Increase AVDD on witherspoon
Per request of power team, adding an AVDD override to
our power on sequence
Resolves openbmc/openbmc#2112
Change-Id: I82478e6f3eb30a108c4e7332369d36568e425315
Signed-off-by: Andrew Geissler <andrewg@us.ibm.com>
diff --git a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/avsbus-control/power-workarounds.sh b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/avsbus-control/power-workarounds.sh
index 51d3a9a..6c11caa 100644
--- a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/avsbus-control/power-workarounds.sh
+++ b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/avsbus-control/power-workarounds.sh
@@ -22,3 +22,36 @@
# 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
+
+# unbind ucd driver to permit i2cset
+ucd_retries=5
+ucd=
+
+ucdpath="/sys/bus/i2c/drivers/ucd9000"
+if [ -e $ucdpath ]
+then
+ ucd=`ls -1 $ucdpath | grep 64`
+ if [ -n "$ucd" ]
+ then
+ echo $ucd > $ucdpath/unbind
+ fi
+fi
+
+# Raise AVDD +100mV
+i2cset -y 11 0x64 0x00 0x09 i # set PAGE
+i2cset -y 11 0x64 0xF5 0x81 i # set margin_config
+i2cset -y 11 0x64 0x21 0x85 0x33 i # set VOUT_COMMAND
+
+# re-bind ucd driver only if we unbound it (i.e. ucd has been set with a value)
+if [ -e $ucdpath -a -n "$ucd" ]; then
+ j=0
+ until [ $j -ge $ucd_retries ] || [ -e $ucdpath/$ucd ]; do
+ j=$((j+1))
+ echo $ucd > $ucdpath/bind || ret=$?
+ if [ $j -gt 1 ]; then
+ echo "rebinding UCD driver. Retry number $j"
+ sleep 1
+ fi
+ done
+ if [ ! -e $ucdpath/$ucd ]; then exit $ret; fi
+fi