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Subject: Re:  openBMC pwm-fan control policy
From: Andrei Kartashev <a.kartashev@yadro.com>
To: Landon <cld795@163.com>, "fercerpav@gmail.com" <fercerpav@gmail.com>
Date: Mon, 29 Nov 2021 13:22:05 +0300
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Hello,

Please read phosphor-pid-control documentation:
https://github.com/openbmc/phosphor-pid-control
https://github.com/openbmc/phosphor-pid-control/blob/master/configure.md
https://github.com/openbmc/phosphor-pid-control/blob/master/tuning.md
https://github.com/openbmc/phosphor-pid-control/tree/master/examples

Keep in mind that there are two different ways to configure phosphor-
pid-control: statically with JSON config files and dynamically with
DBUS (generally, using EntityManager JSON configuration) and same
parameters with this two ways mostly have different names.
The way you want to use is generally depend on either you use EM for
your platform or not.

On Mon, 2021-11-29 at 17:43 +0800, Landon wrote:
>  Thank you!  
> I have read it
> :  https://github.com/openbmc/entity-manager/blob/master/configurations/R1000%20Chassis.json
> But I don't understand,
> Is there an explanation for this part?
> Are there general instructions on how to control fan output by
> temperature?
> 
> and how to use phosphor-pid-control  to set this ?
>  
> Is there“ phosphor-pid-control ”the instructions for this part?
> Thank you very much !
> On 11/27/2021 05:57，Paul Fertser<fercerpav@gmail.com> wrote： 
> > On Fri, Nov 26, 2021 at 01:55:31PM +0800, Landon wrote:
> >  
> > > add: I just want to know in  OpenBMC by reading different
> > > temperature values  or
> > >  current values to  control the fan  output, so as  to cool down,
> > >  how does  this
> > >  strategy work? An example of this.
> > 
> > This is using temperature values to control the fans so as to cool
> > down, it works by configuring phosphor-pid-control appropriately, I
> > hope it's enough of an example:
> > 
> > https://github.com/openbmc/entity-
> > manager/blob/master/configurations/R1000%20Chassis.json
> > 
> > If you think phosphor-pid-control is missing some documentation
> > please
> > read its source code and send documentation patches for review.
> > 

-- 
Best regards,
Andrei Kartashev