This is a note to let you know that I've just added the patch titled
regulator: pwm-regulator: Add validity checks in continuous .get_voltage
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
regulator-pwm-regulator-add-validity-checks-in-conti.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a212098af32f82d4609f3966e63811e4b6702ed2
Author: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Date: Sat Jan 13 23:46:26 2024 +0100
regulator: pwm-regulator: Add validity checks in continuous .get_voltage
[ Upstream commit c92688cac239794e4a1d976afa5203a4d3a2ac0e ]
Continuous regulators can be configured to operate only in a certain
duty cycle range (for example from 0..91%). Add a check to error out if
the duty cycle translates to an unsupported (or out of range) voltage.
Suggested-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Link: https://msgid.link/r/20240113224628.377993-2-martin.blumenstingl@xxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index 34f3b9778ffa1..215581dfd3330 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -164,6 +164,9 @@ static int pwm_regulator_get_voltage(struct regulator_dev *rdev)
pwm_get_state(drvdata->pwm, &pstate);
voltage = pwm_get_relative_duty_cycle(&pstate, duty_unit);
+ if (voltage < min(max_uV_duty, min_uV_duty) ||
+ voltage > max(max_uV_duty, min_uV_duty))
+ return -ENOTRECOVERABLE;
/*
* The dutycycle for min_uV might be greater than the one for max_uV.
