diff options
| author | Dmitry Osipenko <digetx@gmail.com> | 2021-01-21 01:26:47 +0300 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2021-02-02 10:27:05 +0530 |
| commit | ce8073d83f63a2cdcfc1b86d769456726faad51d (patch) | |
| tree | b51332117c579a1f0dd51927e44567edee039f30 | |
| parent | 597ff5431fd41afa888809f7936508a15c977cde (diff) | |
opp: Add dev_pm_opp_sync_regulators()
Extend OPP API with dev_pm_opp_sync_regulators() function, which syncs
voltage state of regulators.
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[ Viresh: Added unlikely() ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
| -rw-r--r-- | drivers/opp/core.c | 41 | ||||
| -rw-r--r-- | include/linux/pm_opp.h | 6 |
2 files changed, 47 insertions, 0 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 64a95aaa90eb..bf7cdab0ba64 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -2584,3 +2584,44 @@ void dev_pm_opp_remove_table(struct device *dev) dev_pm_opp_put_opp_table(opp_table); } EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); + +/** + * dev_pm_opp_sync_regulators() - Sync state of voltage regulators + * @dev: device for which we do this operation + * + * Sync voltage state of the OPP table regulators. + * + * Return: 0 on success or a negative error value. + */ +int dev_pm_opp_sync_regulators(struct device *dev) +{ + struct opp_table *opp_table; + struct regulator *reg; + int i, ret = 0; + + /* Device may not have OPP table */ + opp_table = _find_opp_table(dev); + if (IS_ERR(opp_table)) + return 0; + + /* Regulator may not be required for the device */ + if (unlikely(!opp_table->regulators)) + goto put_table; + + /* Nothing to sync if voltage wasn't changed */ + if (!opp_table->enabled) + goto put_table; + + for (i = 0; i < opp_table->regulator_count; i++) { + reg = opp_table->regulators[i]; + ret = regulator_sync_voltage(reg); + if (ret) + break; + } +put_table: + /* Drop reference taken by _find_opp_table() */ + dev_pm_opp_put_opp_table(opp_table); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators); diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 8f926815bad9..979b208bc4a8 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -161,6 +161,7 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cp int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask); void dev_pm_opp_remove_table(struct device *dev); void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask); +int dev_pm_opp_sync_regulators(struct device *dev); #else static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) { @@ -384,6 +385,11 @@ static inline void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask { } +static inline int dev_pm_opp_sync_regulators(struct device *dev) +{ + return -ENOTSUPP; +} + #endif /* CONFIG_PM_OPP */ #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF) |