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@@ -636,8 +636,22 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
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if (usb_pipein(ep->pipe) ||
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snd_usb_endpoint_implicit_feedback_sink(ep)) {
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+ urb_packs = packs_per_ms;
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+ /*
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+ * Wireless devices can poll at a max rate of once per 4ms.
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+ * For dataintervals less than 5, increase the packet count to
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+ * allow the host controller to use bursting to fill in the
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+ * gaps.
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+ */
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+ if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) {
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+ int interval = ep->datainterval;
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+ while (interval < 5) {
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+ urb_packs <<= 1;
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+ ++interval;
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+ }
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+ }
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/* make capture URBs <= 1 ms and smaller than a period */
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- urb_packs = min(max_packs_per_urb, packs_per_ms);
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+ urb_packs = min(max_packs_per_urb, urb_packs);
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while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
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urb_packs >>= 1;
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ep->nurbs = MAX_URBS;
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