Messages in this thread | | | Date | Fri, 29 Aug 2014 11:06:40 +0800 | From | Huang Tao <> | Subject | Re: [RESEND PATCH] ARM: dts: make arch-timer always on in rk3288 soc |
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Hi, Mark:
在 2014年08月28日 23:11, Mark Rutland 写道: > 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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