From febcc020fd1d375634f535b488e1c3747a7621fd Mon Sep 17 00:00:00 2001
From: Frank Wu <frank_wu@compal.corp-partner.google.com>
Date: Mon, 16 Jan 2023 13:36:52 +0800
Subject: [PATCH] mb/google/skyrim/var/frostflow: set dxio_tx_vboost_enable

Turn on the dxio_tx_vboost_enable for frostflow in coreboot.

It needs to confirm the PCIe Signal Integrity after enabled.

BUG=b:259007881, b:248221908
BRANCH=none
TEST=emerge-skyrim coreboot chromeos-bootimage

Signed-off-by: Frank Wu <frank_wu@compal.corp-partner.google.com>
Change-Id: Iaac331737c83ac7a4a1261c32151359e126a009e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71926
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Dtrain Hsu <dtrain_hsu@compal.corp-partner.google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
---
 src/mainboard/google/skyrim/variants/frostflow/overridetree.cb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mainboard/google/skyrim/variants/frostflow/overridetree.cb b/src/mainboard/google/skyrim/variants/frostflow/overridetree.cb
index 158c5adb78..bfbaeac4e6 100644
--- a/src/mainboard/google/skyrim/variants/frostflow/overridetree.cb
+++ b/src/mainboard/google/skyrim/variants/frostflow/overridetree.cb
@@ -27,6 +27,9 @@ chip soc/amd/mendocino
 	}"
 
 	device domain 0 on
+
+		register "dxio_tx_vboost_enable" = "1"
+
 		device ref gpp_bridge_a on  # Internal GPP Bridge 0 to Bus A
 			device ref xhci_1 on # XHCI1 controller
 				chip drivers/usb/acpi