[alsa-devel] [PATCH 10/11] ASoC: tegra: Harmony machine support

Mark Brown broonie at opensource.wolfsonmicro.com
Tue Jan 4 16:30:20 CET 2011

On Mon, Jan 03, 2011 at 11:39:32AM -0800, Stephen Warren wrote:
> Mark Brown wrote:

> > It might be interesting to try having the CODEC master the I2S bus - it
> > might not change anything, but it sometimes shows up if one of the clock
> > lines is misconfigured.

> Having the codec be master of the bit and frame clocks appears to completely
> solve the noise issues. I do notice that different sample rates play the same
> audio at different pitches though, so something is still wrong, but it's most
> likely to be incorrect codec MCLK input right now; I'll keep investigating...

That's progress; with the CODEC as master all the clocks within the
CODEC will be configured correctly in relation to one another which will
help with the noise - probably the MCLK rate does have issues like you
say, with the CODEC as master pitch variations are a likely symptom.

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