linux-kernel - [PATCH 5.10 171/290] ALSA: usb: Add Plantronics C320-M USB ctrl msg delay quirk

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Date:   Mon, 15 Mar 2021 14:54:24 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andreas Kempe <kempe@...ator.liu.se>,
        John Ernberg <john.ernberg@...ia.se>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 5.10 171/290] ALSA: usb: Add Plantronics C320-M USB ctrl msg delay quirk

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

From: John Ernberg <john.ernberg@...ia.se>

commit fc7c5c208eb7bc2df3a9f4234f14eca250001cb6 upstream.

The microphone in the Plantronics C320-M headset will randomly
fail to initialize properly, at least when using Microsoft Teams.
Introducing a 20ms delay on the control messages appears to
resolve the issue.

Link: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/1065
Tested-by: Andreas Kempe <kempe@...ator.liu.se>
Signed-off-by: John Ernberg <john.ernberg@...ia.se>
Cc: <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20210303181405.39835-1-john.ernberg@actia.se
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/usb/quirks.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1672,6 +1672,14 @@ void snd_usb_ctl_msg_quirk(struct usb_de
 	    && (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
 		msleep(20);
 
+	/*
+	 * Plantronics C320-M needs a delay to avoid random
+	 * microhpone failures.
+	 */
+	if (chip->usb_id == USB_ID(0x047f, 0xc025)  &&
+	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
+		msleep(20);
+
 	/* Zoom R16/24, many Logitech(at least H650e/H570e/BCC950),
 	 * Jabra 550a, Kingston HyperX needs a tiny delay here,
 	 * otherwise requests like get/set frequency return