Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 405e6d6d authored by Huisung Kang's avatar Huisung Kang Committed by Dave Jones
Browse files

[CPUFREQ] S5PV210: Add pm_notifier to prevent system unstable 



Minimum 800MHz is needed to enter/exit suspend mode due to voltage mismatch.

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 e8b4c198

drivers/cpufreq/s5pv210-cpufreq.c

+34 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/io.h>

#include <linux/cpufreq.h>

#include <linux/regulator/consumer.h>

#include <linux/suspend.h>



#include <mach/map.h>

#include <mach/regs-clock.h>
@@ -30,6 +31,9 @@ static struct cpufreq_freqs freqs; 
#define APLL_VAL_1000	((1 << 31) | (125 << 16) | (3 << 8) | 1)

#define APLL_VAL_800	((1 << 31) | (100 << 16) | (3 << 8) | 1)



/* Use 800MHz when entering sleep mode */

#define SLEEP_FREQ	(800 * 1000)



/*

 * relation has an additional symantics other than the standard of cpufreq

 * DISALBE_FURTHER_CPUFREQ: disable further access to target
@@ -552,6 +556,30 @@ static int __init s5pv210_cpu_init(struct cpufreq_policy *policy) 
	return ret;

}



static int s5pv210_cpufreq_notifier_event(struct notifier_block *this,

					  unsigned long event, void *ptr)

{

	int ret;



	switch (event) {

	case PM_SUSPEND_PREPARE:

		ret = cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ,

					    DISABLE_FURTHER_CPUFREQ);

		if (ret < 0)

			return NOTIFY_BAD;



		return NOTIFY_OK;

	case PM_POST_RESTORE:

	case PM_POST_SUSPEND:

		cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ,

				      ENABLE_FURTHER_CPUFREQ);



		return NOTIFY_OK;

	}



	return NOTIFY_DONE;

}



static struct cpufreq_driver s5pv210_driver = {

	.flags		= CPUFREQ_STICKY,

	.verify		= s5pv210_verify_speed,
@@ -565,6 +593,10 @@ static struct cpufreq_driver s5pv210_driver = { 
#endif

};



static struct notifier_block s5pv210_cpufreq_notifier = {

	.notifier_call = s5pv210_cpufreq_notifier_event,

};



static int __init s5pv210_cpufreq_init(void)

{

	arm_regulator = regulator_get(NULL, "vddarm");
@@ -580,6 +612,8 @@ static int __init s5pv210_cpufreq_init(void) 
		return PTR_ERR(int_regulator);

	}



	register_pm_notifier(&s5pv210_cpufreq_notifier);



	return cpufreq_register_driver(&s5pv210_driver);

}