[alsa-devel] [PATCH 2/2] ASoC: samsung: Use ASoC dmaengine code where possible

Mark Brown broonie at kernel.org
Wed Nov 27 16:05:34 CET 2013

On Wed, Nov 27, 2013 at 06:08:47PM +0530, Padma Venkat wrote:
> On Tue, Nov 26, 2013 at 5:50 PM, Mark Brown <broonie at kernel.org> wrote:

> > So this is 16 bit stereo or something, and did it work beforehand?  Like
> > I say I suspect the DMA is ending up being configured with the wrong
> > transfer size, can you check what actually happens there please - what's
> > different about the configuration that the DMA controller gets?  I don't
> > have any Exynos systems with mainline audio support so I can't test
> > anything myself.

> This stream was working before. dma_size in i2s_hw_params not getting
> effected as dma_data is getting initialized only at dai probe time. So
> by default the dma_size is always 4 which is initialized at driver
> probe time. The fifo_size of dai is also always 0. It is not getting
> passed from dai driver. I just hard coded the dma_size to 2 and

But if it's initialised at probe time then when is it getting
overwritten?  This must be something triggered by DT which unfortunately
I can't test.  It's a bit of a shame that the flows are different
between the DT and non-DT cases.

The FIFO size looks like a difference between the pl330 and pl080, it
doesn't seem to matter for pl080.  We just need to set it though.

> fifo_size to 32 then I can hear the audio only on right ear phone.
> Still underrun error message appears.

Are you sure that dma_size should be 2?  The i2s DAI driver seems to be
hard coding it to 4.
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