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

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>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 8904b1900d7f..c17296891617 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -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 */