On 05/14/2014 02:07 PM, Tushar Behera wrote:
On 14 May 2014 17:29, Jassi Brar <jassisinghbrar@xxxxxxxxx> wrote:
On Wed, May 14, 2014 at 8:53 AM, Tushar Behera <tushar.behera@xxxxxxxxxx> 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.
It is only called if the DMA driver has support for pausing and resuming DMA
transfers. Or at least that is the intention.
- Lars
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