Support for NUX MG-300 USB interface

[Mike Oliphant]

As a last ditch effort before returning the device, I tried the clock patch
on a Raspberry Pi 4 running an older kernel, and... it works.

The kernel version is "Linux raspberrypi 4.19.89-v7l+" and is from late
February 2020.

Maybe a change between then and now broke something? I know there have been
a *lot* of changes since then, though...

Mike

On Wed, Jan 20, 2021 at 1:47 PM Mike Oliphant <oliphant at nostatic.org> wrote:

> Yeah, I tried every possible permutation of mute/volumes on the mixer
> controls.
>
> Thanks for submitting the patches. Maybe someone else will have better
> luck down the road.
>
> Mike
>
> On Wed, Jan 20, 2021 at 1:38 PM Takashi Iwai <tiwai at suse.de> wrote:
>
>> On Wed, 20 Jan 2021 22:17:35 +0100,
>> Mike Oliphant wrote:
>> >
>> > I spent a fair bit of time debugging the code setting/getting mixer
>> control
>> > values, and I can't see anything that seems to be operating incorrectly.
>>
>> So, even if you unmute and raise both mixers, it didn't help, right?
>> I took a look at the lsusb output, but I couldn't find anything else
>> suspicious.
>>
>> > Unless you have any other suggestions, I'm going to admit defeat and
>> return
>> > the audio interface.
>> >
>> > It is probably worth committing the clock selector patch - it at least
>> made
>> > capture work, and it may help with other audio interfaces.
>>
>> OK, I'll submit two fix patches.
>>
>>
>> thanks,
>>
>> Takashi
>>
>