[PATCH 4.4 024/117] ALSA: usb-audio: Fix TEAC UD-501/UD-503/NT-503 usb delay

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guillaume Fougnies <guillaume@xxxxxxxxxxxx>

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.

Signed-off-by: Guillaume Fougnies <guillaume@xxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1205,8 +1205,12 @@ 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,
@@ -1221,6 +1225,14 @@ 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
 	 */