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 --- drivers/base/power/opp/core.c | 59 +++++++++++++++++++++++++++++++++++++++++++ include/linux/pm_opp.h | 6 +++++ 2 files changed, 65 insertions(+)
diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 04fe181b8132..e272e738a8d0 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -226,6 +226,65 @@ unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
/** + * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds + * @dev: device for which we do this operation + * + * Return: This function returns the max voltage latency in nanoseconds. + * + * Locking: This function takes rcu_read_lock(). + */ +unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) +{ + struct device_opp *dev_opp; + struct dev_pm_opp *opp; + struct opp_supply *supply; + struct regulator *reg; + unsigned long latency_ns = 0; + unsigned long min_uV, max_uV; + int count, ret; + + rcu_read_lock(); + + dev_opp = _find_device_opp(dev); + if (IS_ERR(dev_opp)) + goto unlock; + + /* Sum max latencies for all supplies */ + for (count = 0; count < dev_opp->supply_count; count++) { + min_uV = ~0; + max_uV = 0; + + reg = dev_opp->regulators[count]; + + /* Regulator may not be available for device */ + if (IS_ERR(reg)) + continue; + + list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) { + if (!opp->available) + continue; + + supply = opp->supplies + count; + + if (supply->u_volt_min < min_uV) + min_uV = supply->u_volt_min; + if (supply->u_volt_max > max_uV) + max_uV = supply->u_volt_max; + } + + ret = regulator_set_voltage_time(reg, min_uV, max_uV); + if (ret > 0) + latency_ns += ret * 1000; + } + +unlock: + rcu_read_unlock(); + + return latency_ns; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); + +/** * dev_pm_opp_get_suspend_opp() - Get suspend opp * @dev: device for which we do this operation * diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 9a2e50337af9..fd58e2074721 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -34,6 +34,7 @@ bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
int dev_pm_opp_get_opp_count(struct device *dev); unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev); +unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev); struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev);
struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, @@ -81,6 +82,11 @@ static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) return 0; }
+static inline unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) +{ + return 0; +} + static inline struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev) { return NULL;