Re: xHCI and suspend/resume

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On Thursday, May 12, 2011, Alan Stern wrote:
> For new readers: The problem is that an xHCI USB host controller does
> not wake up a suspended system properly.
> 
> On Thu, 12 May 2011, Dwight Schauer wrote:
> 
> > Thanks Alan.
> > 
> > OK, this is with 2.6.39-rc7-gregkh
> > 
> > 05:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host
> > Controller (rev 03) (prog-if 30 [XHCI])
> >         Subsystem: Melco Inc Device 0241
> >         Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
> > ParErr- Stepping- SERR+ FastB2B- DisINTx+
> >         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
> > <TAbort- <MAbort- >SERR- <PERR- INTx-
> >         Interrupt: pin A routed to IRQ 17
> >         Region 0: Memory at fe9fe000 (64-bit, non-prefetchable) [size=8K]
> >         Capabilities: [50] Power Management version 3
> >                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
> > PME(D0+,D1-,D2-,D3hot+,D3cold-)
> >                 Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME+
> 
> That's the important part for power management and wakeup.  The 
> controller does support PCI wakeup.  In fact, at the time you ran lspci 
> the controller _was_ suspended and it was signalling a wakeup request!  
> Obviously something is wrong somewhere...
> 
> > @@@ With "on" in power/control I get this upon plugging in a keyboard:
> ...
> > @@@ and upon removing it:
> 
> All normal.
> 
> > @@@ If I put "auto" in power/control I get this:
> > 
> > xhci_hcd 0000:05:00.0: hcd_pci_runtime_suspend: 0
> > xhci_hcd 0000:05:00.0: PME# enabled
> 
> This means the controller was suspended with wakeup enabled, as it 
> should be.
> 
> > @@@ Upon plugging in a keyboard nothing.
> 
> Indeed, that is a problem.  Since wakeup doesn't work right at runtime, 
> it's not surprising that it also fails during system sleep.
> 
> > @@@ Setting power/wakeup to "enabled" (it was "disabled") has no
> > effect on this behaviour.
> 
> The power/wakeup attribute affects only the wakeup setting for system 
> sleep; it doesn't affect wakeups for runtime PM.
> 
> Clearly something is wrong.  But it looks like the problem might be
> somewhere else, not in the xHCI driver.  Is your BIOS up to date?
> 
> CC-ing the linux-pm mailing list in case anybody there has some ideas.

I need a boot log from 2.6.39-rc6 (or current Linus') on the affected system.

Thanks,
Rafael
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