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[ALSA] pcm-midlevel: Add more strict buffer position checks based on jiffies

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Some drivers like Intel8x0 or Intel HDA are broken for some hardware variants.
This patch adds more strict buffer position checks based on jiffies when
internal hw_ptr is updated. Enable xrun_debug to see mangling of wrong
positions.

As a side effect, the hw_ptr interrupt update routine might do slightly better
job when many interrupts are lost.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela
2009-04-10 12:28:58 +02:00
parent fa00e046b4
commit bbf6ad1399
2 changed files with 41 additions and 9 deletions
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3
include/sound/pcm.h
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@@ -268,7 +268,8 @@ struct snd_pcm_runtime {
int overrange;
snd_pcm_uframes_t avail_max;
snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/
snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
/* -- HW params -- */
snd_pcm_access_t access; /* access mode */