[PATCH v4 2/3] ARM: rockchip: ensure CPU to enter WFI/WFE state

[Caesar Wang <wxt@rock-chips.com>]

In idle mode, core1/2/3 of Cortex-A17 should be either power off or in
WFI/WFE state.
we can delay 1ms to ensure the CPU enter WFI/WFE state.

Signed-off-by: Caesar Wang <wxt@rock-chips.com>
---

 arch/arm/mach-rockchip/platsmp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
index a297b86..d809fbc 100644
--- a/arch/arm/mach-rockchip/platsmp.c
+++ b/arch/arm/mach-rockchip/platsmp.c
@@ -327,6 +327,9 @@ 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 */
+	mdelay(1);
+
 	pmu_set_power_domain(0 + cpu, false);
 	return 1;
 }
-- 
1.9.1