From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-x22a.google.com (mail-pd0-x22a.google.com [IPv6:2607:f8b0:400e:c02::22a]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id BF8E72C00AF for ; Sat, 21 Dec 2013 07:47:50 +1100 (EST) Received: by mail-pd0-f170.google.com with SMTP id g10so2976746pdj.15 for ; Fri, 20 Dec 2013 12:47:46 -0800 (PST) Sender: Kukjin Kim Message-ID: <52B4ACED.2010007@samsung.com> Date: Sat, 21 Dec 2013 05:47:41 +0900 From: Kukjin Kim MIME-Version: 1.0 To: Bartlomiej Zolnierkiewicz Subject: Re: [PATCH v2 1/9] ARM: EXYNOS: cpuidle: fix AFTR mode check References: <1387565251-7051-1-git-send-email-b.zolnierkie@samsung.com> <1387565251-7051-2-git-send-email-b.zolnierkie@samsung.com> In-Reply-To: <1387565251-7051-2-git-send-email-b.zolnierkie@samsung.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: linux-samsung-soc@vger.kernel.org, linux-pm@vger.kernel.org, daniel.lezcano@linaro.org, rjw@rjwysocki.net, linux-kernel@vger.kernel.org, kyungmin.park@samsung.com, Kukjin Kim , linuxppc-dev@lists.ozlabs.org, lenb@kernel.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 12/21/13 03:47, Bartlomiej Zolnierkiewicz wrote: > The EXYNOS cpuidle driver code assumes that cpuidle core will handle > dev->state_count smaller than drv->state_count but currently this is > untrue (dev->state_count is used only for handling cpuidle state sysfs > entries and drv->state_count is used for all other cases) and will not > be fixed in the future as dev->state_count is planned to be removed. > > Fix the issue by checking for the max supported idle state in AFTR > state's ->enter handler (exynos4_enter_lowpower()) and entering AFTR > mode only when cores other than CPU0 are offline. > > Signed-off-by: Bartlomiej Zolnierkiewicz > Signed-off-by: Kyungmin Park > Acked-by: Daniel Lezcano > Cc: Kukjin Kim Acked-by: Kukjin Kim Thanks, Kukjin > --- > arch/arm/mach-exynos/cpuidle.c | 8 ++------ > 1 file changed, 2 insertions(+), 6 deletions(-) > > diff --git a/arch/arm/mach-exynos/cpuidle.c b/arch/arm/mach-exynos/cpuidle.c > index da65b03..f57cb91 100644 > --- a/arch/arm/mach-exynos/cpuidle.c > +++ b/arch/arm/mach-exynos/cpuidle.c > @@ -172,8 +172,8 @@ static int exynos4_enter_lowpower(struct cpuidle_device *dev, > { > int new_index = index; > > - /* This mode only can be entered when other core's are offline */ > - if (num_online_cpus()> 1) > + /* AFTR can only be entered when cores other than CPU0 are offline */ > + if (num_online_cpus()> 1 || dev->cpu != 0) > new_index = drv->safe_state_index; > > if (new_index == 0) > @@ -235,10 +235,6 @@ static int exynos_cpuidle_probe(struct platform_device *pdev) > device =&per_cpu(exynos4_cpuidle_device, cpu_id); > device->cpu = cpu_id; > > - /* Support IDLE only */ > - if (cpu_id != 0) > - device->state_count = 1; > - > ret = cpuidle_register_device(device); > if (ret) { > dev_err(&pdev->dev, "failed to register cpuidle device\n");