From cf7460f6ea72327d509951f50c712b4870eb253a Mon Sep 17 00:00:00 2001
From: Cong Yang <yangcong5@huaqin.corp-partner.google.com>
Date: Fri, 17 Jan 2025 12:51:12 +0800
Subject: [PATCH] mb/google/skywalker: Enable USB3_HUB_RST

We have to reset the USB hub as early as possible. Otherwise the USB3
hub may not be usable in the payload. This design has been introduced
since Cherry.

BUG=b:390357201
BRANCH=none
TEST=detect USB devices in depthcharge, and the log is like "Added USB
disk 2."

Change-Id: I4ee24aef2a887c8a30738912a8bf90f830a72bed
Signed-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87348
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
---
 src/mainboard/google/skywalker/bootblock.c | 9 +++++++++
 src/mainboard/google/skywalker/gpio.h      | 1 +
 2 files changed, 10 insertions(+)

diff --git a/src/mainboard/google/skywalker/bootblock.c b/src/mainboard/google/skywalker/bootblock.c
index 1062d9bbe5..71c3dfc418 100644
--- a/src/mainboard/google/skywalker/bootblock.c
+++ b/src/mainboard/google/skywalker/bootblock.c
@@ -1,9 +1,18 @@
 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
 
 #include <bootblock_common.h>
+#include <gpio.h>
 #include <soc/spi.h>
 
+#include "gpio.h"
+
+static void usb3_hub_reset(void)
+{
+	gpio_output(GPIO_USB3_HUB_RST_L, 1);
+}
+
 void bootblock_mainboard_init(void)
 {
 	mtk_snfc_init();
+	usb3_hub_reset();
 }
diff --git a/src/mainboard/google/skywalker/gpio.h b/src/mainboard/google/skywalker/gpio.h
index 11e2eb36dc..74d9b04154 100644
--- a/src/mainboard/google/skywalker/gpio.h
+++ b/src/mainboard/google/skywalker/gpio.h
@@ -6,5 +6,6 @@
 #include <soc/gpio.h>
 
 #define GPIO_XHCI_INIT_DONE	GPIO(GBE_MDC)
+#define GPIO_USB3_HUB_RST_L	GPIO(GPIO07)
 
 #endif