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    Subject[PATCH 4.2.y-ckt 38/64] ALSA: usb-audio: Fix TEAC UD-501/UD-503/NT-503 usb delay
    Date
    4.2.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

    ---8<------------------------------------------------------------

    From: Guillaume Fougnies <guillaume@eulerian.com>

    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@eulerian.com>
    Signed-off-by: Takashi Iwai <tiwai@suse.de>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    sound/usb/quirks.c | 14 +++++++++++++-
    1 file changed, 13 insertions(+), 1 deletion(-)

    diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
    index fb9a8a5..5585cfd 100644
    --- a/sound/usb/quirks.c
    +++ b/sound/usb/quirks.c
    @@ -1202,8 +1202,12 @@ void snd_usb_set_interface_quirk(struct usb_device *dev)
    * "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_device *dev, unsigned int pipe,
    (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
    */
    --
    1.9.1
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