GSoC 2014 #2 status report - Improving Allwinner SoC support

Hi Emilio,

On Mon, Aug 04, 2014 at 06:25:47PM -0300, Emilio L?pez wrote:

Hi everyone,

Here's a status update on my GSoC project for these last two weeks;
you can find the two previous updates on the list archives[0][1]

First of all, I have started to prepare for university exams, so
that has taken some of the time I was using to work on the project.
I have not stopped working on this though - you will still see
progress and receive some more of these emails :)

On the sound side, we now have normal volume 24 bit audio after
Chen-Yu noticed it was an alignment problem and that we could get
around it by using S32LE with 24 significant bits. I have also been
working on rewriting the driver to use DAPM, and I can now manage
several parts of the codec with it already. If no further obstacles
show up, I expect to get it completed soon and in shape for a
initial submission before the end of GSoC.

When I was working on this, this script from Arnaud Patard helped me a
lot to debug the DAPM states:
http://code.bulix.org/ps99ew-86717

During this period I also sent some patches for the clock support we
need for the codec and other audio blocks. I firstly did a RFC[2],
as the PLL2 is different on the A10 revision A, and we'd need some
sort of quirk handling for that. After settling for a DT-based
handling, I sent a refreshed series implementing it[3], which is
currently under review. This quirk handling is also going to be
needed for the codec driver, as there's a couple of quirks there as
well.

I've also sent an updated version[4] of the DMA engine driver
addressing the comments I got on v2 and including the performance
and cyclic improvements I mentioned on the previous report - they
say third time's the charm, so hopefully I can get a review from the
DMA maintainers this round :)

You can expect the next status report in about a week's time. There
are two GSoC weeks remaining until the hard deadline, so that leaves
time for another weekly report and a wrap-up one.

Thanks a lot for this report, I'm eagerly waiting for the followups :)

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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