tree c78aba2863d32ec2534b9b9b2487fd5d22c8f5bc
parent 23c96e7c249b41efecc10ba7acba82603a54b996
author Zhikui Ren <zhikui.ren@intel.com> 1602535328 -0700
committer Zhikui Ren <zhikui.ren@intel.com> 1608079727 -0800

Correct ADC sensors max reading

Set ADC max reading to be reference voltage 1.8Volt.
Calculate maxReading from it. This fixes threshold hysteresis.

Tested:
Use sensor override to trigger alarm and verify that
de-assert happens when sensor reading back to normal.
Without the change, the de-assert never happens.
Example:
    busctl set-property xyz.openbmc_project.ADCSensor /xyz/openbmc_project/sensors/voltage/ABC_CPU1 xyz.openbmc_project.Sensor.Value Value d 1.348
    intel-obmc adcsensor[412]: Sensor ABC_CPU1 high threshold 1.301 assert: value 1.348 raw data 1244
    intel-obmc adcsensor[412]: Sensor ABC_CPU1 high threshold 1.263 assert: value 1.348 raw data 1244
    intel-obmc ipmid[242]: thresholdChanged: Assert
    intel-obmc ipmid[242]: thresholdChanged: Assert
    intel-obmc sel-logger[288]: ABC_CPU1 sensor crossed a critical high threshold going high. Reading=1.348000 Threshold=1.301000.
    intel-obmc sel-logger[288]: ABC_CPU1 sensor crossed a warning high threshold going high. Reading=1.348000 Threshold=1.263000.
    intel-obmc ipmid[242]: thresholdChanged: deassert
    intel-obmc ipmid[242]: thresholdChanged: deassert
    intel-obmc sel-logger[288]: ABC_CPU1 sensor crossed a critical high threshold going low. Reading=1.244000 Threshold=1.301000.
    intel-obmc sel-logger[288]: ABC_CPU1 sensor crossed a warning high threshold going low. Reading=1.244000 Threshold=1.263000.

Also ran "ipmitool sensor list" and varified ADCSensor values are correct
    A P12V PSU SCALE | 12.096     | Volts      | ok    | na        | 10.647    | 10.962    | 13.104    | 13.482    | na
    P1V8 PCH         | 1.805      | Volts      | ok    | na        | 1.645     | 1.701     | 1.908     | 1.965     | na
    P3V3             | 3.320      | Volts      | ok    | na        | 2.976     | 3.062     | 3.543     | 3.646     | na
    P3VBAT           | 3.074      | Volts      | ok    | na        | 2.141     | 2.459     | 3.265     | 3.286     | na
    P12V AUX         | 12.096     | Volts      | ok    | na        | 10.647    | 10.962    | 13.104    | 13.482    | na
    P105 PCH AUX     | 1.058      | Volts      | ok    | na        | 0.966     | 0.994     | 1.108     | 1.136     | na
    PVCCIN CPU1      | 1.824      | Volts      | ok    | na        | 1.372     | 1.419     | 2.087     | 2.153     | na
    PVCCIO CPU1      | 1.030      | Volts      | ok    | na        | 0.731     | 0.753     | 1.157     | 1.193     | na
    PVDQ ABC CPU1    | 1.243      | Volts      | ok    | na        | 1.101     | 1.136     | 1.264     | 1.299     | na
    PVDQ DEF CPU1    | 1.243      | Volts      | ok    | na        | 1.101     | 1.136     | 1.264     | 1.299     | na
    PVNN PCH AUX     | 0.902      | Volts      | ok    | na        | 0.781     | 0.809     | 1.051     | 1.079     | na

Signed-off-by: Zhikui Ren <zhikui.ren@intel.com>
Change-Id: If0dd132f963253172862d1b5e2b96c3bbedcdfd4