Re: [PATCH] ARM: EXYNOS: mcpm: Don't rely on firmware's secondary_cpu_start

[Nicolas Pitre]

On Tue, 10 Jun 2014, Doug Anderson wrote:

> My S-state knowledge is not strong, but I believe that Lorenzo's
> questions matter if we're using S2 for CPUidle (where we actually turn
> off power and hot unplug CPUs) but not when we're using S1 for CPUidle
> (where we just enter WFI/WFE).
> 
> I believe that in ChromeOS we use S1 CPUidle and that it works fine.
> We've never implemented S2 that I'm aware of.

You'll have to rely on MCPM for that.  That's probably why it hasn't 
been implemented before.


Nicolas
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