Re: i810 audio patch

Nathan Bryant
2001-12-05T23:51:51Z

Doug Ledford wrote:

> Can you add a debug check to update_lvi()? Something like:
>
> #ifdef DEBUG_MMAP
> if (dmabuf->count > dmabuf->fragsize && inb(port+OFF_CIV) == x)
> printk(KERN_DEBUG,"i810_audio: update_lvi - CIV ==
> LVI\n");
> #endif
>
> and see if that triggers with the original mmap code?

I've narrowed it down a little more.. the above does not trigger. but
i've added some other printk's and the sequence of events goes like this:

open, mmap
SETTRIGGER : works properly with the resync_dma removed; count
initialized to 65536
we take 6 interrupts; 4 comp + lvi + dch; count drains to 0 properly
[quake finishes initializing]
GETOPTR:
at the beginning of the call, count is 0; by the end of the call, count
has been set to 64K

but, we take no interrupts after this point.