linux-kernel - Re: [PATCH 12/18] ARM: s3c64xx: Add support for DMA using generic amba-pl08x driver

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Message-ID: <20130813203536.GI6427@sirena.org.uk>
Date:	Tue, 13 Aug 2013 21:35:36 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Tomasz Figa <tomasz.figa@...il.com>
Cc:	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
	Dan Williams <djbw@...com>, Jaroslav Kysela <perex@...ex.cz>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mike Turquette <mturquette@...aro.org>,
	Padmavathi Venna <padma.v@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Sangbeom Kim <sbkim73@...sung.com>,
	Takashi Iwai <tiwai@...e.de>, Vinod Koul <vinod.koul@...el.com>
Subject: Re: [PATCH 12/18] ARM: s3c64xx: Add support for DMA using generic
 amba-pl08x driver

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.

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