[PATCH] ALSA: usb-audio: Apply sample rate quirk to Logitech Connect

[Ikjoon Jang]

On Wed, Mar 24, 2021, 7:16 PM Joakim Tjernlund <
Joakim.Tjernlund at infinera.com> wrote:

> On Wed, 2021-03-24 at 18:51 +0800, Ikjoon Jang wrote:
> > Logitech ConferenceCam Connect is a compound USB device with UVC and
> > UAC. Not 100% reproducible but sometimes it keeps responding STALL to
> > every control transfer once it receives get_freq request.
> >
> > This patch adds 046d:0x084c to a snd_usb_get_sample_rate_quirk list.
> >
> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203419
> > Signed-off-by: Ikjoon Jang <ikjn at chromium.org>
>
> Most Logitech USB headset I got needs a delay in snd_usb_ctl_msg_quirk()
> Have you tried to add say 20 ms delay in there?
>
>
I didn't try that. But it sounds reasonable to me.

let me try that quirk here. If that is the case, HID might need that delay
also. Logitech Group webcam had a similar problem on control xfer of
get_report from an another interface for HID.

And 20ms can be too long if it's applied to every control transfer. I will
test the device with shorter delay if you didn't try it before.

Any additional advice is welcome.

Thanks!

 Jocke
>
>