[alsa-devel] [PATCH 0/2] ASoC: pcm512x: Add knobs to allow and control overclocking

[Mark Brown]

On Mon, Feb 16, 2015 at 10:02:45PM +0100, Peter Rosin wrote:

> Another "feature" that one might want, is that attempts to change the
> overclocking should fail with EBUSY when the device is already in use.
> But I haven't invested enough time to find out how I should determine
> when to fail, so for this version the driver accepts the change but
> doesn't enforce the new limit until the clock rates are recalculated.

You should be able to to check for the bias level being set to ON.
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