[alsa-devel] [PATCH 12/18] ARM: s3c64xx: Add support for DMA using generic amba-pl08x driver

Mark Brown broonie at kernel.org
Tue Aug 13 22:35:36 CEST 2013

On Tue, Aug 13, 2013 at 01:10:02PM -0700, Tomasz Figa wrote:
> On Tuesday 13 of August 2013 18:52:51 Mark Brown wrote:

> > On Sun, Aug 11, 2013 at 07:59:24PM +0200, Tomasz Figa wrote:
> > > +#define pl330_filter pl08x_filter_id

> > So, this is pretty fun and probably not going to play too nicely for
> > multiplatform kernels...

> Yes, this is really funny and only shows the brokenness of current channel 
> filtering mechanism used in DMA engine subsystem. Fortunately this is 
> quite irrelevant to multiplatform kernels, because no users of it will be 
> compiled in, since it's used only for legacy (non-DT) channel filtering.

Well, the thing here is more about the fact that the match function is
silently being hijacked - it should be possible to do this in the device
registrations.  I'd expect you could get a non-DT kernel which was
affected, but you'd probably have to try.

> Anyway, I would happily redesign and rewrite the DMA engine channel 
> matching completely to make it much more sane, but I guess I would need an 
> ack from Vinod and Dan to do it.

I'd be really keen to get this code merged sooner rather than later for
ASoC development so if there's a way to do it separately to fixing the
filtering that'd be good.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: Digital signature
URL: <http://mailman.alsa-project.org/pipermail/alsa-devel/attachments/20130813/4120754f/attachment-0001.sig>

More information about the Alsa-devel mailing list