[PATCH 00/20] ARM: pxa: move core and drivers to dmaengine
robert.jarzmik at free.fr
Fri Aug 9 18:50:15 EDT 2013
Daniel Mack <zonque at gmail.com> writes:
> * camera driver:
> I started the transition, but I'm not sure how much sense that
> makes without access to the hardware. I'd much appreciate if
> anyone could volunteer for this piece; I'll happily share what
> I got so far. Sascha, Sachin, Guennadi?
Do you mean this driver ? :
In that case I might help. But before I can do that, I have to be convinced that
dmaengine can deal with this driver. I'm thinking in particular of :
- "hot running DMA" queuing
- multiple DMA channel synchronization (ie. 3 channel sync)
All that is described in there :
If someone with dmaengine knowledge could have a look at pxa_camera.txt (maybe
Vinod ?) and tell me that dma_engine framework fullfills the 2 requirements,
then I'll be happy to help.
One minor point though is that I'm working on pxa27x. If the serie is not
compatible in a way with pxa27x, I won't be able to do anything.
Another point I'd like to know, is what is the performance penalty in using
dmaengine, and do you have any figures ?
Lastly, they was debug information to debug descriptors chaining, channel
statuses, requestors. I didn't see where these had gone, could you point me to
the right file ?
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