Re: [Alsa-user] Tascam US-122 and Raspberry Pi
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From: <jm...@vo...> - 2013-10-30 20:38:59
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> Gesendet: Mittwoch, 30. Oktober 2013 um 19:50 Uhr > Von: "Daniel Mack" <zo...@gm...> > On 10/30/2013 07:01 PM, jm...@vo... wrote: > >> Gesendet: Mittwoch, 30. Oktober 2013 um 18:11 Uhr > >> Von: "Daniel Mack" <zo...@gm...> > >> On 10/30/2013 02:42 PM, jm...@vo... wrote: > >>>> On 10/30/2013 11:39 AM, jm...@vo... wrote: > >>>>>> On 10/30/2013 09:17 AM, jm...@vo... wrote: > >> > >>>>> Sequence Error!(hcd_frame=10797 ep=8in;wait=2,frame=3). Most > >>>>> probably some urb of usb-frame 2 is still missing. Cause could be > >>>>> too long delays in usb-hcd interrupt handling. > >>>> > >>>> We've recently fixed this by removing some code. Please try this > >>>> patch: > >>>> > >>>> > >>>> https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/?id=a9d14bc0b188a822e42787d01e56c06fe9750162 > >>>> > >>> Ok, I applied the patch and recompiled the module. dmesg now shows no > >>> error but I still get the input/output error. > >> > >> Hmm, then I don't know right now. You should try some other USB audio > >> device such as a headset, just to see whether the USB host controller > >> has a general problem with isochronous transfers and such. If that works > >> fine, I guess someone needs to look into the usx2y driver. > > > > A Behringer UCG102 works without problems. Can you advice me on what to do to debug the error? > > You can check whether the driver sends out packets at all > (usb_submit_urb()) and if they succeed. Maybe the Raspberry is even > powerful enough to create usbmon traces that you can analyze in > wireshark. Read Documentation/usb/usbmon.txt for more information on > that topic. I created an usbmon trace with wireshark while running aplay. It's available here: http://wikisend.com/download/456946/us122.pcapng I have to admit that until now I don't know much about usb communication. Please, can you have a look at the trace? Thank you! Jochen |