1 files changed, 15 insertions, 0 deletions
diff --git a/src/soc/mediatek/mt8188/usb.c b/src/soc/mediatek/mt8188/usb.c
index 2312e2d42a..75d4667e7a 100644
--- a/src/soc/mediatek/mt8188/usb.c
+++ b/src/soc/mediatek/mt8188/usb.c
@@ -11,7 +11,22 @@
 #include <soc/pll_common.h>
 #include <soc/usb.h>
 
+#define TRAP_USB20_P1_USBD1_EN 0x10005600
+
+static void mt_set_trapping_pin(void)
+{
+	/*
+	 * MT8188 supports port0/port1 download. The hardware needs a trapping pin to
+	 * select the port to use. When port1 is selected, the phy of port1 will be
+	 * switched to port0. That is, port1 connector will be the physical line of
+	 * port0. Since port0 phy isn't initialized in coreboot, switch back to port1
+	 * phy.
+	 */
+	setbits32p(TRAP_USB20_P1_USBD1_EN, BIT(9));
+}
+
 void mtk_usb_prepare(void)
 {
 	mt_pll_set_usb_clock();
+	mt_set_trapping_pin();
 }