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
-Mathias
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