[alsa-devel] [PATCH v2 2/3] ASoC: dmaengine-pcm: Rename and deprecate snd_dmaengine_pcm_pointer

Vinod Koul vinod.koul at linux.intel.com
Wed Jun 20 12:55:01 CEST 2012

On Mon, 2012-06-11 at 20:11 +0200, Lars-Peter Clausen wrote:
> Currently the sound dmaengine pcm helper functions implement the pcm_pointer
> callback by trying to count the number of elapsed periods. This is done by
> advancing the stream position in the dmaengine callback by one period.
> Unfortunately there is no guarantee that the callback will be called for each
> elapsed period. It may be possible that under high system load it is only called
> once for multiple elapsed periods. This patch renames the current implementation
> and documents its shortcomings and that it should not be used anymore in new
> drivers.
> The next patch will introduce a new snd_dmaengine_pcm_pointer which will be
> implemented based on querying the current stream position from the dma device.
> Signed-off-by: Lars-Peter Clausen <lars at metafoo.de>
Acked-by: Vinod Koul <vinod.koul at intel.com>


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