Andiry wrote:
> > > -----Original Message-----
> > > From: Thilo-Alexander Ginkel [mailto:thilo@xxxxxxxxxx]
> > > Sent: Sunday, March 11, 2012 5:17 AM
> > > To: Xu, Andiry
> > > Cc: linux-usb@xxxxxxxxxxxxxxx; Sarah Sharp
> > > Subject: Re: USB timeout during S3 suspend w/ NEC Corporation uPD720200
> > >
> > > On Wed, Mar 7, 2012 at 05:44, Andiry Xu <andiry.xu@xxxxxxx> wrote:
> > > > On 03/07/2012 06:42 AM, Thilo-Alexander Ginkel wrote:
> > > >> On Fri, Mar 2, 2012 at 21:20, Thilo-Alexander Ginkel
> <thilo@xxxxxxxxxx>  wrote:
> > > ...
> > > xhci_hcd 0000:0d:00.0: Poll event ring: 4308439040
> > > xhci_hcd 0000:0d:00.0: op reg status = 0xffffffff
> > > xhci_hcd 0000:0d:00.0: HW died, polling stopped.
> > >
> >
> > This means your host controller is dead after suspend: op reg status
> > reads 0xffffffff indicates the xHC is not working at all, it's in
> > a status like "plug out".
> 
> It doesn't necessarily mean that the host got removed.  When the PCI
> host controller goes into D3, the registers will read as 0xffffffff.  So
> I suspect the host was just suspended when the polling loop ran.  We
> need a better way for the polling loop to know the host controller died
> instead of checking the registers.
> 

I agree with you, but for this case, the suspend is actually failed:
Stop xHC in xhci_suspend() timeout and the function returns -110.
The save state register is not set. I think the PCI host controller
does not go into D3 in this case, right? 

Thanks,
Andiry

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