regulator: da9121: Prevent current limit change when enabled

BugLink: https://bugs.launchpad.net/bugs/1959376 [ Upstream commit 24f0853 ] Prevent changing current limit when enabled as a precaution against possibile instability due to tight integration with switching cycle Signed-off-by: Adam Ward <[email protected]> Link: https://lore.kernel.org/r/52ee682476004a1736c1e0293358987319c1c415.1638223185.git.Adam.Ward.opensource@diasemi.com Signed-off-by: Mark Brown <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: Paolo Pisati <[email protected]>
tobhe · Dec 15, 2022 · 9ac606e · 9ac606e
1 parent 05e2640
commit 9ac606e
Showing 1 changed file with 5 additions and 0 deletions.
diff --git 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;