mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 01:54:09 +08:00
1b3fd2d342
The current code hardcodes the number of audio URBs, the number of packets per URB and the maximum URB size. This is not a good idea, as it: - wastes more bandwidth than necessary, by using a very large number of packets; - those constants are bound to an specific scenario, with a bandwidth of 48 kHz; - don't take the maximum endpoint size into account; - with urb->interval = 1 on xHCI, those constraints cause a "funny" setup: URBs with 64 packets inside, with only 24 bytes total. E. g. a complete waste of space. Change the code to do dynamic URB audio calculus and allocation. For now, use the same constraints as used before this patch, to avoid regressions. A good scenario (tested) seems to use those defines, instead: #define EM28XX_MAX_AUDIO_BUFS 8 #define EM28XX_MIN_AUDIO_PACKETS 2 But let's not do such change here, letting the optimization to happen on latter patches, after more tests. Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com> |
||
|---|---|---|
| .. | ||
| em28xx-audio.c | ||
| em28xx-camera.c | ||
| em28xx-cards.c | ||
| em28xx-core.c | ||
| em28xx-dvb.c | ||
| em28xx-i2c.c | ||
| em28xx-input.c | ||
| em28xx-reg.h | ||
| em28xx-v4l.h | ||
| em28xx-vbi.c | ||
| em28xx-video.c | ||
| em28xx.h | ||
| Kconfig | ||
| Makefile | ||