From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vinod Koul <vinod.koul@intel.com>
Subject: Re: [RFC 1/2] ASoC: dmaengine-pcm: Add support for querying DMA
 capabilities
Date: Mon, 15 Jul 2013 22:27:21 +0530
Message-ID: <20130715165721.GV16653@intel.com>
References: <1373906531-6938-1-git-send-email-lars@metafoo.de>
 <20130715172643.GZ11538@sirena.org.uk>
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In-Reply-To: <20130715172643.GZ11538@sirena.org.uk>
Sender: linux-kernel-owner@vger.kernel.org
To: Mark Brown <broonie@kernel.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>, Liam Girdwood <lgirdwood@gmail.com>, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org
List-Id: alsa-devel@alsa-project.org


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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:
>=20
> > +	hw.period_bytes_min =3D 16;
> > +	hw.period_bytes_max =3D dma_caps.max_sg_len;
>=20
> 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 tha=
t 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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