On Wed, May 14, 2014 at 5:37 PM, Tushar Behera <tushar.beh...@linaro.org> wrote: > On 14 May 2014 17:29, Jassi Brar <jassisinghb...@gmail.com> wrote: >> On Wed, May 14, 2014 at 8:53 AM, Tushar Behera <tushar.beh...@linaro.org> >> wrote: >>> While playing back audio, pmc_dmaengine requests the DMA channel to >>> stop DMA transmission through DMA_PAUSE command. >>> >>> Currently PL330 driver doesn't support DMA pause command, leaving >>> the DMA state inconsistent when the system resumes. Instead, it would >>> be better to terminate the DMA transfer during suspend and restart >>> again during resume. >>> >>> Tested with audio playback across a suspend-resume cycle. >>> >> What is pmc_dmaengine? How does DMA_PAUSE help, when there is no DMA_RESUME? >> > > Sorry, it is a typo. > > sound/core/pcm_dmaengine.c:snd_dmaengine_pcm_trigger() --> > dmaengine_pause() is called during system suspend. > pl330.c does specify cmd_pause = false, which should prevent sound/soc/soc-generic-dmaengine-pcm.c:dmaengine_pcm_set_runtime_hwparams() from declaring PAUSE/RESUME support. Which kernel are you using?
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