usb: dwc2: Disconnecting hub from rpi leads to errors

[Stefan Wahren]

Hi,

> Doug Anderson <dianders at chromium.org> hat am 27. Januar 2016 um 20:34
> geschrieben:
>
>
> Stefan,
>
> On Sat, Jan 23, 2016 at 9:08 AM, Stefan Wahren <stefan.wahren at i2se.com> wrote:
> > Hi,
> >
> >> Stefan Wahren <stefan.wahren at i2se.com> hat am 17. Januar 2016 um 04:36
> >> geschrieben:
> >>
> >>
> >> Hi,
> >>
> >> i have a Cherry G83 USB Keyboard connected to external 4 Port USB hub and
> >> this
> >> is connected to a Raspberry Pi B (Linux 4.4-rc7).
> >>
> >> If i disconnect the USB hub from the Pi, i will get multiple of this
> >> message:
> >>
> >> [ 103.558379] dwc2 20980000.usb: --Host Channel 1 Interrupt: Transaction
> >> Error--
> >> [ 103.558639] dwc2 20980000.usb: --Host Channel 6 Interrupt: Transaction
> >> Error--
> >> [ 103.558709] dwc2 20980000.usb: --Host Channel 7 Interrupt: Transaction
> >> Error--
> >> [ 103.558771] dwc2 20980000.usb: --Host Channel 3 Interrupt: Transaction
> >> Error--
> >> [ 103.558871] usb 1-1.2: clear tt 1 (9051) error -71
> >>
> >> If i reconnect the USB hub everything works as before.
>
> It would be interesting to find out what the root cause of the
> transaction error was, but perhaps things would be a little less bad
> with <https://chromium-review.googlesource.com/323773>?

just for the records the patch doesn't seem to have any effect.

If it's expected behavior, i'm okay with it.

> You might
> need to comment out your "Transaction Error" printouts, but then maybe
> things would at least be slightly better?
>
> I'm a little hesitant to post up another actual patch to the list
> since I fear I might have already overwhelmed (the currently out of
> office) John Young.
>
> -Doug