[S] Change in coreboot[master]: mb/google/skyrim/var/winterhold: adjust the eDP panel power sequence

[Chris Wang (Code Review)]

Attention is currently required from: Jason Nien, Martin Roth.

Chris Wang has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/74790 )

Change subject: mb/google/skyrim/var/winterhold: adjust the eDP panel power sequence
......................................................................

mb/google/skyrim/var/winterhold: adjust the eDP panel power sequence

set Set edp_panel_t9_ms to 8ms which means it  will delay 8ms
between backlight off  and vary backlight off.

BUG=b:271704149
BRANCH=none
TEST=Build; Verify the UPD was passed to system integrated table;

Signed-off-by: Chris Wang 
Change-Id: I952d05b18e29cf30256f43562a5052007c5c6268
---
M src/mainboard/google/skyrim/variants/winterhold/overridetree.cb
1 file changed, 18 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/90/74790/1

diff --git a/src/mainboard/google/skyrim/variants/winterhold/overridetree.cb b/src/mainboard/google/skyrim/variants/winterhold/overridetree.cb
index 2e32b28..d8603b7 100644
--- a/src/mainboard/google/skyrim/variants/winterhold/overridetree.cb
+++ b/src/mainboard/google/skyrim/variants/winterhold/overridetree.cb
@@ -114,6 +114,7 @@

# The unit is set to one per ms
    	register "edp_panel_t8_ms" = "112"
+		register "edp_panel_t9_ms" = "8"

device ref gpp_bridge_1 on
    		# Required so the NVMe gets placed into D3 when entering S0i3.