Messages in this thread | | | Date | Tue, 10 Jun 2014 11:49:27 -0400 (EDT) | From | Nicolas Pitre <> | Subject | Re: [PATCH] ARM: EXYNOS: mcpm: Don't rely on firmware's secondary_cpu_start |
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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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