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| author | Ingo Molnar <[email protected]> | 2014-01-05 11:34:29 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2014-01-05 11:34:29 +0000 |
| commit | ef0b8b9a521c65201bfca9747ee1bf374296133c (patch) | |
| tree | 644c3390c07d06fb7807182a4935f7c3f675b157 /sound/usb/endpoint.c | |
| parent | x86/efi: parse_efi_setup() build fix (diff) | |
| parent | Linux 3.13-rc7 (diff) | |
| download | kernel-ef0b8b9a521c65201bfca9747ee1bf374296133c.tar.gz kernel-ef0b8b9a521c65201bfca9747ee1bf374296133c.zip | |
Merge tag 'v3.13-rc7' into x86/efi-kexec to resolve conflicts
Conflicts:
arch/x86/platform/efi/efi.c
drivers/firmware/efi/Kconfig
Signed-off-by: Ingo Molnar <[email protected]>
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; |