linux-kernel - [PATCH] ALSA: usb-audio: Fix microphone sound on Opencomm2 Headset

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Message-ID: <20231006044852.4181022-1-whalechang@google.com>
Date:   Fri,  6 Oct 2023 12:48:49 +0800
From:   Whale Chang <whalechang@...gle.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     WhaleChang <whalechang@...gle.com>, Ai Chao <aichao@...inos.cn>,
        Jaroslav Kysela <perex@...ex.cz>,
        John Keeping <john@...ping.me.uk>,
        Jussi Laako <jussi@...arnerd.net>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org
Subject: [PATCH] ALSA: usb-audio: Fix microphone sound on Opencomm2 Headset

From: WhaleChang <whalechang@...gle.com>

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@...gle.com>
---

 sound/usb/quirks.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 598659d761cc..d4bbef70d2f7 100644
--- 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;
 	}
 }
 
-- 
2.42.0.609.gbb76f46606-goog