meta-ampere: Support software workaround for PSU redundancy issue

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

1 files changed, 6 insertions, 0 deletions

diff --git a/meta-ampere/meta-jade/recipes-phosphor/gpio/psu-hotswap-reset/psu1_hotswap_reset.service b/meta-ampere/meta-jade/recipes-phosphor/gpio/psu-hotswap-reset/psu1_hotswap_reset.service
new file mode 100644
index 000000000..fec3ad6a2
--- /dev/null
+++ b/meta-ampere/meta-jade/recipes-phosphor/gpio/psu-hotswap-reset/psu1_hotswap_reset.service
@@ -0,0 +1,6 @@
+[Unit]
+Description=Ampere Computing LLC PSU1 reset hotswap
+
+[Service]
+Restart=no
+ExecStart=ampere_psu_reset_hotswap.sh 1