Enable/Disable some sensors when Host On/Off

[Thu Ba Nguyen]

On Tue, Oct 20, 2020 at 8:46 PM Matt Spinler <mspinler at linux.ibm.com> wrote:

>
>
> On 10/19/2020 10:23 AM, Thu Ba Nguyen wrote:
> > Thanks for your reply Matt Spinler, Can you show me the discussion
> > threads? I also...
> > This Message Is From an External Sender
> > This message came from outside your organization.
> >
> > Thanks for your reply Matt Spinler,
> >
> > Can you show me the discussion threads?
>
> Sure: https://lists.ozlabs.org/pipermail/openbmc/2019-October/018967.html
>
> >
> > I also thought about the solution for that features:
> > In the current hwmon we support GPIOCHIP + GPIO option which used to
> > enable sensors to read. In the hwmon code, we just set that pin and
> > wait before reading.
> > I think we can support a similar option named GPIOENABLE + GPIOV. When
> > the status of Gpio pin defind in GPIOEANBLE match with GPIOV.
> > That sensors will be read and update to Dbus.
> > If not it will be removed from DBus until the GPIO pin math GPIOV.
> > Maybe we can have many different solutions.
>
> As Ed mentioned, I think a good direction to start with is how
> dbus-sensors handles it, so we  can have
> common behavior.  I believe they look at the host state D-Bus property
> and still keep the sensor
> on D-Bus even when power is off.
>

[Thu] Yah, I think  using the host state D-Bus property to verify host
state.
Then handling the host sensors based on this status is a better solution.
Keeping the sensors on Dbus can cause the value or the status of
warning/critical value of sensors
is out update. I expected that the host sensors will be removed from Dbus
when the host is off.

>
> > If you don't mind, can you tell me how IBM supports that features?
>
> We lucked out out in that the driver was only loaded when power was on.
>
[Thu] What will be displayed when you open health --> sensors page in
OpenBmc web?
Are the host sensors still there and value is "na" or some things like that?

>
> >
> > Regards.
> > Thu Nguyen.
> >
> > On Mon, Oct 19, 2020 at 9:16 PM Matt Spinler <mspinler at linux.ibm.com
> > <mailto:mspinler at linux.ibm.com>> wrote:
> >
> >
> >
> >     On 10/18/2020 8:58 AM, Thu Ba Nguyen wrote:
> >     > Dear, I'm supporting the host sensors for Ampere Computing LLC
> >     > platform. We are...
> >     > This Message Is From an External Sender
> >     > This message came from outside your organization.
> >     >
> >     > Dear,
> >     >
> >     > I'm supporting the host sensors for Ampere Computing LLC platform.
> >     > We are using phosphor-hwmon to update values of sensors and
> >     monitoring
> >     > sensors warning/errors base on threshold setting.
> >     >
> >     > There are some sensors which are turned off when host Off. It
> >     can be
> >     > the sensors reported by host or voltage/temperature/power sensors
> >     >  which use the same power source with host.
> >     >
> >     > I researched in openBmc sensor-architecture documents but can't
> >     find
> >     > any option to enable/disable sensors base on one status or GPIO
> >     pins.
> >     > I can't use REMOVERCS.
> >     >
> >     > Research in phosphor-hwmon code, I don't see the answer too.
> >     >
> >     > Do we have any options/solution to Enable/Disable some sensors when
> >     > Host On/Off?
> >
> >     Hi,
> >     The phosphor-hwmon code doesn't support that yet.  It has been
> >     discussed
> >     before but nobody
> >     has implemented it.
> >
> >     >
> >     > Thanks.
> >     > Thu Nguyen.
> >
>
>
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