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-rw-r--r--sound/usb/endpoint.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index b9ba0fcc45df..83aabea259d7 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,
636 if (usb_pipein(ep->pipe) || 636 if (usb_pipein(ep->pipe) ||
637 snd_usb_endpoint_implicit_feedback_sink(ep)) { 637 snd_usb_endpoint_implicit_feedback_sink(ep)) {
638 638
639 urb_packs = packs_per_ms;
640 /*
641 * Wireless devices can poll at a max rate of once per 4ms.
642 * For dataintervals less than 5, increase the packet count to
643 * allow the host controller to use bursting to fill in the
644 * gaps.
645 */
646 if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) {
647 int interval = ep->datainterval;
648 while (interval < 5) {
649 urb_packs <<= 1;
650 ++interval;
651 }
652 }
639 /* make capture URBs <= 1 ms and smaller than a period */ 653 /* make capture URBs <= 1 ms and smaller than a period */
640 urb_packs = min(max_packs_per_urb, packs_per_ms); 654 urb_packs = min(max_packs_per_urb, urb_packs);
641 while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) 655 while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
642 urb_packs >>= 1; 656 urb_packs >>= 1;
643 ep->nurbs = MAX_URBS; 657 ep->nurbs = MAX_URBS;