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    SubjectRe: i810 audio patch
    Nathan Bryant wrote:

    > Actually, I think I *may* have found the problem, in update ptr, it
    > should look like this: going to test in a moment
    > /* error handling and process wake up for DAC */
    > if (dmabuf->enable == DAC_RUNNING) {
    > /* update hardware pointer */
    > hwptr = i810_get_dma_addr(state, 0);
    > diff = hwptr - dmabuf->hwptr;
    > if (hwptr < dmabuf->hwptr)
    > diff += dmabuf->dmasize;

    This is mathematically equivelant to what was already there.

    > #if defined(DEBUG_INTERRUPTS) || defined(DEBUG_MMAP)
    > printk("DAC HWP %d,%d,%d\n", hwptr, dmabuf->hwptr, diff);
    > #endif
    > reason: hwptr hits 65536 which is indistinguishable from 0 in mod
    > arithmetic

    The mod doesn't happen until all the rest is already done, and then it's
    just cancelling out the dmabuf->dmasize portion (instead of using an if
    statement to do the same thing).

    > also, I ran your other DEBUG_MMAP patch and the news is that count just
    > sits at 65536 ad nauseum.

    Yes, but if I have the stuff leading up to it sitting at 65536 forever I
    might be able to diagnose the problem (without installing quake myself
    and taking the time to set it up anyway) ;-)


    Doug Ledford <>
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