PM / OPP: Introduce dev_pm_opp_get_max_volt_latency()
In few use cases (like: cpufreq), it is desired to get the maximum voltage latency for changing OPPs. Add support for that. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -230,6 +230,65 @@ unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
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/**
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* dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds
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* @dev: device for which we do this operation
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*
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* Return: This function returns the max voltage latency in nanoseconds.
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*
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* Locking: This function takes rcu_read_lock().
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*/
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unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
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{
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struct device_opp *dev_opp;
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struct dev_pm_opp *opp;
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struct regulator *reg;
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unsigned long latency_ns = 0;
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unsigned long min_uV = ~0, max_uV = 0;
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int ret;
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rcu_read_lock();
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dev_opp = _find_device_opp(dev);
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if (IS_ERR(dev_opp)) {
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rcu_read_unlock();
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return 0;
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}
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reg = dev_opp->regulator;
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if (IS_ERR_OR_NULL(reg)) {
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/* Regulator may not be required for device */
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if (reg)
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dev_err(dev, "%s: Invalid regulator (%ld)\n", __func__,
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PTR_ERR(reg));
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rcu_read_unlock();
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return 0;
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}
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list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) {
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if (!opp->available)
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continue;
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if (opp->u_volt_min < min_uV)
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min_uV = opp->u_volt_min;
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if (opp->u_volt_max > max_uV)
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max_uV = opp->u_volt_max;
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}
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rcu_read_unlock();
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/*
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* The caller needs to ensure that dev_opp (and hence the regulator)
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* isn't freed, while we are executing this routine.
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*/
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ret = regulator_set_voltage_time(reg, min_uV, max_uV);
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if (ret > 0)
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latency_ns = ret * 1000;
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return latency_ns;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
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/**
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* dev_pm_opp_get_suspend_opp() - Get suspend opp
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* @dev: device for which we do this operation
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@ -34,6 +34,7 @@ bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
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int dev_pm_opp_get_opp_count(struct device *dev);
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unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
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unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev);
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struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev);
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struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
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@ -88,6 +89,11 @@ static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
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{
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return 0;
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}
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static inline struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
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{
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return NULL;
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