Change in coreboot[master]: mb/google/dedede/var/lantis: Add FW_CONFIG probe for EXT_VR

[Tony Huang (Code Review)]

Tony Huang has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/63076 )

Change subject: mb/google/dedede/var/lantis: Add FW_CONFIG probe for EXT_VR
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mb/google/dedede/var/lantis: Add FW_CONFIG probe for EXT_VR

Add FW_CONFIG probe for don't stuffing Anpec APW8738 VNN power IC.
If removed the VNN power IC then "disable_external_bypass_vr" should be set to "1" to disable.

BUG=b:223687184
BRANCH=dedede
TEST=test for enter S0ix and resume normally by powerd_dbus_suspend

Change-Id: I6c21c416c5ca56fd06ed162d7ae37f0a094176e1
Signed-off-by: Tony Huang 
---
A src/mainboard/google/dedede/variants/lantis/Makefile.inc
A src/mainboard/google/dedede/variants/lantis/ramstage.c
2 files changed, 21 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/76/63076/1

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 0000000..2a9206c
--- /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 0000000..580e6bf
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/lantis/ramstage.c
@@ -0,0 +1,18 @@
+/* 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();
+}