Patch "ALSA: usb-audio: Fix TEAC UD-501/UD-503/NT-503 usb delay" has been added to the 4.3-stable tree

This is a note to let you know that I've just added the patch titled

    ALSA: usb-audio: Fix TEAC UD-501/UD-503/NT-503 usb delay

to the 4.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     alsa-usb-audio-fix-teac-ud-501-ud-503-nt-503-usb-delay.patch

and it can be found in the queue-4.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Guillaume Fougnies <[email protected]>
Date: Tue, 26 Jan 2016 00:28:27 +0100
Subject: ALSA: usb-audio: Fix TEAC UD-501/UD-503/NT-503 usb delay

From: Guillaume Fougnies <[email protected]>

commit 5a4ff9ec8d6edd2ab1cfe8ce6a080d6e57cbea9a upstream.

TEAC UD-501/UD-503/NT-503 fail to switch properly between different rate/format. Similar to 'Playback Design', this patch corrects the invalid clock source error for TEAC products and avoids complete freeze of the usb interface of 503 series.

---
 sound/usb/quirks.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

@@ -1202,8 +1202,12 @@ void snd_usb_set_interface_quirk(struct
 	 * "Playback Design" products need a 50ms delay after setting the
 	 * USB interface.
 	 */
-	if (le16_to_cpu(dev->descriptor.idVendor) == 0x23ba)
+	switch (le16_to_cpu(dev->descriptor.idVendor)) {
+	case 0x23ba: /* Playback Design */
+	case 0x0644: /* TEAC Corp. */
 		mdelay(50);
+		break;
+	}
 }
 
 void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,

@@ -1218,6 +1222,14 @@ void snd_usb_ctl_msg_quirk(struct usb_de
 	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
 		mdelay(20);
 
+	/*
+	 * "TEAC Corp." products need a 20ms delay after each
+	 * class compliant request
+	 */
+	if ((le16_to_cpu(dev->descriptor.idVendor) == 0x0644) &&
+	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
+		mdelay(20);
+
 	/* Marantz/Denon devices with USB DAC functionality need a delay
 	 * after each class compliant request
 	 */

Patches currently in stable-queue which might be from [email protected] are

queue-4.3/alsa-usb-audio-fix-teac-ud-501-ud-503-nt-503-usb-delay.patch