8 Aug
2008
8 Aug
'08
7:58 a.m.
At Thu, 07 Aug 2008 13:51:55 -0500, Timur Tabi wrote:
In my _pointer callback function, I have this:
printk(KERN_INFO "%s:%u substream->pcm->dev=%p, substream->pcm->card->dev=%p\n", __func__, __LINE__, substream->pcm->dev, substream->pcm->card->dev);
During playback, it displays this:
fsl_dma_pointer:698 substream->pcm->dev=00000000, substream->pcm->card->dev=dfa50a08
Why is substream->pcm->dev == NULL? What's the point of having this field if you're not going to use it?
It's provided to use a different device for PCM than card->dev. An example is found in AOA drivers.
Takashi