From 80e1c2b27ec7e7e5707b925c99f49bf1f69d0ddd Mon Sep 17 00:00:00 2001
From: Aidan MacDonald <amachronic@protonmail.com>
Date: Fri, 9 Jan 2026 23:40:16 +0000
Subject: [PATCH] usb-designware: allow setting USB speed in DCFG register

This allows targets to select full speed operation instead
of the default high-speed mode, which is mainly interesting
for debugging USB communication.

Change-Id: I405ff63c6660ca03ea04282a12b59dac06ca46f5
---
 firmware/drivers/usb-designware.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/firmware/drivers/usb-designware.c b/firmware/drivers/usb-designware.c
index 7078a571ac..5dc01fc0b2 100644
--- a/firmware/drivers/usb-designware.c
+++ b/firmware/drivers/usb-designware.c
@@ -93,6 +93,10 @@
 #define USB_DW_FORCED_MODE 0
 #endif
 
+#ifndef USB_DW_DCFG_SPEED
+#define USB_DW_DCFG_SPEED 0
+#endif
+
 #define GET_DTXFNUM(ep) ((DWC_DIEPCTL(ep)>>22) & 0xf)
 
 #define USB_DW_NUM_DIRS 2
@@ -1465,7 +1469,7 @@ static void usb_dw_init(void)
 #endif
     DWC_GAHBCFG = gahbcfg;
 
-    DWC_DCFG = NZLSOHSK;
+    DWC_DCFG = NZLSOHSK | USB_DW_DCFG_SPEED;
 #ifdef USB_DW_SHARED_FIFO
     /* Set EP mismatch counter to the maximum */
     DWC_DCFG |= EPMISCNT(0x1f);