[PATCH 1/2] ALSA: usb-audio: Add quirk for Fiero SC-01

[Takashi Iwai]

On Mon, 27 Jun 2022 12:00:34 +0200,
Egor Vorontsov wrote:
> 
> Fiero SC-01 is a USB sound card with two mono inputs and a single
> stereo output. The inputs are composed into a single stereo stream.
> 
> The device uses a vendor-provided driver on Windows and does not work
> at all without it. The driver mostly provides ASIO functionality, but
> also alters the way the sound card is queried for sample rates and
> clocks.
> 
> ALSA queries those failing with an EPIPE (same as Windows 10 does).
> Presumably, the vendor-provided driver does not query it at all, simply
> matching by VID:PID. Thus, I consider this a buggy firmware and adhere
> to a set of fixed endpoint quirks instead.
> 
> The soundcard has an internal clock. Implicit feedback mode is required
> for the playback.
> 
> I have updated my device to v1.1.0 from a Windows 10 VM using a vendor-
> provided binary prior to the development, hoping for it to just begin
> working. The device provides no obvious way to downgrade the firmware,
> and regardless, there's no binary available for v1.0.0 anyway.
> 
> Thus, I will be getting another unit to extend the patch with support
> for that. Expected to be a simple copy-paste of the existing one,
> though.
> 
> There were no previous reports of that device in context of Linux
> anywhere. Other issues have been reported though, but that's out of the
> scope.
> 
> Signed-off-by: Egor Vorontsov <sdoregor at sdore.me>

Thanks, now applied both patches.


Takashi