mb/google/brya/var/gimble: Disable PCH USB2 phy power gating
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:237421399
TEST=Verify the build for gimble board
Signed-off-by: Mark Hsieh <mark_hsieh@wistron.corp-partner.google.com>
Change-Id: Ie66c9679c985215ad7f1a5ae76560b839ea95702
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65474
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/brya/variants/gimble/overridetree.cb b/src/mainboard/google/brya/variants/gimble/overridetree.cb
index 07458e9..a149c33 100644
--- a/src/mainboard/google/brya/variants/gimble/overridetree.cb
+++ b/src/mainboard/google/brya/variants/gimble/overridetree.cb
@@ -31,6 +31,10 @@
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"
+
register "typec_aux_bias_pads[0]" = "{.pad_auxp_dc = GPP_E22, .pad_auxn_dc = GPP_E23}"
register "usb2_ports[1]" = "USB2_PORT_MAX_TYPE_C(OC1)" # set MAX to USB2_C1 for eye diagram
register "usb2_ports[2]" = "USB2_PORT_EMPTY" # Disable USB2_C2