On 18-01-21, 03:55, Dmitry Osipenko wrote:
> Extend OPP API with dev_pm_opp_sync_regulators() function, which syncs
> voltage state of regulators.
>
> Tested-by: Peter Geis <pgwipeout@xxxxxxxxx>
> Tested-by: Nicolas Chauvet <kwizart@xxxxxxxxx>
> Tested-by: Matt Merhar <mattmerhar@xxxxxxxxxxxxxx>
> Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
> ---
> drivers/opp/core.c | 45 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/pm_opp.h | 6 ++++++
> 2 files changed, 51 insertions(+)
>
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 7b4d07279638..99d18befc209 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -2686,3 +2686,48 @@ 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 (!opp_table->regulators)
> + goto put_table;
> +
> + mutex_lock(&opp_table->lock);
What exactly do you need this lock for ?
> +
> + /* Nothing to sync if voltage wasn't changed */
> + if (!opp_table->enabled)
> + goto unlock;
> +
> + for (i = 0; i < opp_table->regulator_count; i++) {
> + reg = opp_table->regulators[i];
> + ret = regulator_sync_voltage(reg);
> + if (ret)
> + break;
> + }
> +unlock:
> + mutex_unlock(&opp_table->lock);
> +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 c24bd34339d7..1c3a09cc8dcd 100644
> --- a/include/linux/pm_opp.h
> +++ b/include/linux/pm_opp.h
> @@ -162,6 +162,7 @@ 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)
> {
> @@ -398,6 +399,11 @@ 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)
> --
> 2.29.2
--
viresh
