usb: dwc2: Disconnecting hub from rpi leads to errors

[Stefan Wahren]

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.

i applied the following series from Douglas Anderson

[PATCH v5 0/21] usb: dwc2: host: Fix and speed up all the stuff, especially with
splits

[PATCH] usb: dwc2: host: Properly set the HFIR

but the issue still occurs.

>
> If i replace the Raspberry Pi B with a Olimex Olinuxino iMX233 Maxi (Chipidea
> USB) the errors doesn't occure after disconnecting the hub. So i assume this
> issue is specific to dwc2 or Raspberry Pi. This issue doesn't look like a
> regression.
>
> The output of dmesg and lsusb -v can be found on gist [1].
>
> Best regards
> Stefan
>
> [1] - https://gist.github.com/lategoodbye/dd04293078f2d8afbf73