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-rw-r--r--sound/usb/usbaudio.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index c7b902358b7b..44b9cdc8a83b 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -2661,7 +2661,7 @@ static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
2661 struct usb_interface_descriptor *altsd; 2661 struct usb_interface_descriptor *altsd;
2662 int i, altno, err, stream; 2662 int i, altno, err, stream;
2663 int format; 2663 int format;
2664 struct audioformat *fp; 2664 struct audioformat *fp = NULL;
2665 unsigned char *fmt, *csep; 2665 unsigned char *fmt, *csep;
2666 int num; 2666 int num;
2667 2667
@@ -2734,6 +2734,18 @@ static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
2734 continue; 2734 continue;
2735 } 2735 }
2736 2736
2737 /*
2738 * Blue Microphones workaround: The last altsetting is identical
2739 * with the previous one, except for a larger packet size, but
2740 * is actually a mislabeled two-channel setting; ignore it.
2741 */
2742 if (fmt[4] == 1 && fmt[5] == 2 && altno == 2 && num == 3 &&
2743 fp && fp->altsetting == 1 && fp->channels == 1 &&
2744 fp->format == SNDRV_PCM_FORMAT_S16_LE &&
2745 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
2746 fp->maxpacksize * 2)
2747 continue;
2748
2737 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT); 2749 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
2738 /* Creamware Noah has this descriptor after the 2nd endpoint */ 2750 /* Creamware Noah has this descriptor after the 2nd endpoint */
2739 if (!csep && altsd->bNumEndpoints >= 2) 2751 if (!csep && altsd->bNumEndpoints >= 2)