linux-kernel - Re: [PATCH RFC 2/2] ARM: pxa: transition to dmaengine phase 1

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Message-ID: <54E1D342.7090005@zonque.org>
Date:	Mon, 16 Feb 2015 12:23:46 +0100
From:	Daniel Mack <daniel@...que.org>
To:	Vasily Khoruzhick <anarsoul@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>
CC:	Vinod Koul <vinod.koul@...el.com>, Arnd Bergmann <arnd@...db.de>,
	Olof Johansson <olof@...om.net>,
	Daniel Mack <zonque@...il.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	dmaengine@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	arm-linux <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH RFC 2/2] ARM: pxa: transition to dmaengine phase 1

On 02/16/2015 12:14 PM, Vasily Khoruzhick wrote:
> What about dropping old PXA DMA code completely? Daniel Mack did port
> for most of PXA drivers to dma engine,
> I've rebased his patches against 3.17 several months ago and fixed
> oopses in pxamci and asoc drivers, but I didn't resubmit whole series
> due to lack of time.

Yes, I did the same locally.

> My 3.17 tree is at [1], I've tested it on pxa270 machine (Zipit Z2),
> and everything works fine so far. I guess it won't be too much work to
> rebase it against linux-3.20.

Rebasing is easy, but there's more to that. We should at least try to
convert all drivers over to dmaengine, otherwise they will just stop
working.

The biggest problem that I currently see is the pxa camera driver, which
also uses an advanced way of descriptor hot-linking at runtime. Last
time I checked, this wasn't possible to achieve with the dma-slave API.
Hence, this driver might need to be completely rewritten, which only
someone with such hardware at hand can work on. Maybe the cyclic DMA
support in mmp-dma already suffices for that. Robert, weren't you
already working on that?

Thanks,
Daniel

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