[alsa-devel] [PATCH] ASoC: Provide a more complete DMA driver stub

[Mark Brown]

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.