On Mon, Jan 5, 2015 at 1:12 PM, Michael Tessier
[off-list ref] wrote:

If sound is ok when using only 1 codec and becomes choppy when adding a
second codec, then it means that this issue is still in the 3.x kernel. This
answer will tell me if it is worth working on using a newer kernel or not.
I have to say that I'm not a linux expert, so I see the migration to a newer
kernel as a quite big amount of work...

We have support for mx51 on the latest kernel. All you need to do is
to describe your hardware on a device tree file. You can refer to
arch/arm/boot/dts/imx51-babbage.dts as an example.

Should be simple for you to make such test with the latest kernel.