From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kuninori Morimoto <kuninori.morimoto.gx@gmail.com>
Subject: Re: About snd_dmaengine_pcm_trigger()
Date: Mon, 10 Mar 2014 21:47:20 -0700 (PDT)
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To: Lars-Peter Clausen <lars@metafoo.de>
Cc: Linux-ALSA <alsa-devel@alsa-project.org>, Simon <horms@verge.net.au>, Mark Brown <broonie@kernel.org>, Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>, Liam Girdwood <lgirdwood@gmail.com>
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Hi Lars, Mark

> Make them ASoC components ;) I don't know the hardware, but looking at the 
> code it doesn't seem to be that different from other modern host side audio 
> processing units. But one step at a time, first maybe try and see if you can 
> switch over to using the dmaengine PCM helper functions. Then later thing 
> about how this all can be better integrated into the ASoC framework.

In my quick check,
I guess, my drivers (FSI/rcar) can use 
${LINUX}/sound/core/pcm_dmaengine.c methods as 1st step.

OTOH, these drivers has PIO transfer too.
So, if ALSA has PIO method like pcm_pio.c (?) which has similar method,
it seems easy to switch over.
But what do you think ?

Best regards
---
Kuninori Morimoto