IMX 8ULP : PWM buzzer showing delayed sound output after giving variable frequencies

[Namitha_zcs]

I am working on the i.MX8ULP platform using Linux BSP version 6.6, built with the Yocto Project. For implementing the buzzer functionality, I used the "fsl,imx7ulp-pwm"driver. However, there is an issue when setting different frequencies-the buzzer sound is generated only after a significant delay (more than 2 minutes). In contrast, when using a fixed frequency and varying only the duty cycle, the buzzer output works as expected.

[AldoG]

Hello,

Could you share how are you changing the frequency?
Is it directly using the device tree?

Best regards/Saludos,
Aldo.

[Namitha_zcs]

Hi AldoG ,
I am changing the frequency dynamically from the user space. I am attaching sreenshot for your reference.

Best Regards,
Namitha K Nair

[Namitha_zcs]

I wanted to follow up on the issue I raised earlier. As I’m currently working under a tight schedule, I would greatly appreciate any updates or guidance to the solution.