The modulo register defines the period of the edge-aligned PWM mode
(which is the only mode implemented). The reference manual states:
"The EPWM period is determined by (MOD + 0001h) ..." So the value that
is written to the MOD register must therefore be one less than the
calculated period length. Return -EINVAL if the calculated length is
already zero.
A correct MODULO value is particularly relevant if the PWM has to output
a high frequency due to a low period value.

Fixes: 738a1cfec2ed ("pwm: Add i.MX TPM PWM driver support")
Cc: stable@vger.kernel.org
Signed-off-by: Erik Schumacher <erik.schumacher@iris-sensing.com>
---
v2:
 - Add Fixes: and Cc: tags
v3:
 - Add period_count == 0 check and return -EINVAL

 drivers/pwm/pwm-imx-tpm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c
index 96ea343856f0..7ee7b65b9b90 100644
--- a/drivers/pwm/pwm-imx-tpm.c
+++ b/drivers/pwm/pwm-imx-tpm.c
@@ -106,7 +106,9 @@ static int pwm_imx_tpm_round_state(struct pwm_chip *chip,
 	p->prescale = prescale;
 
 	period_count = (clock_unit + ((1 << prescale) >> 1)) >> prescale;
-	p->mod = period_count;
+	if (period_count == 0)
+		return -EINVAL;
+	p->mod = period_count - 1;
 
 	/* calculate real period HW can support */
 	tmp = (u64)period_count << prescale;
-- 
2.47.0

Hello,

On Fri, Oct 25, 2024 at 08:37:00AM +0000, Erik Schumacher wrote:
> The modulo register defines the period of the edge-aligned PWM mode
> (which is the only mode implemented). The reference manual states:
> "The EPWM period is determined by (MOD + 0001h) ..." So the value that
> is written to the MOD register must therefore be one less than the
> calculated period length. Return -EINVAL if the calculated length is
> already zero.
> A correct MODULO value is particularly relevant if the PWM has to output
> a high frequency due to a low period value.
> 
> Fixes: 738a1cfec2ed ("pwm: Add i.MX TPM PWM driver support")
> Cc: stable@vger.kernel.org
> Signed-off-by: Erik Schumacher <erik.schumacher@iris-sensing.com>

Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git pwm/fixes

I let it sit there for a few days to get some coverage in next and then
intend to send it to Linus for mainline inclusion ~ mid of next week.

Best regards
Uwe