Does it make sense to create a centralized fan control module?

Heyi Guo guoheyi at
Fri Jun 11 11:23:40 AEST 2021

Please ignore my early emails; only this one is the final version. I 
must have misused some shortcut key to send the unfinished versions 
while I wanted to save it locally...

Sorry for the noise.


On 2021/6/11 上午9:14, Heyi Guo wrote:
> Hi All,
> Right now fan related data like tacho and PWM is fetched in 
> dbus-sensors, and published to d-bus as sensor data, while fan control 
> is made in another module like pid-control, which can fetch data and 
> set value via d-bus.
> In some common sense, we may think about putting all fan related work 
> into one single module (which may be based on pid-control), i.e. it 
> can read tacho and PWM from hardware directly, calculate the required 
> PWM by some algorithm like PID, and then write to PWM hardware 
> directly; the data will also be published to d-bus for other modules 
> to consume, like fansensor from dbus-sensors.
> Does it make sense to do that? Or is there any reason for the current 
> design?
> I'm new to OpenBMC and some of my understanding may be totally wrong.
> Looking forward to your expert advice.
> Thanks,
> Heyi

More information about the openbmc mailing list