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Sun, 06 Sep 2026 11:05:12 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Herman Semenoff Date: Sun, 6 Sep 2026 21:05:05 +0300 X-Gm-Features: AcwNN1UFEVFNvQf-_X8sOKVlhKXXkSgs5UqaHugB48_TROvAqilevHmYdWT9u90 Message-ID: Subject: [PATCH] wifi: mt7601u: add vnd_reset parameter to fix probe failure on Tenda U2 To: kuba@kernel.org, kvalo@kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On certain MT7601U adapters, such as Tenda U2 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 Build time: 201302052146____ 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. Introduce a boolean module parameter 'vnd_reset' (default: false) to make this vendor reset optional. When the vendor reset is skipped, firmware upload succeeds and the wireless interface initializes normally. Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1716301 Link: https://www.opena.tv/viewtopic.php?t=3D63919 Link: https://askubuntu.com/questions/1418850/the-problem-with-wi-fi-u2 Link: https://bbs.archlinux.org/viewtopic.php?id=3D224859 Link: https://reddit.com/r/archlinux/comments/1d6dfv5/mt7601u_usb_wifi_not_= working/ Signed-off-by: Herman Semenoff --- drivers/net/wireless/mediatek/mt7601u/mcu.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt7601u/mcu.c b/drivers/net/wireless/mediatek/mt7601u/mcu.c index bad6ca821..abf4767f1 100644 --- a/drivers/net/wireless/mediatek/mt7601u/mcu.c +++ b/drivers/net/wireless/mediatek/mt7601u/mcu.c @@ -10,6 +10,7 @@ #include #include #include +#include #include "mt7601u.h" #include "dma.h" @@ -21,6 +22,14 @@ #define MCU_FW_URB_SIZE (MCU_FW_URB_MAX_PAYLOAD + 12) #define MCU_RESP_URB_SIZE 1024 +static bool vnd_reset; +module_param(vnd_reset, bool, 0644); +MODULE_PARM_DESC(vnd_reset, "Perform vendor reset during firmware upload (default: false)"); + +static bool disable_usb_sg; +module_param(disable_usb_sg, bool, 0644); +MODULE_PARM_DESC(disable_usb_sg, "Unused compatibility parameter"); + static inline int firmware_running(struct mt7601u_dev *dev) { return mt7601u_rr(dev, MT_MCU_COM_REG0) =3D=3D 1; @@ -459,8 +468,10 @@ static int mt7601u_load_firmware(struct mt7601u_dev *d= ev) mt7601u_wr(dev, 0x94c, 0); mt7601u_wr(dev, MT_FCE_PSE_CTRL, 0); - mt7601u_vendor_reset(dev); - msleep(5); + if (vnd_reset) { + mt7601u_vendor_reset(dev); + msleep(5); + } mt7601u_wr(dev, 0xa44, 0); mt7601u_wr(dev, 0x230, 0x84210); --=20 2.55.0