On Mon, Apr 07, 2014 at 07:26:01PM +0300, Mathias Nyman wrote: > On 04/03/2014 07:32 PM, Johan Hovold wrote: > > Hi Mathias and Benjamin, > > > > Mathias, I understand you've got quite a lot on your plate with xhci at > > the moment, but have you had a change to look at this issue yet? It's an > > xhci-issue (possibly due to buggy hw) which seems related to the > > non-superspeed enumeration work that was made by Sarah and Dan during > > the fall. > > > > In summary, the device works fine with ehci, but fails to enumerate > > with xhci. Prior to 3.14 this resulted in babble errors, but since 3.14 > > it appears that enumeration times out instead: > > > > xhci_hcd 0000:00:14.0: Timeout while waiting for setup address command > > > > Sometimes it enumerates successfully with 3.14, though. > > > > Not sure if it's related, but Benjamin was also able to trigger: > > > > xhci_hcd 0000:00:14.0: HC died; cleaning up > > > > The full thread is available here: > > > > http://marc.info/?l=linux-usb&m=139464536212863&w=2 > > > > (The usb-serial related bits are really just about recognising the > > VID/PID and is unrelated to the xhci-enumeration problem.) > > > > Do you need any further information from Benjamin? > > It might be related to Dan's enumeration scheme change, but > looking at the xhci parts of the logs there seems to be both Address > command timeout and halting/stalling endpoint clearing issues. > > There is currently an issue with clearing halted endpoints and toggle > bit getting out of sync on xhci which I'm about to take on, this could > be related. > > http://marc.info/?l=libusb-devel&m=134930472420570&w=2 > > Hopefully, fixing that will solve some of the issues you are seeing as well. > > There's also a rfc patchset which completely changes how xhci handles > command timeouts. You could also test if it has any impact on the > address command timeout. > > http://marc.info/?l=linux-usb&m=139653559120996&w=2 Alright, thanks for taking a look. Benjamin, were you able to reproduce this on a different host controller? If you're interested in debugging this further you could try Mathias timeout RFC. I could prepare a branch for you to pull if that'd simplify things. Thanks, Johan -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
