Re: [PATCH 6.6.y] pwm: imx-tpm: Count the number of enabled channels in probe

["Uwe Kleine-König" <ukleinek@kernel.org>]

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On Fri, May 15, 2026 at 04:51:50PM +0200, Greg KH wrote:
> On Sun, May 03, 2026 at 05:44:04PM +0200, Uwe Kleine-König wrote:
> > From: "Viorel Suman (OSS)" <viorel.suman@oss.nxp.com>
> > 
> > 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@oss.nxp.com>
> > Fixes: 738a1cfec2ed ("pwm: Add i.MX TPM PWM driver support")
> > Link: https://patch.msgid.link/20260311123309.348904-1-viorel.suman@oss.nxp.com
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
> > [ukleinek: backport to linux-6.6.y]
> > Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
> > ---
> >  drivers/pwm/pwm-imx-tpm.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> 
> What is the git id of this commit?

oops, sorry, I forgot to mention that

It's 3962c24f2d14e8a7f8a23f56b7ce320523947342.

Best regards
Uwe



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