[alsa-devel] [PATCH V2 5/9] Main rewite of the mpc5200 audio DMA code

Mark Brown broonie at opensource.wolfsonmicro.com
Mon May 25 12:51:40 CEST 2009

On Mon, May 25, 2009 at 09:56:27AM +0200, Juergen Beisert wrote:

> Do you know this (from our website)?

> "The AC97 mixer needs a hardware patch to make it wake up from power down 
> mode. Download here the instruction how to do so."

> http://www.pengutronix.de/oselas/bsp/phytec/download/phyCORE-MPC5200B-tiny/TN-015e_1.pdf

This modification should not be required - a warm reset should be enough
to bring the AC97 link up.  The current ASoC driver for the WM9712 will
do this automatically - the expectation for non-ASoC systems is that the
warm reset will always be issued.

That said, I'd be surprised if it were the same problem given that
iterating cold resets appears to resolve whatever the issues is.

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