ALSA: usb-audio: add implicit fb quirk for Axe-Fx II

The Axe-Fx II implicit feedback end point and the data sync endpoint
are in different interface descriptors. Add quirk to ensure a sync
endpoint is properly configured.

Signed-off-by: Alberto Aguirre <albaguirre@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index a522c9af1f34..34c6d4f2c0b6 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -348,6 +348,16 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 
                 alts = &iface->altsetting[1];
                 goto add_sync_ep;
+        case USB_ID(0x2466, 0x8003):
+                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;
+
         }
         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&