From c3e36ea20b08abcd383d8788484e9f978d0569f2 Mon Sep 17 00:00:00 2001
From: Tony Huang <tony-huang@quanta.corp-partner.google.com>
Date: Mon, 12 Sep 2022 11:00:07 +0800
Subject: [PATCH] mb/google/dedede/variants/shotzo: Turn off LAN power in S0ix

Turn off the LAN power which is controlled by GPP_A10 in S0ix states.
For an USB device, the S0ix hook is needed for the on/off operationas
to take place.

BUG=b:245426120
BRANCH=firmware-dedede-13606.B
TEST=emerge-shotzo coreboot
     check LAN LED off in S0ix states
     check LAN function ok after suspending 500 loops
     check SSDT table has MS0X entry
     Scope (\_SB)
    {
        Method (MS0X, 1, Serialized)
        {
            If ((Arg0 == One))
            {
                \_SB.PCI0.CTXS (0x41)
            }
            Else
            {
                \_SB.PCI0.STXS (0x41)
            }
        }
    }

Change-Id: I3fcab4a73239b4f006839c0c81e9b4cc74047b77
Signed-off-by: Tony Huang <tony-huang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67528
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
---
 .../google/dedede/variants/shotzo/Makefile.inc      |  1 +
 .../google/dedede/variants/shotzo/variant.c         | 13 +++++++++++++
 2 files changed, 14 insertions(+)
 create mode 100644 src/mainboard/google/dedede/variants/shotzo/variant.c

diff --git a/src/mainboard/google/dedede/variants/shotzo/Makefile.inc b/src/mainboard/google/dedede/variants/shotzo/Makefile.inc
index eb2c9bc021..655f3c8473 100644
--- a/src/mainboard/google/dedede/variants/shotzo/Makefile.inc
+++ b/src/mainboard/google/dedede/variants/shotzo/Makefile.inc
@@ -1,3 +1,4 @@
 ## SPDX-License-Identifier: GPL-2.0-or-later
 
 ramstage-y += gpio.c
+ramstage-y += variant.c
diff --git a/src/mainboard/google/dedede/variants/shotzo/variant.c b/src/mainboard/google/dedede/variants/shotzo/variant.c
new file mode 100644
index 0000000000..05de15e98c
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/shotzo/variant.c
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpigen.h>
+#include <baseboard/variants.h>
+#include <variant/gpio.h>
+
+void variant_generate_s0ix_hook(enum s0ix_entry entry)
+{
+	if (entry == S0IX_ENTRY)
+		acpigen_soc_clear_tx_gpio(GPP_A10);
+	else if (entry == S0IX_EXIT)
+		acpigen_soc_set_tx_gpio(GPP_A10);
+}