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| author | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2012-04-17 11:39:20 +0200 |
|---|---|---|
| committer | Kevin Hilman <khilman@ti.com> | 2012-07-26 01:06:08 +0200 |
| commit | b93d70aeb8f3b5ed2d74643f5009239a55634e1d (patch) | |
| tree | 925d3102051db9664772911f29a59155825c671d /arch/arm | |
| parent | ARM: OMAP4: CPUidle: add synchronization for coupled idle states (diff) | |
| download | linux-b93d70aeb8f3b5ed2d74643f5009239a55634e1d.tar.xz linux-b93d70aeb8f3b5ed2d74643f5009239a55634e1d.zip | |
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>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-omap2/cpuidle44xx.c | 13 |
1 files changed, 13 insertions, 0 deletions
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; |