[alsa-devel] [PATCH v2] ASoC: Intel: Add Cherrytrail & Braswell machine driver cht_bsw_rt5672

[Mark Brown]

On Fri, Oct 31, 2014 at 12:48:26PM +0000, Lin, Mengdong wrote:

> Now we're working with Realtek to enable runtime PM on RT5672 codec driver.
> With help of ACPI, 
> - the codec will be in suspended to D3 when idle , switch to its internal clock, 
>  and BIOS will turn off the platform clock output (MCLK) to save power.
> - And when the codec resumes to D0, BIOS will turn on the clock at first. And 
>  hw_params will make the codec use PLL and lock to MCLK again.

> Thus the machine driver does not need to explicitly turn on/off the platform 
> codec by itself.

If the machine driver has asked for the PLL to be on I'd expect the
CODEC driver to be respecting that...
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