From mboxrd@z Thu Jan 1 00:00:00 1970 From: wxt@rock-chips.com (Caesar Wang) Date: Fri, 5 Jun 2015 12:47:56 +0800 Subject: [PATCH 2/3] ARM: rockchip: ensure CPU to enter WIF state In-Reply-To: <1433479677-18086-1-git-send-email-wxt@rock-chips.com> References: <1433479677-18086-1-git-send-email-wxt@rock-chips.com> Message-ID: <1433479677-18086-3-git-send-email-wxt@rock-chips.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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