Messages in this thread | | | Date | Wed, 14 May 2014 17:29:05 +0530 | Subject | Re: [PATCH] dma: pl330: Add support for DMA_PAUSE command | From | Jassi Brar <> |
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On Wed, May 14, 2014 at 8:53 AM, Tushar Behera <tushar.behera@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?
DMA_PAUSE means freezing the transfer, not dropping it. DMA_RESUME then moves the transfer again from that point. Clubbing PAUSE with TERMINATE is plain wrong. Sorry.
Regards Jassi
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