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

From: Daniel Mack
Date: Mon Feb 16 2015 - 06:23:54 EST

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

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?


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