Patch for some Roland devices' USB digital audio

[Lucas]

A couple days ago, I found this excellent informational post, and that Mike
Oliphant's patch is in mainline now:
http://blog.nostatic.org/2020/01/getting-boss-gt-1-effects-processor-to.html

Since I was fairly certain it applies to the Roland devices I own, I added
my USB IDs.  Wonderfully, now USB audio capture seems to be working
perfectly from the three devices I can test: the INTEGRA-7, Boutique D-05,
& VG-99!

I don't know if the D-05 and VG-99 have digital audio playback/output, as I
only tried it with the INTEGRA-7.  It does work, but only when the
INTEGRA-7's "Sampling Rate" is set to "44.1 kHz" and "Ext Part Source
Select" is set to "USB AUDIO".

I searched a bit for other Roland devices people have had USB digital audio
issues with over the years, and took the liberty of adding them to the
patch too.  Likely there are still many more, especially in the Boutique
line, but I couldn't find their USB IDs.

I hope this can be added to the mainline kernel too, as this support should
help many that have struggled.  I, certainly, have been hoping somebody
would figure this out for quite a while, and even bought a USB
through/monitoring device to try to develop it myself (sadly, the software
supporting that has its own bugs, so I probably should've just used
wireshark).  Suffice it to say, I'm quite happy to have this figured out,
and to not have to delve into stuff I know nothing about! :)

Thanks,

  Lucas
-------------- next part --------------
A non-text attachment was scrubbed...
Name: linux-5.11.9-roland.patch
Type: text/x-patch
Size: 3550 bytes
Desc: not available
URL: <http://mailman.alsa-project.org/pipermail/alsa-devel/attachments/20210325/ae1e0211/attachment.bin>