[CPUFREQ] S5PV210: Add reboot notifier to prevent system hang

When system reboot, the CPUFREQ level should be 800MHz to prevent
system lockup.

Signed-off-by: Huisung Kang <hs1218.kang@samsung.com>
Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
index 155242cfc714..7c4bb070b904 100644
--- a/drivers/cpufreq/s5pv210-cpufreq.c
+++ b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -16,6 +16,7 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/cpufreq.h>
+#include <linux/reboot.h>
 #include <linux/regulator/consumer.h>
 #include <linux/suspend.h>
 
@@ -590,6 +591,19 @@ static int s5pv210_cpufreq_notifier_event(struct notifier_block *this,
         return NOTIFY_DONE;
 }
 
+static int s5pv210_cpufreq_reboot_notifier_event(struct notifier_block *this,
+                                                 unsigned long event, void *ptr)
+{
+        int ret;
+
+        ret = cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ,
+                                    DISABLE_FURTHER_CPUFREQ);
+        if (ret < 0)
+                return NOTIFY_BAD;
+
+        return NOTIFY_DONE;
+}
+
 static struct cpufreq_driver s5pv210_driver = {
         .flags          = CPUFREQ_STICKY,
         .verify         = s5pv210_verify_speed,
@@ -607,6 +621,10 @@ static struct notifier_block s5pv210_cpufreq_notifier = {
         .notifier_call = s5pv210_cpufreq_notifier_event,
 };
 
+static struct notifier_block s5pv210_cpufreq_reboot_notifier = {
+        .notifier_call = s5pv210_cpufreq_reboot_notifier_event,
+};
+
 static int __init s5pv210_cpufreq_init(void)
 {
         arm_regulator = regulator_get(NULL, "vddarm");
@@ -623,6 +641,7 @@ static int __init s5pv210_cpufreq_init(void)
         }
 
         register_pm_notifier(&s5pv210_cpufreq_notifier);
+        register_reboot_notifier(&s5pv210_cpufreq_reboot_notifier);
 
         return cpufreq_register_driver(&s5pv210_driver);
 }