[alsa-devel] [PATCH 2/4] ASoC: mmp: add audio dma support

Vinod Koul vinod.koul at linux.intel.com
Tue May 29 07:18:54 CEST 2012

On Tue, 2012-05-29 at 13:14 +0800, zhangfei gao wrote:
> When debugging with putting snd_dmaengine_pcm_open to probe or
> pcm_new, there is issue.
> snd_dmaengine_pcm_open ->
> snd_pcm_hw_constraint_integer(substream->runtime,
> The runtime is only exist at runtime.
> So if using soc-dmaengine, I am afraid the snd_dmaengine_pcm_open has
> to be put in open instead of probe. 
I think you got it wrong, the snd_dmaengine_pcm_open needs to be called
from your CPU pcm_open. See other examples how this is used in other


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