[PATCH 06/10] regulator: core: Use ktime_get_boottime() in set_machine_constraints()

[Lee Jones <lee@kernel.org>]

rdev->last_off is tracked against CLOCK_BOOTTIME in both
_regulator_do_enable() and _regulator_do_disable(), whereas
set_machine_constraints() initialises rdev->last_off using ktime_get()
(CLOCK_MONOTONIC).  If the system suspends before a regulator with
off_on_delay is enabled, comparing a CLOCK_BOOTTIME timestamp against a
CLOCK_MONOTONIC timestamp produces an incorrect elapsed off-time.

Use ktime_get_boottime() in set_machine_constraints() so rdev->last_off
uses the same clock base everywhere.

Fixes: 691c1fcda535 ("regulator: core: Shorten off-on-delay-us for always-on/boot-on by time since booted")
Closes: https://sashiko.dev/#/bug/linux-4afd38c3-0589-4544-961d-4e3cc5ed8639
Cc: stable@vger.kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
---
 drivers/regulator/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 6d522731e4d9..6b5fae3cd486 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1698,7 +1698,7 @@ 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();
+		rdev->last_off = ktime_get_boottime();
 	}
 
 	if (!rdev->constraints->pw_budget_mW)
-- 
2.56.0.385.gac671c819a-goog