[PATCH v2 2/6] ASoC: xilinx: xlnx_formatter_pcm: Handle sysclk setting

[Mark Brown]

On Fri, Jan 07, 2022 at 03:47:07PM -0600, Robert Hancock wrote:
> This driver did not set the MM2S Fs Multiplier Register to the proper
> value for playback streams. This needs to be set to the sample rate to
> MCLK multiplier, or random stream underflows can occur on the downstream
> I2S transmitter.
> 
> Store the sysclk value provided via the set_sysclk callback and use that
> in conjunction with the sample rate in the hw_params callback to calculate
> the proper value to set for this register.

The driver should be setting a constraint for this if the sysclk is
configured, we shouldn't end up in a situation where userspace is trying
to start a playback that will fail.
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