diff options
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/usbaudio.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c index 8298c462c29..9e38d3d1322 100644 --- a/sound/usb/usbaudio.c +++ b/sound/usb/usbaudio.c @@ -97,7 +97,7 @@ MODULE_PARM_DESC(async_unlink, "Use async unlink mode."); #define MAX_PACKS 10 #define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */ -#define MAX_URBS 5 /* max. 20ms long packets */ +#define MAX_URBS 8 #define SYNC_URBS 4 /* always four urbs for sync */ #define MIN_PACKS_URB 1 /* minimum 1 packet per urb */ @@ -920,10 +920,12 @@ static int init_substream_urbs(snd_usb_substream_t *subs, unsigned int period_by else subs->curpacksize = maxsize; - if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) + if (is_playback) urb_packs = nrpacks; else - urb_packs = (nrpacks * 8) >> subs->datainterval; + urb_packs = 1; + if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) + urb_packs = (urb_packs * 8) >> subs->datainterval; /* allocate a temporary buffer for playback */ if (is_playback) { @@ -935,9 +937,13 @@ static int init_substream_urbs(snd_usb_substream_t *subs, unsigned int period_by } /* decide how many packets to be used */ - total_packs = (period_bytes + maxsize - 1) / maxsize; - if (total_packs < 2 * MIN_PACKS_URB) - total_packs = 2 * MIN_PACKS_URB; + if (is_playback) { + total_packs = (period_bytes + maxsize - 1) / maxsize; + if (total_packs < 2 * MIN_PACKS_URB) + total_packs = 2 * MIN_PACKS_URB; + } else { + total_packs = MAX_URBS * urb_packs; + } subs->nurbs = (total_packs + urb_packs - 1) / urb_packs; if (subs->nurbs > MAX_URBS) { /* too much... */ |