openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Dmitry Osipenko 2021-01-21 01:26:47 +03:00 committed by Viresh Kumar
parent 597ff5431f
commit ce8073d83f
2 changed files with 47 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/opp/core.c
View File

@ -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);

6
include/linux/pm_opp.h
View File

@ -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)