Gitweb: http://git.kernel.org/linus/160389c8d21c8139a93191c2e5ca2273f311ed4e
Commit: 160389c8d21c8139a93191c2e5ca2273f311ed4e
Parent: 4d788e040b72d2a46ea3ba726b7fa0b65de06c88
Author: Clemens Ladisch <clemens@ladisch.de>
AuthorDate: Mon Jan 26 08:10:19 2009 +0100
Committer: Takashi Iwai <tiwai@suse.de>
CommitDate: Mon Jan 26 17:05:10 2009 +0100
sound: usb-audio: make URB sizes more equal
Distribute the packets evenly among the URBs, instead of making all URBs
except the last one to have the maximum size. This makes the timing of
pointer updates more regular and removes some special cases from the
code.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/usb/usbaudio.c | 29 +++++------------------------
1 files changed, 5 insertions(+), 24 deletions(-)
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index f3d4de2..44485b2 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -1035,9 +1035,9 @@ static void release_substream_urbs(struct snd_usb_substream *subs, int force)
static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int period_bytes,
unsigned int rate, unsigned int frame_bits)
{
- unsigned int maxsize, n, i;
+ unsigned int maxsize, i;
int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
- unsigned int npacks[MAX_URBS], urb_packs, total_packs, packs_per_ms;
+ unsigned int urb_packs, total_packs, packs_per_ms;
/* calculate the frequency in 16.16 format */
if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
@@ -1109,31 +1109,11 @@ static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int peri
/* too much... */
subs->nurbs = MAX_URBS;
total_packs = MAX_URBS * urb_packs;
- }
- n = total_packs;
- for (i = 0; i < subs->nurbs; i++) {
- npacks[i] = n > urb_packs ? urb_packs : n;
- n -= urb_packs;
- }
- if (subs->nurbs <= 1) {
+ } else if (subs->nurbs < 2) {
/* too little - we need at least two packets
* to ensure contiguous playback/capture
*/
subs->nurbs = 2;
- npacks[0] = (total_packs + 1) / 2;
- npacks[1] = total_packs - npacks[0];
- } else if (npacks[subs->nurbs-1] < MIN_PACKS_URB * packs_per_ms) {
- /* the last packet is too small.. */
- if (subs->nurbs > 2) {
- /* merge to the first one */
- npacks[0] += npacks[subs->nurbs - 1];
- subs->nurbs--;
- } else {
- /* divide to two */
- subs->nurbs = 2;
- npacks[0] = (total_packs + 1) / 2;
- npacks[1] = total_packs - npacks[0];
- }
}
/* allocate and initialize data urbs */
@@ -1141,7 +1121,8 @@ static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int peri
struct snd_urb_ctx *u = &subs->dataurb[i];
u->index = i;
u->subs = subs;
- u->packets = npacks[i];
+ u->packets = (i + 1) * total_packs / subs->nurbs
+ - i * total_packs / subs->nurbs;
u->buffer_size = maxsize * u->packets;
if (subs->fmt_type == USB_FORMAT_TYPE_II)
u->packets++; /* for transfer delimiter */
--
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