[RESEND FIX PATCH wireless-next] wifi: mt7601u: add vnd_reset parameter to fix probe failure on Tenda U2
From: Herman Semenoff
Date: Tue Sep 15 2026 - 21:36:29 EST
On certain MT7601U adapters, such as Tenda U2 (USB ID 148f:7601) and
other newer hardware revisions, driver initialization consistently fails
during probe with vendor request timeouts (-110 / -ETIMEDOUT):
mt7601u 3-14:1.0: ASIC revision: 76010001 MAC revision: 76010500
mt7601u 3-14:1.0: Firmware Version: 0.1.00 Build: 7640
mt7601u 3-14:1.0: Vendor request req:07 off:09a8 failed:-110
mt7601u 3-14:1.0: Vendor request req:02 off:09a8 failed:-110
mt7601u 3-14:1.0: Vendor request req:07 off:0734 failed:-110
mt7601u 3-14:1.0: Vendor request req:42 off:0230 failed:-110
mt7601u 3-14:1.0: probe with driver mt7601u failed with error -110
The failure occurs because mt7601u_load_firmware() unconditionally calls
mt7601u_vendor_reset() (MT_VEND_DEV_MODE_RESET) before uploading firmware
chunks. On these devices, issuing this vendor reset leaves the internal
MCU / FCE DMA engine in an unresponsive state after the first firmware
URB is submitted. As a result, reading MT_TX_CPU_FROM_FCE_CPU_DESC_IDX
(0x09a8) immediately times out.
The USB device is already reset during mt7601u_probe() via
usb_reset_device(), making this additional vendor-specific reset
redundant. The vendor driver never used it, and devices that work with
vendor reset also work properly without it.
Drop mt7601u_vendor_reset() and its definition to allow firmware upload
and probe to succeed on all MT7601U adapters.
Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1716301
Link: https://www.opena.tv/viewtopic.php?t=63919
Link: https://askubuntu.com/questions/1418850/the-problem-with-wi-fi-u2
Link: https://bbs.archlinux.org/viewtopic.php?id=224859
Link: https://reddit.com/r/archlinux/comments/1d6dfv5/mt7601u_usb_wifi_not_working/
Signed-off-by: Herman Semenoff <GermanAizek@xxxxxxxxxxxxx>
---
drivers/net/wireless/mediatek/mt7601u/mcu.c | 3 ---
drivers/net/wireless/mediatek/mt7601u/usb.c | 6 ------
drivers/net/wireless/mediatek/mt7601u/usb.h | 3 ---
3 files changed, 12 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt7601u/mcu.c
b/drivers/net/wireless/mediatek/mt7601u/mcu.c
index bad6ca821400..979bc506d4ed 100644
--- a/drivers/net/wireless/mediatek/mt7601u/mcu.c
+++ b/drivers/net/wireless/mediatek/mt7601u/mcu.c
@@ -459,9 +459,6 @@ static int mt7601u_load_firmware(struct mt7601u_dev *dev)
mt7601u_wr(dev, 0x94c, 0);
mt7601u_wr(dev, MT_FCE_PSE_CTRL, 0);
- mt7601u_vendor_reset(dev);
- msleep(5);
-
mt7601u_wr(dev, 0xa44, 0);
mt7601u_wr(dev, 0x230, 0x84210);
mt7601u_wr(dev, 0x400, 0x80c00);
diff --git a/drivers/net/wireless/mediatek/mt7601u/usb.c
b/drivers/net/wireless/mediatek/mt7601u/usb.c
index 9306870cbc91..0d38644c491e 100644
--- a/drivers/net/wireless/mediatek/mt7601u/usb.c
+++ b/drivers/net/wireless/mediatek/mt7601u/usb.c
@@ -116,12 +116,6 @@ int mt7601u_vendor_request(struct mt7601u_dev
*dev, const u8 req,
return ret;
}
-void mt7601u_vendor_reset(struct mt7601u_dev *dev)
-{
- mt7601u_vendor_request(dev, MT_VEND_DEV_MODE, USB_DIR_OUT,
- MT_VEND_DEV_MODE_RESET, 0, NULL, 0);
-}
-
/* should be called with vendor_req_mutex held */
static u32 __mt7601u_rr(struct mt7601u_dev *dev, u32 offset)
{
diff --git a/drivers/net/wireless/mediatek/mt7601u/usb.h
b/drivers/net/wireless/mediatek/mt7601u/usb.h
index 723025f84483..49fede310c3b 100644
--- a/drivers/net/wireless/mediatek/mt7601u/usb.h
+++ b/drivers/net/wireless/mediatek/mt7601u/usb.h
@@ -14,8 +14,6 @@
#define MT_VEND_REQ_MAX_RETRY 10
#define MT_VEND_REQ_TOUT_MS 300
-#define MT_VEND_DEV_MODE_RESET 1
-
#define MT_VEND_BUF sizeof(__le32)
enum mt_vendor_req {
@@ -65,7 +63,6 @@ void mt7601u_complete_urb(struct urb *urb);
int mt7601u_vendor_request(struct mt7601u_dev *dev, const u8 req,
const u8 direction, const u16 val, const u16 offset,
void *buf, const size_t buflen);
-void mt7601u_vendor_reset(struct mt7601u_dev *dev);
int mt7601u_vendor_single_wr(struct mt7601u_dev *dev, const u8 req,
const u16 offset, const u32 val);
--
2.55.0
base-commit: af5f12805e5cefa4fe68d6127c7e1fb78cd5535c