Re: [linux-pm] xHCI and suspend/resume

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On Thursday, May 12, 2011, Rafael J. Wysocki wrote:
> 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.

That should have been -rc7, sorry.

Thanks,
Rafael
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