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authorDmitry Osipenko <digetx@gmail.com>2021-01-20 23:26:47 +0100
committerViresh Kumar <viresh.kumar@linaro.org>2021-02-02 05:57:05 +0100
commitce8073d83f63a2cdcfc1b86d769456726faad51d (patch)
treeb51332117c579a1f0dd51927e44567edee039f30 /drivers/opp
parentopp: Add dev_pm_opp_get_required_pstate() (diff)
downloadlinux-ce8073d83f63a2cdcfc1b86d769456726faad51d.tar.xz
linux-ce8073d83f63a2cdcfc1b86d769456726faad51d.zip
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>
Diffstat (limited to 'drivers/opp')
-rw-r--r--drivers/opp/core.c41
1 files changed, 41 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);