From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Liam Girdwood <lrg@ti.com>
Cc: alsa-devel@alsa-project.org, patches@opensource.wolfsonmicro.com
Subject: Re: [PATCH] ASoC: Provide a more complete DMA driver stub
Date: Mon, 5 Dec 2011 23:19:46 +0000 [thread overview]
Message-ID: <20111205231946.GB21083@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <1323122570.8134.1.camel@odin>
On Mon, Dec 05, 2011 at 10:02:50PM +0000, Liam Girdwood wrote:
> On Mon, 2011-12-05 at 20:56 +0000, Mark Brown wrote:
> > Allow userspace applications to do more parameter setting by providing a
> > more complete stub DMA driver specifying a wildcard set of formats and
> > channels and essentially random values for the DMA parameters. This is
> > required for useful runtime operation of the dummy DMA driver until we
> > are able to figure out how to power up links and do hw_params() from DAPM.
> Is this also intended to be used for hostless DAI links e.g.
> MODEM <-> MCBSP <-> DSP
It's for any sort of link that doesn't go through a DMA controller the
kernel can see - this is the DMA driver that gets stubbed in when the
DAI doesn't have a DMA driver. In the case above I guess it depends on
if the DMA controller is hidden by the DSP or not.
next prev parent reply other threads:[~2011-12-05 23:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-05 20:56 [PATCH] ASoC: Provide a more complete DMA driver stub Mark Brown
2011-12-05 22:02 ` Liam Girdwood
2011-12-05 23:19 ` Mark Brown [this message]
2011-12-06 13:32 ` Girdwood, Liam
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