Re: [RESEND PATCH] ARM: dts: make arch-timer always on in rk3288 soc
From: Huang Tao
Date: Thu Aug 28 2014 - 23:07:20 EST
å 2014å08æ28æ 23:11, Mark Rutland åé:
> To clarify: if there are low power states that the CPU can enter where
> we lose state, then this patch isn't correct.
Right now, the software of RK3288 SoC only support CPU hotplug
(cpu_on/off) and power off all CPUs on suspend.
We do not implement cpuidle to power off CPU. Do you think we should
introduce a broadcast timer?
On our early kernel, I never see any interrupt on a broadcast timer
(yes, we implement it with a external timer).
> A more general approach would be to enable the broadcast hrtimer for
> arm, as has been done for arm64.
Yes. I think it should be done by arm framework.
> See commit 5d1638acb9f6 (tick: Introduce hrtimer based broadcast) which
> introduced the broadcast hrtimer, and commit 9358d755bd5c (arm64:
> kernel: initialize broadcast hrtimer based clock event device) which
> added the requisite plumbing for arm64.
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