From bed947368cf196c4e0452b5214d5528f47789995 Mon Sep 17 00:00:00 2001
From: Sean Rhodes <sean@starlabs.systems>
Date: Fri, 16 Sep 2022 09:38:08 +0100
Subject: mb/starlabs/lite: Reset XHCI before entering S5

Reset the XHCI controller prior to S5 to avoid XHCI preventing shutdown.
Linux needs to put the XHCI into D3 before shutting down but the
powerstate commands do not perform a reset.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I3be70443eb85a7dff8055c9de0ca2fd89f4fc88d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67678
Reviewed-by: Tim Wawrzynczak <inforichland@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 src/mainboard/starlabs/lite/smihandler.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 src/mainboard/starlabs/lite/smihandler.c

diff --git a/src/mainboard/starlabs/lite/smihandler.c b/src/mainboard/starlabs/lite/smihandler.c
new file mode 100644
index 0000000000..75e84c76e2
--- /dev/null
+++ b/src/mainboard/starlabs/lite/smihandler.c
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpi.h>
+#include <cpu/x86/smm.h>
+#include <intelblocks/xhci.h>
+
+void mainboard_smi_sleep(u8 slp_typ)
+{
+	/*
+	 * Workaround: Reset the XHCI controller prior to S5 to avoid
+	 * XHCI preventing shutdown. Linux needs to put the XHCI into D3
+	 * before shutting down but the powerstate commands do not
+	 * perform a reset.
+	 */
+	if (slp_typ == ACPI_S5)
+		xhci_host_reset();
+}
-- 
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