linux-kernel - Re: [RFC 1/2] ASoC: dmaengine-pcm: Add support for querying DMA capabilities

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Date:	Mon, 15 Jul 2013 22:27:21 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/2] ASoC: dmaengine-pcm: Add support for querying DMA
 capabilities

On Mon, Jul 15, 2013 at 06:26:43PM +0100, Mark Brown wrote:
> On Mon, Jul 15, 2013 at 06:42:10PM +0200, Lars-Peter Clausen wrote:
> 
> > +	hw.period_bytes_min = 16;
> > +	hw.period_bytes_max = dma_caps.max_sg_len;
> 
> We can't read the minimum period size from dmaengine? Seems like
> something might have a restriction other than 16 bytes here.
max would be how many list items the engine supports so queried therotical min
would be 1 byte, not sure how 16 bytes is assumed above but my guess is that if
engine is able to push min burst lengths which would be 1 and give you
interrupt. But seriously, that would not be practical. So this should be a
realistic limit which system can cope with.

~Vinod

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