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When system only uses single PSU ( ex : PSU1 ) to power ON normal 12V,
HSC2 will be trigged Fault event (FET health).
At this time, plugging in PSU2 in system, the PSU2 won't deliver power to
+12V_MB because HSC2 is protected by Fault event.
Due to HSC2 protected, the PSU redundancy mechanism can't be created.
Once PSU1 is plugged out at this moment, system will crash ( reset )
because +12V_MB dropped.
Support detecting PSU plug event and reset the Hot-Swap feature by
disabling and then enabling again it through PMBUS command to clear the
event.
Tested:
1. Plug only PSU1 to power ON system (12V)
2. Wait until host is booted, check POUT:
$ ipmitool sdr | grep "POUT"
PSU1_POUT | 112 Watts | ok
PSU2_POUT | 0 Watts | ok
3. Plug in PSU2 in system, check POUT:
$ ipmitool sdr | grep "POUT"
PSU1_POUT | 64 Watts | ok
PSU2_POUT | 48 Watts | ok
4. Unplug AC power PSU1, check POUT:
$ ipmitool sdr | grep "POUT"
PSU1_POUT | 0 Watts | ok
PSU2_POUT | 128 Watts | ok
5. Plug in AC power PSU1, check POUT:
$ ipmitool sdr | grep "POUT"
PSU1_POUT | 80 Watts | ok
PSU2_POUT | 64 Watts | ok
6. Repeat 1. to 5. with PSU2.
Signed-off-by: Chanh Nguyen <chanh@os.amperecomputing.com>
Change-Id: Ia6e00cd7b08de48059f2450e7eaf108418d0a026
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