From: Javier Martinez Canillas javier@osg.samsung.com
commit 5e3ca2b349b1e2c80b060b51bbf2af37448fad85 upstream.
Commit 6261b06de565 ("regulator: Defer lookup of supply to regulator_get") moved the regulator supplies lookup logic from the regulators registration to the regulators get time.
Unfortunately, that changed the behavior of the regulator core since now a parent supply with a child regulator marked as always-on, won't be enabled unless a client driver attempts to get the child regulator during boot.
This patch tries to resolve the parent supply for the already registered regulators each time that a new regulator is registered. So the regulators that have child regulators marked as always on will be enabled regardless if a driver gets the child regulator or not.
That was the behavior before the mentioned commit, since parent supplies were looked up at regulator registration time instead of during child get.
Since regulator_resolve_supply() checks for rdev->supply, most of the times it will be a no-op. Errors aren't checked to keep the possible out of order dependencies which was the motivation for the mentioned commit.
Also, the supply being available will be enforced on regulator get anyways in case the resolve fails on regulators registration.
Fixes: 6261b06de565 ("regulator: Defer lookup of supply to regulator_get") Suggested-by: Mark Brown broonie@kernel.org Signed-off-by: Javier Martinez Canillas javier@osg.samsung.com Signed-off-by: Mark Brown broonie@kernel.org Cc: stable@vger.kernel.org # 4.1+ Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/regulator/core.c | 9 +++++++++ 1 file changed, 9 insertions(+)
--- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -3822,6 +3822,11 @@ static void rdev_init_debugfs(struct reg &rdev->bypass_count); }
+static int regulator_register_resolve_supply(struct device *dev, void *data) +{ + return regulator_resolve_supply(dev_to_rdev(dev)); +} + /** * regulator_register - register regulator * @regulator_desc: regulator to register @@ -3968,6 +3973,10 @@ regulator_register(const struct regulato }
rdev_init_debugfs(rdev); + + /* try to resolve regulators supply since a new one was registered */ + class_for_each_device(®ulator_class, NULL, NULL, + regulator_register_resolve_supply); out: mutex_unlock(®ulator_list_mutex); kfree(config);