diff options
| author | Inderpal Singh <inderpal.singh@linaro.org> | 2012-01-06 17:06:50 +0530 |
|---|---|---|
| committer | Tushar Behera <tushar.behera@linaro.org> | 2012-05-17 10:31:07 +0530 |
| commit | e24b75d7de62491feee4ac0e73769738f1363610 (patch) | |
| tree | 6e08f16f891413208a3d9671fac79dab4bc126a1 /drivers/cpufreq | |
| parent | 9565c7c7bcf63166675dfcb7cbbdcae5892ba733 (diff) | |
ARM: EXYNOS: Add reboot notifier in cpufreq driver
Because of the mismatch between frequencies set by u-boot and
the kernel, the soft reboot used to hang. With reboot notifier,
before rebooting, this patch switches to same frequency set by
the uboot at boot time.
Signed-off-by: Inderpal Singh <inderpal.singh@linaro.org>
[tushar.behera@linaro.org: Merged changes with exynos-cpufreq.c]
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/exynos-cpufreq.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c index b243a7ee01f..7ebd6b7bdd1 100644 --- a/drivers/cpufreq/exynos-cpufreq.c +++ b/drivers/cpufreq/exynos-cpufreq.c @@ -17,6 +17,8 @@ #include <linux/regulator/consumer.h> #include <linux/cpufreq.h> #include <linux/suspend.h> +#include <linux/notifier.h> +#include <linux/reboot.h> #include <mach/cpufreq.h> @@ -204,6 +206,31 @@ static struct notifier_block exynos_cpufreq_nb = { .notifier_call = exynos_cpufreq_pm_notifier, }; +static int exynos_cpufreq_reboot_notifier(struct notifier_block *this, + unsigned long code, void *_cmd) +{ + struct cpufreq_policy *policy = cpufreq_cpu_get(0); /* boot CPU */ + mutex_lock(&cpufreq_lock); + + if (frequency_locked) + goto out; + frequency_locked = true; + + if (locking_frequency) { + mutex_unlock(&cpufreq_lock); + exynos_target(policy, locking_frequency, CPUFREQ_RELATION_H); + mutex_lock(&cpufreq_lock); + } + +out: + mutex_unlock(&cpufreq_lock); + return NOTIFY_DONE; +} + +static struct notifier_block exynos_cpufreq_reboot_nb = { + .notifier_call = exynos_cpufreq_reboot_notifier, +}; + static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy) { policy->cur = policy->min = policy->max = exynos_getspeed(policy->cpu); @@ -276,6 +303,7 @@ static int __init exynos_cpufreq_init(void) } register_pm_notifier(&exynos_cpufreq_nb); + register_reboot_notifier(&exynos_cpufreq_reboot_nb); if (cpufreq_register_driver(&exynos_driver)) { pr_err("%s: failed to register cpufreq driver\n", __func__); |