diff options
| author | Huisung Kang <hs1218.kang@samsung.com> | 2011-06-24 16:04:15 +0900 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2011-07-13 18:29:57 -0400 |
| commit | 405e6d6df739a27a267b381213aa9e86c4929543 (patch) | |
| tree | 9efe5f032219af2a08c971117b9f062f4d0eff1b /drivers/cpufreq | |
| parent | e8b4c1986efbb5b1e1bab9f359c340816e4d9869 (diff) | |
[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>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/s5pv210-cpufreq.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c index 9a5b28474342..79b1b4ec8e3c 100644 --- a/drivers/cpufreq/s5pv210-cpufreq.c +++ b/drivers/cpufreq/s5pv210-cpufreq.c @@ -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); } |