Re: ehci_hcd causes box to resume immediately after suspend to RAM

On Thu, 14 Jun 2007, Rafael J. Wysocki wrote:

> > Hmmm...  If you turn on CONFIG_USB_DEBUG, what shows up in 
> > /sys/class/usb_host/usb_hostN/registers where N is the bus number of 
> > the controller?
> 
> bus pci, device 0000:00:1d.7 (driver 10 Dec 2004)
> EHCI Host Controller
> EHCI 1.00, hcd state 4
> ownership 00000001
> SMI sts/enable 0x80080000
> structural params 0x00103206
> capability params 0x00006871
> status 1008 Halt FLR
> command 010000 (park)=0 ithresh=1 period=1024 HALT
> intrenable 37 IAA FATAL PCD ERR INT
> uframe 36f1
> port 1 status 701000 POWER sig=se0
> port 2 status 701000 POWER sig=se0
> port 3 status 701000 POWER sig=se0
> port 4 status 701000 POWER sig=se0
> port 5 status 701000 POWER sig=se0
> port 6 status 701000 POWER sig=se0
> irq normal 0 err 0 reclaim 0 (lost 0)
> complete 0 unlink 0

Nothing special there.

> > Also, can you post a dmesg log (with CONFIG_USB_DEBUG enabled) showing 
> > what happens during the suspend and immediate resume?
> 
> [That's after I have disabled the wakeup on the EHCI  controller.]
...
> Restarting tasks ... <7>hub 1-0:1.0: state 7 ports 6 chg 0000 evt 0000
> ehci_hcd 0000:00:1d.7: GetStatus port 3 status 001020 POWER sig=se0 OCC
> hub 1-0:1.0: over-current change on port 3
> hub 1-0:1.0: trying to enable port power on non-switchable hub
> done.
> ehci_hcd 0000:00:1d.7: GetStatus port 4 status 001020 POWER sig=se0 OCC
> hub 1-0:1.0: over-current change on port 4
> hub 1-0:1.0: trying to enable port power on non-switchable hub
> ehci_hcd 0000:00:1d.7: GetStatus port 5 status 001020 POWER sig=se0 OCC
> hub 1-0:1.0: over-current change on port 5
> hub 1-0:1.0: trying to enable port power on non-switchable hub
> ehci_hcd 0000:00:1d.7: GetStatus port 6 status 001020 POWER sig=se0 OCC
> hub 1-0:1.0: over-current change on port 6
> hub 1-0:1.0: trying to enable port power on non-switchable hub

That's odd.  Where could these overcurrent changes be coming from?  
And how come they don't show up on ports 1 and 2?

There's an excellent chance that they are responsible for your 
immediate resumes.

Alan Stern


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