[PATCH v3] ALSA: usb-audio: Fix microphone sound on Jieli webcam.

[Takashi Iwai]

On Mon, 18 Oct 2021 18:25:52 +0200,
Marco Giunta wrote:
> 
> When a Jieli Technology USB Webcam is connected, the video part works
> well, but the mic sound is speeded up. On dmesg there are messages
> about different rates from the runtime rates, warnings about volume
> resolution and lastly, the log is filled, every 5 seconds, with
> retire_capture_urb error messages.
> 
> The mic works only when ep packet size is set to wMaxPacketSize (normal
> sound and no more retire_capture_urb error messages). Skipping reading
> sample rate, fixes the messages about different rates and forcing a volume
> resolution, fixes warnings about volume range. I have arbitrarily choosed
> the value (16): I read in a comment that there should be no more than 255
> levels, so 4096 (max volume) / 16 = 0-255.
> 
> Signed-off-by: Marco Giunta <giun7a at gmail.com>

Thanks, now applied.


Takashi