Re: [PATCH v3 2/2] hwmon: (pwm-fan) Introduce start from stopped state handling

[Guenter Roeck <linux@roeck-us.net>]

On Wed, Nov 06, 2024 at 07:59:05PM +0100, Marek Vasut wrote:
> Delta AFC0612DB-F00 fan has to be set to at least 30% PWM duty cycle
> to spin up from a stopped state, and can be afterward throttled down to
> lower PWM duty cycle. Introduce support for operating such fans which
> need to start at higher PWM duty cycle first and can slow down next.
> 
> Introduce two new DT properties, "fan-stop-to-start-percent" and
> "fan-stop-to-start-us". The former describes the minimum percent
> of fan RPM at which it will surely spin up from stopped state. This
> value can be found in the fan datasheet and can be converted to PWM
> duty cycle easily. The "fan-stop-to-start-us" describes the minimum
> time in microseconds for which the fan has to be set to stopped state
> start RPM for the fan to surely spin up.
> 
> Adjust the PWM setting code such that if the PWM duty cycle is below
> the minimum duty cycle needed by the fan to spin up from stopped state,
> then first set the PWM duty cycle to the minimum duty cycle needed
> by the fan to spin up from stopped state, then wait the time necessary
> for the fan to spin up from stopped state, and finally set the PWM duty
> cycle to the one desired by user.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>

Applied.

Thanks,
Guenter