mb/google/brya: Disable PCH USB2 phy power gating for crota
The patch disables PCH USB2 Phy power gating to prevent possible display
flicker issue for primus board. Please refer Intel doc#723158 for
more information.
BUG=b:237725329
TEST=Verify the build for crota board
Signed-off-by: Terry Chen <terry_chen@wistron.corp-partner.google.com>
Change-Id: I6dde74c098ba57b7cd66ce7b9ee941b8961ad20c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65594
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Cyan Yang <cyan.yang@intel.corp-partner.google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/mainboard/google/brya/variants/crota/overridetree.cb b/src/mainboard/google/brya/variants/crota/overridetree.cb
index 2e51d40..e958b68 100644
--- a/src/mainboard/google/brya/variants/crota/overridetree.cb
+++ b/src/mainboard/google/brya/variants/crota/overridetree.cb
@@ -29,6 +29,10 @@
register "fast_pkg_c_ramp_disable[VR_DOMAIN_IA]" = "1"
register "fast_pkg_c_ramp_disable[VR_DOMAIN_GT]" = "1"
+ # As per Intel Advisory doc#723158, the change is required to prevent possible
+ # display flickering issue.
+ register "usb2_phy_sus_pg_disable" = "1"
+
# Intel Common SoC Config
#+-------------------+---------------------------+
#| Field | Value |