regulator: da9121: Prevent current limit change when enabled

BugLink: https://bugs.launchpad.net/bugs/1959376
[ Upstream commit 24f0853228f3b98f1ef08d5824376c69bb8124d2 ]

Prevent changing current limit when enabled as a precaution against
possibile instability due to tight integration with switching cycle

Signed-off-by: Adam Ward <Adam.Ward.opensource@diasemi.com>
Link: https://lore.kernel.org/r/52ee682476004a1736c1e0293358987319c1c415.1638223185.git.Adam.Ward.opensource@diasemi.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>

diff --git a/drivers/regulator/da9121-regulator.c b/drivers/regulator/da9121-regulator.c
index d016e049d2641836372114977df9833a477938e7..7f99b0f4da34539e7a11f95842624a8a3a757880 100644 (file)
--- a/drivers/regulator/da9121-regulator.c
+++ b/drivers/regulator/da9121-regulator.c
@@ -276,6 +276,11 @@ static int da9121_set_current_limit(struct regulator_dev *rdev,
                goto error;
        }
 
+       if (rdev->desc->ops->is_enabled(rdev)) {
+               ret = -EBUSY;
+               goto error;
+       }
+
        ret = da9121_ceiling_selector(rdev, min_ua, max_ua, &sel);
        if (ret < 0)
                goto error;