At Tue, 26 Nov 2013 13:58:15 -0600, Thomas Pugliese wrote:

For Wireless USB audio devices, use multiple isoc packets per URB for inbound endpoints with a datainterval < 5. This allows the WUSB host controller to take advantage of bursting to service endpoints whose logical polling interval is less than the 4ms minimum polling interval limit in WUSB.

Signed-off-by: Thomas Pugliese thomas.pugliese@gmail.com

Thanks, applied now.

Takashi

---

sound/usb/endpoint.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index b9ba0fc..83aabea2 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -636,8 +636,22 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep, if (usb_pipein(ep->pipe) || snd_usb_endpoint_implicit_feedback_sink(ep)) {

• urb_packs = packs_per_ms;
  

• /*
  

•  * Wireless devices can poll at a max rate of once per 4ms.
  

•  * For dataintervals less than 5, increase the packet count to
  

•  * allow the host controller to use bursting to fill in the
  

•  * gaps.
  

•  */
  

• if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) {
  

• 	int interval = ep->datainterval;
  

• 	while (interval < 5) {
  

• 		urb_packs <<= 1;
  

• 		++interval;
  

• 	}
  

• }
  

  /* make capture URBs <= 1 ms and smaller than a period */

• urb_packs = min(max_packs_per_urb, packs_per_ms);
  

• urb_packs = min(max_packs_per_urb, urb_packs);
  

  while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) urb_packs >>= 1; ep->nurbs = MAX_URBS;

-- 1.7.10.4

---

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