When the timer supports complementary output, the enable bit is
overridden. It should be OR'ed. This makes all PWM channels for
such timer not to work.

Fixes: deaba9cff809 ("pwm: stm32: Implementation of the waveform callbacks")
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
---
 drivers/pwm/pwm-stm32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
index b889e64522c3..17e591f61efb 100644
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -84,7 +84,7 @@ static int stm32_pwm_round_waveform_tohw(struct pwm_chip *chip,
 
 	wfhw->ccer = TIM_CCER_CCxE(ch + 1);
 	if (priv->have_complementary_output)
-		wfhw->ccer = TIM_CCER_CCxNE(ch + 1);
+		wfhw->ccer |= TIM_CCER_CCxNE(ch + 1);
 
 	rate = clk_get_rate(priv->clk);
 
-- 
2.25.1

On Tue, Dec 17, 2024 at 04:00:21PM +0100, Fabrice Gasnier wrote:
> When the timer supports complementary output, the enable bit is
> overridden. It should be OR'ed. This makes all PWM channels for
> such timer not to work.
> 
> Fixes: deaba9cff809 ("pwm: stm32: Implementation of the waveform callbacks")
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
> ---
>  drivers/pwm/pwm-stm32.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
> index b889e64522c3..17e591f61efb 100644
> --- a/drivers/pwm/pwm-stm32.c
> +++ b/drivers/pwm/pwm-stm32.c
> @@ -84,7 +84,7 @@ static int stm32_pwm_round_waveform_tohw(struct pwm_chip *chip,
>  
>  	wfhw->ccer = TIM_CCER_CCxE(ch + 1);
>  	if (priv->have_complementary_output)
> -		wfhw->ccer = TIM_CCER_CCxNE(ch + 1);
> +		wfhw->ccer |= TIM_CCER_CCxNE(ch + 1);

Oh, indeed. Thanks for the fix.

Applied to 
https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git pwm/fixes
and I will send it to Linus later this week.

Best regards
Uwe