• Lars-Peter Clausen's avatar
    ASoC: dmaengine-pcm: Rename and deprecate snd_dmaengine_pcm_pointer · 9883ab22
    Lars-Peter Clausen authored
    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: default avatarLars-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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
    9883ab22
mxs-pcm.c 5.91 KB