diff options
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 50 | ||||
| -rw-r--r-- | include/linux/cpufreq.h | 1 |
2 files changed, 51 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 3acc42805e21..5bbe8c3d9e96 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1785,6 +1785,56 @@ no_policy: } EXPORT_SYMBOL(cpufreq_update_policy); +/* + * cpufreq_set_gov - set governor for a cpu + * @cpu: CPU whose governor needs to be changed + * @target_gov: new governor to be set + */ +int cpufreq_set_gov(char *target_gov, unsigned int cpu) +{ + int ret = 0; + struct cpufreq_policy new_policy; + struct cpufreq_policy *cur_policy; + + if (target_gov == NULL) + return -EINVAL; + + /* Get current governer */ + cur_policy = cpufreq_cpu_get(cpu); + if (!cur_policy) + return -EINVAL; + + new_policy = *cur_policy; + if (!strncmp(cur_policy->governor->name, target_gov, + strlen(target_gov))) { + /* Target governer & current governer is same */ + ret = -EINVAL; + goto err_out; + } else { + if (cpufreq_parse_governor(target_gov, &new_policy.policy, + &new_policy.governor)) { + ret = -EINVAL; + goto err_out; + } + + if (lock_policy_rwsem_write(cur_policy->cpu) < 0) { + ret = -EINVAL; + goto err_out; + } + + ret = __cpufreq_set_policy(cur_policy, &new_policy); + + cur_policy->user_policy.policy = cur_policy->policy; + cur_policy->user_policy.governor = cur_policy->governor; + + unlock_policy_rwsem_write(cur_policy->cpu); + } +err_out: + cpufreq_cpu_put(cur_policy); + return ret; +} +EXPORT_SYMBOL(cpufreq_set_gov); + static int __cpuinit cpufreq_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index c6126b9fb7cf..09b8ea9e194b 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -310,6 +310,7 @@ __ATTR(_name, 0644, show_##_name, store_##_name) *********************************************************************/ int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); int cpufreq_update_policy(unsigned int cpu); +int cpufreq_set_gov(char *target_gov, unsigned int cpu); #ifdef CONFIG_CPU_FREQ /* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */ |