ASoC: dmaengine-pcm: Rename and deprecate snd_dmaengine_pcm_pointer
authorLars-Peter Clausen <lars@metafoo.de>
Mon, 11 Jun 2012 18:11:41 +0000 (20:11 +0200)
committerMark Brown <broonie@opensource.wolfsonmicro.com>
Wed, 20 Jun 2012 14:38:32 +0000 (15:38 +0100)
commit9883ab229d61b884323f9186b1bd4a41373a491b
tree9e39d508d1e4b7415b5c08aca362fd15a9bcfa68
parentc32c44cb58d212513243744878423abd207bc8a8
ASoC: dmaengine-pcm: Rename and deprecate snd_dmaengine_pcm_pointer

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@metafoo.de>
Acked-by Vinod Koul <vinod.koul@linux.intel.com>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
include/sound/dmaengine_pcm.h
sound/soc/ep93xx/ep93xx-pcm.c
sound/soc/fsl/imx-pcm-dma.c
sound/soc/mxs/mxs-pcm.c
sound/soc/soc-dmaengine-pcm.c
sound/soc/ux500/ux500_pcm.c