[PATCH 2/2] ALSA: usb-audio: Generic application of implicit fb to Roland/BOSS devices

[Lucas]

Most everything seems to be working, but I ran into a couple of, hopefully,
simple issues:

1. The UA-101 in its full speed (USB 1.1) mode times out for both capture
and playback, though its high speed (USB 2) mode is perfect.
(I'm using plughw to work with 2 channels here):
arecord -D plughw:UA101 -f S32_LE -r 48000 -c 2 ./file.wav
arecord: main:830: audio open error: Connection timed out

aplay -D plughw:UA101 -f S32_LE -r 48000 -c 2 ./other-file.wav
aplay: main:830: audio open error: Connection timed out

2.  I noticed with the INTEGRA-7 and the R-26, so far (with "pasuspender --
cat" running simultaneously):
When I first begin playback with aplay like,
"aplay -D hw:INTEGRA7 -f S32_LE -r 96000 -c 2 ./file.wav"
to play a long recording, and then start capturing for a while, while
that's still playing with something like,
"arecord -D hw:INTEGRA7 -f S32_LE -r 96000 -c 2 ./duplex-file.wav".
If I then end the arecord with ctrl-c before the aplay has finished, aplay
may end in the near future without finishing the entire playback, with this:
aplay: pcm_write:2061: write error: Input/output error

I may try beginning the capture first, and then starting aplay, but I've
run out of time for tonight.

If problem two can't be fixed, this functionality is certainly better than
before when it wasn't working at all.  I think JACK would keep the capture
and playback endpoints open, until itself closes, so it's probably a rare
person like me that would even notice it.

Thanks again!,

  Lucas