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[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: 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>
This commit is contained in:
Huisung Kang 2011-06-24 16:04:15 +09:00 committed by Dave Jones
parent e8b4c1986e
commit 405e6d6df7
1 changed files with 34 additions and 0 deletions
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34
drivers/cpufreq/s5pv210-cpufreq.c
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@ -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 @@ out_dmc0:
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);
}