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| author | Ingo Molnar <mingo@kernel.org> | 2013-12-19 16:56:10 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-12-19 16:56:10 +0400 |
| commit | 3331e924e7c5b98d245531b181551cb2a7380d0e (patch) | |
| tree | 25c4432afd79bedc1e8941415166a5cef0c168fb /sound/usb/endpoint.c | |
| parent | fd8526ad14c182605e42b64646344b95befd9f94 (diff) | |
| parent | 319e2e3f63c348a9b66db4667efa73178e18b17d (diff) | |
| download | linux-3331e924e7c5b98d245531b181551cb2a7380d0e.tar.xz | |
Merge tag 'v3.13-rc4' into x86/mm
Pick up the latest fixes before applying new patches.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'sound/usb/endpoint.c')
| -rw-r--r-- | sound/usb/endpoint.c | 16 |
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, 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; |