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 <santosh.shilimkar@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

diff --git a/arch/arm/mach-omap2/cpuidle44xx.c b/arch/arm/mach-omap2/cpuidle44xx.c
index eb93e45d32710364134e81ae34e66c4615e55b41..45e6a54d58187844b66336bf42c29b9946f1a4e1 100644 (file)
--- 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;