[S] Change in coreboot[master]: mb/google/brask: Disable PCH USB2 phy power gating for brask

[Ricky Chang (Code Review)]

Ricky Chang has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/69272 )

Change subject: mb/google/brask: Disable PCH USB2 phy power gating for brask
......................................................................

mb/google/brask: Disable PCH USB2 phy power gating for brask

The patch disables PCH USB2 Phy power gating to prevent possible display
flicker issue for moli board. Please refer Intel doc#723158 for
more information.

BUG=b:257415959
TEST=Verify the build for brask board

Change-Id: I518e90e9032e8f2186300b6b907cc9d84a1682e4
---
M src/mainboard/google/brya/variants/baseboard/brask/devicetree.cb
1 file changed, 19 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/72/69272/1

diff --git a/src/mainboard/google/brya/variants/baseboard/brask/devicetree.cb b/src/mainboard/google/brya/variants/baseboard/brask/devicetree.cb
index 0d60a57..29fb5d0 100644
--- a/src/mainboard/google/brya/variants/baseboard/brask/devicetree.cb
+++ b/src/mainboard/google/brya/variants/baseboard/brask/devicetree.cb
@@ -1,4 +1,7 @@
 chip soc/intel/alderlake
+	# As per Intel Advisory doc#723158, the change is required to prevent possible
+	# display flickering issue.
+	register "usb2_phy_sus_pg_disable" = "1"

# GPE configuration
    register "pmc_gpe0_dw0" = "GPP_A"