[PATCH 2/3] ARM: rockchip: ensure CPU to enter WIF state

Caesar Wang
2015-06-05T04:48:43Z

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 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 1230d3d..978c357 100644
--- a/arch/arm/mach-rockchip/platsmp.c
+++ b/arch/arm/mach-rockchip/platsmp.c
@@ -316,6 +316,9 @@ 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