diff options
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index a0dba9beac05..5f0f983ce173 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -541,6 +541,38 @@ void cpufreq_freq_transition_end(struct cpufreq_policy *policy, } EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end); +/** + * cpufreq_driver_resolve_freq - Map a target frequency to a driver-supported + * one. + * @target_freq: target frequency to resolve. + * + * The target to driver frequency mapping is cached in the policy. + * + * Return: Lowest driver-supported frequency greater than or equal to the + * given target_freq, subject to policy (min/max) and driver limitations. + */ +unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy, + unsigned int target_freq) +{ + target_freq = clamp_val(target_freq, policy->min, policy->max); + policy->cached_target_freq = target_freq; + + if (cpufreq_driver->target_index) { + int idx, rv; + + rv = cpufreq_frequency_table_target(policy, policy->freq_table, + target_freq, + CPUFREQ_RELATION_L, + &idx); + if (rv) + return target_freq; + policy->cached_resolved_idx = idx; + return policy->freq_table[idx].frequency; + } + + return target_freq; +} +EXPORT_SYMBOL_GPL(cpufreq_driver_resolve_freq); /********************************************************************* * SYSFS INTERFACE * @@ -2536,6 +2568,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) if (!(cpufreq_driver->flags & CPUFREQ_STICKY) && list_empty(&cpufreq_policy_list)) { /* if all ->init() calls failed, unregister */ + ret = -ENODEV; pr_debug("%s: No CPU initialized for driver %s\n", __func__, driver_data->name); goto err_if_unreg; |