在 2015年06月08日 17:28, Russell King - ARM Linux 写道:
On Mon, Jun 08, 2015 at 03:11:35PM +0800, Caesar Wang wrote:diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c index bd40852..5bc2a89 100644 --- a/arch/arm/mach-rockchip/platsmp.c +++ b/arch/arm/mach-rockchip/platsmp.c @@ -321,6 +321,9 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus) #ifdef CONFIG_HOTPLUG_CPU static int rockchip_cpu_kill(unsigned int cpu) { + /* ensure CPU can enter the WFI/WFE state */I would like to see a better comment here, describing what the problem is. Maybe something like this: /* * We need a delay here to ensure that the dying CPU can finish * executing v7_coherency_exit() and reach the WFI/WFE state * prior to having the power domain disabled. */ Thanks.
OK, Thanks!
+ mdelay(1); + pmu_set_power_domain(0 + cpu, false); return 1; } -- 1.9.1
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