31 Oct
2014
31 Oct
'14
1:54 p.m.
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...