From a6c94332ba1da021bb34a46e7c61265d445f6766 Mon Sep 17 00:00:00 2001
From: Robert Chen <robert.chen@quanta.corp-partner.google.com>
Date: Fri, 25 Mar 2022 16:42:16 +0800
Subject: [PATCH] mb/google/dedede/var/lantis: Add FW_CONFIG probe for EXT_VR

Add FW_CONFIG probe for absent ANPEC APW8738BQBI IC on lantis.

BUG=b:223687184
TEST=emerge-dedede coreboot

Signed-off-by: Robert Chen <robert.chen@quanta.corp-partner.google.com>
Change-Id: I3d8eec1d2f962d42f3be225eef8498e8b722aace
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63112
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Shou-Chieh Hsu <shouchieh@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
---
 .../google/dedede/variants/lantis/Makefile.inc  |  3 +++
 .../google/dedede/variants/lantis/ramstage.c    | 17 +++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 src/mainboard/google/dedede/variants/lantis/Makefile.inc
 create mode 100644 src/mainboard/google/dedede/variants/lantis/ramstage.c

diff --git a/src/mainboard/google/dedede/variants/lantis/Makefile.inc b/src/mainboard/google/dedede/variants/lantis/Makefile.inc
new file mode 100644
index 0000000000..2a9206c2b6
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/lantis/Makefile.inc
@@ -0,0 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-or-later
+
+ramstage-y += ramstage.c
diff --git a/src/mainboard/google/dedede/variants/lantis/ramstage.c b/src/mainboard/google/dedede/variants/lantis/ramstage.c
new file mode 100644
index 0000000000..255e58557e
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/lantis/ramstage.c
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/variants.h>
+#include <fw_config.h>
+#include <soc/soc_chip.h>
+
+static void ext_vr_update(void)
+{
+	struct soc_intel_jasperlake_config *cfg = config_of_soc();
+	if (fw_config_probe(FW_CONFIG(EXT_VR, EXT_VR_ABSENT)))
+		cfg->disable_external_bypass_vr = 1;
+}
+
+void variant_devtree_update(void)
+{
+	ext_vr_update();
+}