On 6/27/2019 7:04 PM, Sibi Sankar wrote:
Add and export 'dev_pm_opp_update_voltage' to find and update voltage of an opp for a given frequency. This will be useful to update the opps with voltages read back from firmware. Signed-off-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx> --- drivers/opp/core.c | 52 ++++++++++++++++++++++++++++++++++++++++++ include/linux/pm_opp.h | 10 ++++++++ 2 files changed, 62 insertions(+) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 68551d6366e6b..c85c04dc2c7de 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -2197,6 +2197,58 @@ int dev_pm_opp_disable(struct device *dev, unsigned long freq) } EXPORT_SYMBOL_GPL(dev_pm_opp_disable);+/**+ * dev_pm_opp_update_voltage() - Find and update voltage + * @dev: device for which we do this operation + * @freq: OPP frequency to update voltage + * @u_volt: voltage requested for this opp + * + * Find and update voltage of a disabled opp corresponding to the given + * frequency. This is useful only for devices with single power supply. + * + * Return: 0 if no modification was done OR modification was + * successful or a negative error value. + */ +int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq, + unsigned long u_volt) +{ + struct dev_pm_opp *opp = ERR_PTR(-ENODEV); + struct opp_table *opp_table; + unsigned long tol; + int ret = 0; + + opp = dev_pm_opp_find_freq_exact(dev, freq, false); + if (IS_ERR(opp)) + return PTR_ERR(opp); + + /* Find the opp_table */ + opp_table = _find_opp_table(dev);
maybe you should look for the opp_table first and then the opp? otherwise this check seems pretty redundant given the above call would have failed if the opp table did not exist.
+ if (IS_ERR(opp_table)) {
+ ret = PTR_ERR(opp_table);
+ dev_err(dev, "%s: OPP table not found (%d)\n", __func__, ret);
+ goto put_opp;
+ }
+
+ mutex_lock(&opp_table->lock);
+
+ /* update only if the opp is disabled */
+ if (opp->available)
+ goto unlock;
should this throw a warning/error to indicate someone tried to update this at a wrong time? and perhaps return an error instead of success.
+ + tol = u_volt * opp_table->voltage_tolerance_v1 / 100; + opp->supplies[0].u_volt_min = u_volt - tol; + opp->supplies[0].u_volt = u_volt; + opp->supplies[0].u_volt_min = u_volt + tol; + +unlock: + mutex_unlock(&opp_table->lock); + dev_pm_opp_put_opp_table(opp_table); +put_opp: + dev_pm_opp_put(opp); + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_update_voltage); + /** * dev_pm_opp_register_notifier() - Register OPP notifier for the device * @dev: Device for which notifier needs to be registered diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 87fa09d93d8c2..a17c462974851 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -130,6 +130,9 @@ int dev_pm_opp_enable(struct device *dev, unsigned long freq);int dev_pm_opp_disable(struct device *dev, unsigned long freq); +int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq,+ unsigned long u_volt); + int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb); int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb);@@ -261,6 +264,13 @@ static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)return 0; }+static inline int dev_pm_opp_update_voltage(struct device *dev,+ unsigned long freq, + unsigned long u_volt) +{ + return 0; +} + static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) { return -ENOTSUPP;
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