[S] Change in coreboot[master]: mb/google/brya/var/skolas: disable Tccold Handshake

[Selma Bensaid (Code Review)]

Selma Bensaid has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/68636 )

Change subject: mb/google/brya/var/skolas: disable Tccold Handshake
......................................................................

mb/google/brya/var/skolas: disable Tccold Handshake

The patch disables Tccold Handshake to prevent possible display
flicker issue for skolas board. Please refer Intel doc#723158 for
more information.

BUG=b:221461379
TEST=Verify the build for skolas board

Signed-off-by: Selma Bensaid 
Change-Id: Ic184a61c27abd729667cd181d8f9954f58b67856
---
M src/mainboard/google/brya/variants/skolas/overridetree.cb
M src/mainboard/google/brya/variants/skolas4es/overridetree.cb
2 files changed, 25 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/36/68636/1

diff --git a/src/mainboard/google/brya/variants/skolas/overridetree.cb b/src/mainboard/google/brya/variants/skolas/overridetree.cb
index 110ca42..efd823c 100644
--- a/src/mainboard/google/brya/variants/skolas/overridetree.cb
+++ b/src/mainboard/google/brya/variants/skolas/overridetree.cb
@@ -46,6 +46,10 @@
 chip soc/intel/alderlake
    register "sagv" = "SaGv_Enabled"

+	# As per Intel Advisory doc#723158, the change is required to prevent possible
+	# display flickering issue.
+	register "disable_dynamic_tccold_handshake" = "1"
+
    register "platform_pmax" = "145"

register "usb2_ports[7]" = "USB2_PORT_MID(OC_SKIP)"	# Type-A MLB Port
diff --git a/src/mainboard/google/brya/variants/skolas4es/overridetree.cb b/src/mainboard/google/brya/variants/skolas4es/overridetree.cb
index 1a91779..f4f3158 100644
--- a/src/mainboard/google/brya/variants/skolas4es/overridetree.cb
+++ b/src/mainboard/google/brya/variants/skolas4es/overridetree.cb
@@ -41,6 +41,10 @@

chip soc/intel/alderlake
    register "sagv" = "SaGv_Enabled"
+	
+	# As per Intel Advisory doc#723158, the change is required to prevent possible
+	# display flickering issue.
+	register "disable_dynamic_tccold_handshake" = "1"

register "platform_pmax" = "145"