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    Subject[PATCH 5.9 050/133] ALSA: usb-audio: Add implicit feedback quirk for Qu-16
    Date
    From: Geoffrey D. Bennett <g@b4.vu>

    commit 0938ecae432e7ac8b01080c35dd81d50a1e43033 upstream.

    This patch fixes audio distortion on playback for the Allen&Heath
    Qu-16.

    Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
    Cc: <stable@vger.kernel.org>
    Link: https://lore.kernel.org/r/20201104115717.GA19046@b4.vu
    Signed-off-by: Takashi Iwai <tiwai@suse.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    sound/usb/pcm.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/sound/usb/pcm.c
    +++ b/sound/usb/pcm.c
    @@ -336,6 +336,7 @@ static int set_sync_ep_implicit_fb_quirk
    switch (subs->stream->chip->usb_id) {
    case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
    case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
    + case USB_ID(0x22f0, 0x0006): /* Allen&Heath Qu-16 */
    ep = 0x81;
    ifnum = 3;
    goto add_sync_ep_from_ifnum;

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