mb/google/brya/var/taeko: Disable PCH USB2 phy power gating for taeko
The patch disables PCH USB2 Phy power gating to prevent possible display
flicker issue for taeko board. Please refer Intel doc#723158 for
more information.
BUG=b:241965786
TEST=Verify on taeko/tarlo boards.
Signed-off-by: Joey Peng <joey.peng@lcfc.corp-partner.google.com>
Change-Id: I03042906d5bea9b9010016adb98fbe68e2dc92f7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66582
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/mainboard/google/brya/variants/taeko/overridetree.cb b/src/mainboard/google/brya/variants/taeko/overridetree.cb
index 9a4de93..30aa355 100644
--- a/src/mainboard/google/brya/variants/taeko/overridetree.cb
+++ b/src/mainboard/google/brya/variants/taeko/overridetree.cb
@@ -44,6 +44,10 @@
end
end
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"
+
# Acoustic settings
register "acoustic_noise_mitigation" = "1"
register "slow_slew_rate[VR_DOMAIN_IA]" = "SLEW_FAST_8"