ALSA: usb-audio: Fix microphone sound on Opencomm2 Headset

When a Opencomm2 Headset is connected to a Bluetooth USB dongle,
the audio playback functions properly, but the microphone does not work.

In the dmesg logs, there are messages indicating that the init_pitch
function fails when the capture process begins.

The microphone only functions when the ep pitch control is not set.

Toggling the pitch control off bypasses the init_piatch function
and allows the microphone to work.

Signed-off-by: WhaleChang <whalechang@google.com>
Link: https://lore.kernel.org/r/20231006044852.4181022-1-whalechang@google.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 598659d..d4bbef7 100644 (file)
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1994,7 +1994,11 @@ void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip,
                /* mic works only when ep packet size is set to wMaxPacketSize */
                fp->attributes |= UAC_EP_CS_ATTR_FILL_MAX;
                break;
-
+       case USB_ID(0x3511, 0x2b1e): /* Opencomm2 UC USB Bluetooth dongle */
+               /* mic works only when ep pitch control is not set */
+               if (stream == SNDRV_PCM_STREAM_CAPTURE)
+                       fp->attributes &= ~UAC_EP_CS_ATTR_PITCH_CONTROL;
+               break;
        }
 }