Ignored USB-audio implicit feedback in kernel 5.8rc3

[Pavel Hofman]

Dne 07. 07. 20 v 12:34 Alexander Tsoy napsal(a):
> В Чт, 02/07/2020 в 13:28 +0200, Pavel Hofman пишет:
> 
> USB Audio Class specs are pretty clear about it: only one isochronous
> endpoint is allowed per interface. And it can be accompanied by the
> *explicit* feedback endpoint.
> 
> I have patches that implement autodetection of implicit feedback, but I
> need to clean them up and be careful not to break Scarlett 18i8/18i20
> 3rd Gen (these devices have 3 altsettings per interface and probably
> require some additional sample rates filtering, so that each sample
> rate uniquely match one single altsetting).
> 

Alexander, thanks for the clarification. If I understand correctly the 
existing single-interface condition is incorrect and no 
implicit-feedback device can work without a quirk now.

Thanks for your WIP patches, very much appreciated.

Best regards,

Pavel.