From: Santosh Shilimkar Date: Tue, 17 Apr 2012 09:39:20 +0000 (+0530) Subject: ARM: OMAP4: CPUidle: Open broadcast clock-event device. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b93d70aeb8f3b5ed2d74643f5009239a55634e1d;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git ARM: OMAP4: CPUidle: Open broadcast clock-event device. OMAP4 idle driver uses CLOCK_EVT_NOTIFY_BROADCAST_[ENTER/EXIT] for broadcast clock events. But _ENTER/_EXIT doesn't really open broadcast clock events and to explicitly setup the broadcast device, CLOCK_EVT_NOTIFY_BROADCAST_ON should be used. Add the missing CLOCK_EVT_NOTIFY_BROADCAST_ON clockevent notifications. This will setup the broadcast timer in either periodic/oneshot modes correctly. Recent clockevent infrastructure change 77b0d60 {leave the broadcast device in shutdown mode when not needed} exposed this bug leading to boot hangs in oneshot mode. Prior to this, periodic broadcast mode was also broken. This change fixes both the periodic/oneshot broadcast modes. Discussion thread : https://lkml.org/lkml/2012/4/9/13 Signed-off-by: Santosh Shilimkar Signed-off-by: Kevin Hilman --- diff --git a/arch/arm/mach-omap2/cpuidle44xx.c b/arch/arm/mach-omap2/cpuidle44xx.c index eb93e45d3271..45e6a54d5818 100644 --- a/arch/arm/mach-omap2/cpuidle44xx.c +++ b/arch/arm/mach-omap2/cpuidle44xx.c @@ -202,6 +202,16 @@ struct cpuidle_driver omap4_idle_driver = { .safe_state_index = 0, }; +/* + * For each cpu, setup the broadcast timer because local timers + * stops for the states above C1. + */ +static void omap_setup_broadcast_timer(void *arg) +{ + int cpu = smp_processor_id(); + clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ON, &cpu); +} + /** * omap4_idle_init - Init routine for OMAP4 idle * @@ -224,6 +234,9 @@ int __init omap4_idle_init(void) if (!cpu_clkdm[0] || !cpu_clkdm[1]) return -ENODEV; + /* Configure the broadcast timer on each cpu */ + on_each_cpu(omap_setup_broadcast_timer, NULL, 1); + for_each_cpu(cpu_id, cpu_online_mask) { dev = &per_cpu(omap4_idle_dev, cpu_id); dev->cpu = cpu_id;