Re: [PATCH 2/3] ASoC: wm8940: Rewrite code to set proper clocks

[Mark Brown <broonie@kernel.org>]

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On Tue, Jun 07, 2022 at 02:13:09PM +0200, Lukasz Majewski wrote:
> > On Mon, Jun 06, 2022 at 05:44:40PM +0200, Lukasz Majewski wrote:

> > I don't entirely follow the above - in what way might the core adjust
> > the clocking, and why would we want to allow the use of invalid
> > clocks? Surely that just makes error checking worse.

> Hmm, it is a bit complicated.

> When I enabed wm8940 support in mainline - the first call to
> wm8940_set_dai_sysclk (the set_sysclk callback) required mclk = 11997070
> frequency.

> With the current code [1] the initialization of the codec returns
> -EINVAL and the codec is not supported in the system:

> asoc-simple-card: probe of sound failed with error -22

Well, that looks like a bug in either simple-card or it's configuration
which should be fixed then (you should probably use audio-graph-card for
new things BTW).  If a machine driver just randomly sets a clock rate
that the system can't support and doesn't want then that's a problem,
presuambly it's getting that rate from somewhere.  Note that this is the
machine driver trying to set a clock rate, not the core.

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