ALSA: usb-audio: add implicit fb quirk for Behringer UFX1204

Web:        https://git.kernel.org/torvalds/c/5e35dc0338d85ccebacf3f77eca1e5dea73155e8
Commit:     5e35dc0338d85ccebacf3f77eca1e5dea73155e8
Parent:     1f8ade92a83696986ad34438ce11e38975d1a43d
Refname:    refs/heads/master
Author:     Lassi Ylikojola <[email protected]>
AuthorDate: Fri Feb 9 16:51:36 2018 +0200
Committer:  Takashi Iwai <[email protected]>
CommitDate: Mon Feb 12 08:21:28 2018 +0100

    ALSA: usb-audio: add implicit fb quirk for Behringer UFX1204
    
    Add quirk to ensure a sync endpoint is properly configured.
    This patch is a fix for same symptoms on Behringer UFX1204 as patch
    from Albertto Aquirre on Dec 8 2016 for Axe-Fx II.
    
    Signed-off-by: Lassi Ylikojola <[email protected]>
    Cc: <[email protected]>
    Signed-off-by: Takashi Iwai <[email protected]>
---
 sound/usb/pcm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index b9c9a19f9588..3cbfae6604f9 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -352,6 +352,15 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 		ep = 0x86;
 		iface = usb_ifnum_to_if(dev, 2);
 
+		if (!iface || iface->num_altsetting == 0)
+			return -EINVAL;
+
+		alts = &iface->altsetting[1];
+		goto add_sync_ep;
+	case USB_ID(0x1397, 0x0002):
+		ep = 0x81;
+		iface = usb_ifnum_to_if(dev, 1);
+
 		if (!iface || iface->num_altsetting == 0)
 			return -EINVAL;
 
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