linux-kernel - [PATCH] regulator: core: Fix off-on-delay-us for always-on/boot-on regulators

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Message-Id: <E25D6465-6475-42B4-90EB-3D2C3CAF3B20@kohlschuetter.com>
Date:   Sun, 17 Jul 2022 13:30:36 +0200
From:   Christian Kohlschuetter <christian@...lschuetter.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] regulator: core: Fix off-on-delay-us for always-on/boot-on
 regulators

Regulators marked with "regulator-always-on" or "regulator-boot-on"
as well as an "off-on-delay-us", may run into cycling issues that are
hard to detect.

This is caused by the "last_off" state not being initialized in this
case.

Fix the "last_off" initialization by setting it to the current kernel
time upon initialization, regardless of always_on/boot_on state.

Signed-off-by: Christian Kohlschütter <christian@...lschutter.com>
---
 drivers/regulator/core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index c4d844ffad7a..48ed33ad48c8 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1522,6 +1522,9 @@ static int set_machine_constraints(struct regulator_dev *rdev)
 		}
 	}
 
+	if (rdev->desc->off_on_delay)
+		rdev->last_off = ktime_get();
+
 	/* If the constraints say the regulator should be on at this point
 	 * and we have control then make sure it is enabled.
 	 */
@@ -1549,8 +1552,6 @@ static int set_machine_constraints(struct regulator_dev *rdev)
 
 		if (rdev->constraints->always_on)
 			rdev->use_count++;
-	} else if (rdev->desc->off_on_delay) {
-		rdev->last_off = ktime_get();
 	}
 
 	print_constraints(rdev);
-- 
2.36.1