Re: [PATCH v2] pwm: stm32: Always program polarity

[Uwe Kleine-König]

Hello Greg,

On Thu, Jan 08, 2026 at 01:45:23PM +0100, Sean Nyekjaer wrote:
> 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@xxxxxxxxxxxxxxx # <= 6.12
> Signed-off-by: Sean Nyekjaer <sean@xxxxxxxxxx>
> Co-developed-by: Uwe Kleine-König <ukleinek@xxxxxxxxxx>
Signed-off-by: Uwe Kleine-König <ukleinek@xxxxxxxxxx>

> ---
> This patch is only applicable for stable tree's <= 6.12

Can you please apply this patch to v6.12.x and older? The problem fixed
here doesn't happen in mainline since commit deaba9cff809 ("pwm: stm32:
Implementation of the waveform callbacks"). That mainline commit however
is too intrusive to backport it to stable, not even considering its
dependencies (e.g. 17e40c25158f ("pwm: New abstraction for PWM
waveforms")). 

I assume such an exception to the sable process is ok and the patch is
simple enough to be easily reviewable? If not, tell me, then I can apply
the patch and merge it (with `-s ours`) into my next PWM pull request to
Linus :-)

Best regards
Uwe

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