mb/google/volteer/variants/delbin: Disable PmcUsb2PhySusPgEnable
eDP panel flicker during system idle state is observed.
Disabling USB2 SUS well power gating can remove flicker symptom.
Please refer to doc#634894 for more details.
BUG=b:182323059
BRANCH=None
TEST=Boot and confirm no display flicker.
Signed-off-by: Ravi Sarawadi <ravishankar.sarawadi@intel.com>
Change-Id: Icadf9c494fab82b219317c3ca3b04f633b543083
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51613
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
diff --git a/src/mainboard/google/volteer/variants/delbin/overridetree.cb b/src/mainboard/google/volteer/variants/delbin/overridetree.cb
index 5e9600b..c111731 100644
--- a/src/mainboard/google/volteer/variants/delbin/overridetree.cb
+++ b/src/mainboard/google/volteer/variants/delbin/overridetree.cb
@@ -2,6 +2,8 @@
register "DdiPort1Hpd" = "0"
register "DdiPort2Hpd" = "0"
+ register "usb2_phy_sus_pg_disable" = "1"
+
#+-------------------+---------------------------+
#| Field | Value |
#+-------------------+---------------------------+