From 4b5a98d8d597250692d11b3a17e8448fea77d8f0 Mon Sep 17 00:00:00 2001 From: Ren Kuo Date: Wed, 22 Jun 2022 16:08:40 +0800 Subject: [PATCH] mb/google/brya/var/volmar: Disable PCH USB2 phy power gating The patch disables PCH USB2 Phy power gating to prevent possible display flicker issue for kano board. Please refer Intel doc#723158 for more information. BUG=None TEST=Verify the build for volmar board Signed-off-by: Ren Kuo Change-Id: I4d12f7214a306ded54b4536a27fe0fb7f3c33b8b Reviewed-on: https://review.coreboot.org/c/coreboot/+/65307 Tested-by: build bot (Jenkins) Reviewed-by: Tim Wawrzynczak --- src/mainboard/google/brya/variants/volmar/overridetree.cb | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/mainboard/google/brya/variants/volmar/overridetree.cb b/src/mainboard/google/brya/variants/volmar/overridetree.cb index 8ebb94cfd8..aca32f83b4 100644 --- a/src/mainboard/google/brya/variants/volmar/overridetree.cb +++ b/src/mainboard/google/brya/variants/volmar/overridetree.cb @@ -23,6 +23,10 @@ end 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 "usb2_phy_sus_pg_disable" = "1" + register "tcss_aux_ori" = "1" register "typec_aux_bias_pads[0]" = "{.pad_auxp_dc = GPP_E22, .pad_auxn_dc = GPP_E23}"