Fan PWM monitoring and control
rgrs
rgrs at protonmail.com
Wed Sep 18 19:29:57 AEST 2019
Hi Patrick, Matt,
I tried instructions from this wiki: https://developer.ibm.com/linuxonpower/2019/01/07/how-to-port-openbmc/
There is no GPIO to detect presence of fans, so tach readings is used instead.
Here's what I did while trying to enable Fan control:
1. Added Fan tach sensor in hwmon (adt7462.conf) is in the form LABEL=FANx_RPM
2. "ipmi-sensor-inventory.yaml" has below config:
60: &fan_tach
sensorType: 0x04
path: /xyz/openbmc_project/sensors/fan_tach/FAN0_RPM
sensorReadingType: 0x01
multiplierM: 100
offsetB: 0
bExp: 0
unit: xyz.openbmc_project.Sensor.Value.Unit.RPMS
scale: 0
rExp: 0
serviceInterface: org.freedesktop.DBus.Properties
readingType: readingData
interfaces:
xyz.openbmc_project.Sensor.Value:
Value:
Offsets:
0xFF:
type: int64_t
and FAN PWM as
89: &fanpwm
sensorType: 0x04
path: /xyz/openbmc_project/sensors/fan_tach/FAN0_RPM
sensorReadingType: 0x01
multiplierM: 1
offsetB: 0
bExp: 0
mutability: Mutability::Write
serviceInterface: org.freedesktop.DBus.Properties
readingType: readingData
interfaces:
xyz.openbmc_project.Control.FanPwm:
Target:
Offsets:
0xFF:
type: uint64_t
3. I copied meta-romulus/recipes-phosphor/fans to my platform and changed FAN names from "fanx" to "FANx_RPM" in yaml files.
This is what get in busctl tree related to Fans:
(I expected to see FanPwm entries in busctl and I'm not sure why there are multiple entries in inventory).
Service xyz.openbmc_project.Hwmon-2429843755.Hwmon1:
`-/xyz
`-/xyz/openbmc_project
`-/xyz/openbmc_project/sensors
|-/xyz/openbmc_project/sensors/fan_tach
| |-/xyz/openbmc_project/sensors/fan_tach/FAN0_RPM
| |-/xyz/openbmc_project/sensors/fan_tach/FAN1_RPM
| |-/xyz/openbmc_project/sensors/fan_tach/FAN2_RPM
| `-/xyz/openbmc_project/sensors/fan_tach/FAN3_RPM
`-/xyz/openbmc_project/sensors/temperature
`-/xyz/openbmc_project/sensors/temperature/BACKPLANE_TEMP
Service xyz.openbmc_project.Inventory.Manager:
`-/xyz
`-/xyz/openbmc_project
`-/xyz/openbmc_project/inventory
`-/xyz/openbmc_project/inventory/system
`-/xyz/openbmc_project/inventory/system/chassis
`-/xyz/openbmc_project/inventory/system/chassis/motherboard
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN0
| `-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN0/FAN0
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN0_RPM
| `-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN0_RPM/FAN0_RPM
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN1
| `-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN1/FAN1
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN1_RPM
| `-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN1_RPM/FAN1_RPM
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN2
| `-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN2/FAN2
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN2_RPM
| `-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN2_RPM/FAN2_RPM
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN3
| `-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN3/FAN3
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN3_RPM
| `-/xyz/openbmc_project/inventory/system/chassis/motherboard/FAN3_RPM/FAN3_RPM
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/fan0
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/fan1
|-/xyz/openbmc_project/inventory/system/chassis/motherboard/fan2
`-/xyz/openbmc_project/inventory/system/chassis/motherboard/fan3
Thanks,
Raj
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Tuesday, September 17, 2019 9:18 PM, Patrick Venture <venture at google.com> wrote:
> On Tue, Sep 17, 2019 at 8:32 AM Matthew Barth msbarth at linux.ibm.com wrote:
>
> > On 9/17/19 5:40 AM, rgrs wrote:
> >
> > > Hi,
> > > I need some help with phosphor hwmon related to fan sensors.
> > > I'm trying to control Fans in a server motherboard using ADT7462
> > > controller. Hw mon porting is done and the sysfs interfaces are working
> > > as expected.
> > > While I am able to read RPM, i don't find pwm/target to control the fans
> > > exposed as dbus objects.
> > > Do you have the hwmon config set similar to this to denote the fan
> > > targets are of PWM type?
> >
> > https://github.com/openbmc/openbmc/blob/master/meta-ibm/meta-romulus/recipes-phosphor/sensors/phosphor-hwmon/obmc/hwmon/ahb/apb/pwm-tacho-controller%401e786000.conf
> >
> > > busctl --no-page tree xyz.openbmc_project.FanSensor
> > >
> > > ====================================================
> > >
> > > Failed to introspect object / of service xyz.openbmc_project.FanSensor:
> > > The name is not activatable
> > > No objects discovered.
> > > That does not look like a hwmon service name. If you are using
> > > phosphor-objmgr, you can use `# mapper get-service /xyz/openbmc_project/sensors/fan_tach` otherwise you'll need to find the
> > > hwmon service name associated with your fan controller device.
>
> running`busctl tree --no-pager` will just list everything, and you
> should see your fans in there. You can use the mapper too. I was
> curious, are you using entity-manager/dbus-sensors? When you mention
> FanSensor as the service, that's what it sounds like.
>
> > > I came across this post, I think it is similar to my issue.
> > > (https://gerrit.openbmc-project.xyz/c/openbmc/phosphor-hwmon/+/8353)
> > > Please someone point to latest documentation or reference Fan porting
> > > from openBMC repo?
> > > What are the exact fields in YAML that are used create FanPWM objects.
> > > The Romulus machine should be a good reference for PWM based fan control
> > > using phosphor-hwmon. It uses the
> > > phosphor-fan-presence/[control|monitor] apps for controlling and
> > > monitoring fans
> >
> > https://github.com/openbmc/openbmc/tree/master/meta-ibm/meta-romulus
> >
> > > (I'm using Feb release in my sandbox,
> > > https://github.com/openbmc/docs/blob/master/release/release-notes.md#26-feb-4-2019)
> > > Thanks,
> > > Raj
> >
> > Matt
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