witherspoon:Decrease VDN to .8v for power on

Per request of power team, reduce our VDN voltage from
.9v to .8v

Resolves openbmc/openbmc#1959

Change-Id: I3667aa256fc5c79d240adad1360879ced03c4ec6
Signed-off-by: Andrew Geissler <andrewg@us.ibm.com>
diff --git a/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/avsbus-control/power-workarounds.sh b/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/avsbus-control/power-workarounds.sh
index f98c408..51d3a9a 100644
--- a/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/avsbus-control/power-workarounds.sh
+++ b/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/avsbus-control/power-workarounds.sh
@@ -14,3 +14,11 @@
 i2cset -y 5 0x71 0x00 0x01
 i2cset -y 5 0x71 0x21 0x3B 0x01 i
 i2cset -y 5 0x71 0x00 0x00
+
+# VDN A - PGOOD_ON threshold
+i2cset -y 4 0x71 0x00 0x00 b # PAGE
+i2cset -y 4 0x71 0x5E 0xCD 0x00 i # set to 0.8V
+
+# VDN B - PGOOD_ON threshold
+i2cset -y 5 0x71 0x00 0x00 b # PAGE
+i2cset -y 5 0x71 0x5E 0xCD 0x00 i # set to 0.8V