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Commit fe7f1bcb authored by Huisung Kang's avatar Huisung Kang Committed by Dave Jones
Browse files

[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: default avatarHuisung Kang <hs1218.kang@samsung.com>
Signed-off-by: default avatarJonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent 74df8e69

drivers/cpufreq/s5pv210-cpufreq.c

+19 −0
Original line number Diff line number Diff line
@@ -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);

}