From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: John Ernberg john.ernberg@actia.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@lysator.liu.se Signed-off-by: John Ernberg john.ernberg@actia.se Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210303181405.39835-1-john.ernberg@actia.se Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/usb/quirks.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -1670,6 +1670,14 @@ 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