[PATCH 00/20] ARM: pxa: move core and drivers to dmaengine

Arnd Bergmann arnd at arndb.de
Wed Aug 7 12:08:51 EDT 2013

On Wednesday 07 August 2013, Daniel Mack wrote:
> I've been working on teaching the mmp-pdma driver more functions and
> porting tree-wide scattered pxa specific drivers over to dmaengine
> implementations. I posted the first round of patches for mmp-pdma here:
>   http://marc.info/?l=linux-arm-kernel&m=137587082530228
> With the following patches applied, I can boot a PXA3xx board boot with
> all DMA runtime information determined from DT, using pxa3xx-nand,
> pxamci and audio components (cyclic DMA).
> However, the transition is quite intrusive and spans across several
> subsystem, and due to the nature of the current pxa DMA implementation,
> it cannot be gap-less. All drivers currently request an exclusive
> channel via code in arch/arm/plat-pxa/dma.c and then do direct register
> modifications regarding their obtained channel. We can't allow this
> with the mmp-pdma driver of course, and I also have no idea how to
> provide sane stubs for the existing hooks which end up in dmaengine
> calls.
> Hence, all drivers have to be ported over in one series, and all these
> changes should be merged by one pull request eventually in order to
> prevent both build and functional breakage. Haojian's repository seems
> most suitable for that, as he's the PXA maintainer.

Very nice series! I just looked over these and only found a few minor details
that could be improved.


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