Commit 7346e7a058a2 ("pwm: stm32: Always do lazy disabling") triggered a regression where PWM polarity changes could be ignored.

stm32_pwm_set_polarity() was skipped due to a mismatch between the cached pwm->state.polarity and the actual hardware state, leaving the hardware polarity unchanged.

Fixes: 7edf7369205b ("pwm: Add driver for STM32 plaftorm") Cc: stable@vger.kernel.org # <= 6.12 Signed-off-by: Sean Nyekjaer sean@geanix.com Co-developed-by: Uwe Kleine-König ukleinek@kernel.org --- This patch is only applicable for stable tree's <= 6.12 --- Changes in v2: - Taken patch improvements for Uwe - Link to v1: https://lore.kernel.org/r/20260106-stm32-pwm-v1-1-33e9e8a9fc33@geanix.com --- drivers/pwm/pwm-stm32.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c index eb24054f9729734da21eb96f2e37af03339e3440..86e6eb7396f67990249509dd347cb5a60c9ccf16 100644 --- a/drivers/pwm/pwm-stm32.c +++ b/drivers/pwm/pwm-stm32.c @@ -458,8 +458,7 @@ static int stm32_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; }

- if (state->polarity != pwm->state.polarity) - stm32_pwm_set_polarity(priv, pwm->hwpwm, state->polarity); + stm32_pwm_set_polarity(priv, pwm->hwpwm, state->polarity);

ret = stm32_pwm_config(priv, pwm->hwpwm, state->duty_cycle, state->period);

--- base-commit: eb18504ca5cf1e6a76a752b73daf0ef51de3551b change-id: 20260105-stm32-pwm-91cb843680f4

Best regards,