PS_VDD_FAN_DISABLE on carrier board - why?

Can anyone please enlighten me - why is there a dedicated signal to disable the fan?
Isn’t the effect the same as configuring FAN_PWM as TEGRA_PIN_PULL_DOWN?

Is there some power saving benefit I do not see? Maybe in sleep mode?

Hi, it is to reduce software effort and enhance robust. The fan control logic setting is the PWM output always following the CPU temperature, so it is easy to cause unknown risk to use PWM to disable fan.