Re: [PATCH v3] pwm: imx-tpm: count the number of enabled channels in probe

[Uwe Kleine-König]

Hello,

On Wed, Mar 11, 2026 at 02:33:09PM +0200, Viorel Suman (OSS) wrote:
> On a soft reset TPM PWM IP may preserve its internal state from
> previous runtime, therefore on a subsequent OS boot and driver
> probe "enable_count" value and TPM PWM IP internal channels
> "enabled" states may get unaligned. In consequence on a suspend/resume
> cycle the call "if (--tpm->enable_count == 0)" may lead to
> "enable_count" overflow the system being blocked from entering
> suspend due to:
> 
>    if (tpm->enable_count > 0)
>        return -EBUSY;
> 
> Fix the problem by counting the enabled channels in probe function.
> 
> Signed-off-by: Viorel Suman (OSS) <viorel.suman@xxxxxxxxxxx>

Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git pwm/for-next

with Cc: stable. Given that the issue is already old (May 2019 in
5.2-rc1) I tend to not send it for inclusion into v7.0, but if something
more urgent pops up I'll probably send it along.

Best regards
Uwe

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