From mboxrd@z Thu Jan 1 00:00:00 1970 From: Caesar Wang Subject: [PATCH v4 2/3] ARM: rockchip: ensure CPU to enter WFI/WFE state Date: Sat, 6 Jun 2015 01:05:22 +0800 Message-ID: <1433523923-4755-3-git-send-email-wxt@rock-chips.com> References: <1433523923-4755-1-git-send-email-wxt@rock-chips.com> Return-path: In-Reply-To: <1433523923-4755-1-git-send-email-wxt@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org To: Heiko Stuebner Cc: dianders@chromium.org, Dmitry Torokhov , linux-rockchip@lists.infradead.org, Caesar Wang , Russell King , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org List-Id: linux-rockchip.vger.kernel.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/WFE 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 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