[S] Change in coreboot[master]: [TEST] Shotzo cut off USB LAN power

[Tony Huang (Code Review)]

Tony Huang has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/67366 )

Change subject: [TEST] Shotzo cut off USB LAN power
......................................................................

[TEST] Shotzo cut off USB LAN power

Change-Id: I252a4e285e65530cfde5bd07d6e1c5971c4f971b
Signed-off-by: Tony Huang 
---
M src/mainboard/google/dedede/dsdt.asl
A src/mainboard/google/dedede/mainboard.asl
2 files changed, 35 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/66/67366/1

diff --git a/src/mainboard/google/dedede/dsdt.asl b/src/mainboard/google/dedede/dsdt.asl
index 56812d5..85e6b6b 100644
--- a/src/mainboard/google/dedede/dsdt.asl
+++ b/src/mainboard/google/dedede/dsdt.asl
@@ -19,6 +19,7 @@
    #include <cpu/intel/common/acpi/cpu.asl>

Scope (_SB) {
+		#include "mainboard.asl"
    	Device (PCI0)
    	{
    		#include <soc/intel/common/block/acpi/acpi/northbridge.asl>
diff --git a/src/mainboard/google/dedede/mainboard.asl b/src/mainboard/google/dedede/mainboard.asl
new file mode 100644
index 0000000..6c0345d
--- /dev/null
+++ b/src/mainboard/google/dedede/mainboard.asl
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#include <baseboard/gpio.h>
+#if CONFIG(BOARD_GOOGLE_SHOTZO)
+/*
+ * S0ix Entry/Exit Notifications
+ * Called from _SB.PEPD._DSM
+ */
+Method (MS0X, 1, Serialized)
+{
+	If (Arg0 == 1) {
+		/*
+		 * On S0ix entry, clear the SLP_S0_GATE pin, so that the rest of
+		 * the platform can transition to its low power state as well.
+		 */
+		_SB.PCI0.CTXS(GPP_A10);
+	} Else {
+		/*
+		 * On S0ix exit, set the SLP_S0_GATE pin, so that the rest of
+		 * the platform will resume from its low power state.
+		 */
+		_SB.PCI0.STXS(GPP_A10);
+	}
+}
+#endif