[PATCH] ALSA: usb-audio: Filter out unsupported sample rates on Focusrite devices

[Alexander Tsoy]

В Сб, 18/04/2020 в 20:19 +0300, Alexander Tsoy пишет:
> Many Focusrite devices supports a limited set of sample rates per
> altsetting. This includes interfaces with ADAT ports and interfaces
> with
> dedicated feedback channels:
>  - Scarlett 18i6, 18i8 1st gen, 18i20 1st gen;
>  - Scarlett 18i8 2nd gen, 18i20 2nd gen;
>  - all Scarlett 3rd gen devices (feedback channels works only up to
> 96
>    kHz);

I might be wrong here. It seems that 3rd gen Scarletts other than 18i8
and 18i20 doesn't expose any additional altsettings to limit number of
channels. I'll resend this patch with updated description.