diff options
| author | Puneet Saxena <puneets@nvidia.com> | 2012-04-19 12:32:29 +0530 |
|---|---|---|
| committer | Varun Wadekar <vwadekar@nvidia.com> | 2012-05-14 17:58:36 +0530 |
| commit | 812dbacb091f37e1e2b818c1e89f59c58a1f5d00 (patch) | |
| tree | 9b576fa7824d8cfd68306aad373237d37456af83 /drivers/cpufreq | |
| parent | 5b39689e638d3c66172388e10bc65d23eb437350 (diff) | |
cpufreq: interface for setting governor for a cpu
This implementation sets governor for a cpu using existing
cpufreq interfaces.
bug 871958
Change-Id: Ic4e7e2a2b0babaf1829b559b5db211666d449b86
Signed-off-by: Puneet Saxena <puneets@nvidia.com>
Reviewed-on: http://git-master/r/97939
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 2b6e0a08b35e..7a306829760d 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1804,6 +1804,56 @@ 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) { |