From 118f5c1d5518032eec773164779f17d6e9b31586 Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Fri, 20 Dec 2013 19:47:23 +0100 Subject: [PATCH] ARM: EXYNOS: cpuidle: fix AFTR mode check 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 Acked-by: Kukjin Kim Signed-off-by: Rafael J. Wysocki --- 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 ddbfe8709fe7..8e0eb2ef8c41 100644 --- a/arch/arm/mach-exynos/cpuidle.c +++ b/arch/arm/mach-exynos/cpuidle.c @@ -151,8 +151,8 @@ 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) @@ -214,10 +214,6 @@ 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");