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Wed, 21 Oct 2026 23:12:24 -0700 (PDT) Received: from tuxedo-os.fritz.box ([2a02:8071:b680:2840:9131:192a:9b8d:6849]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48e25827087sm10064063f8f.21.2026.10.21.23.12.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2026 23:12:24 -0700 (PDT) From: Danny Zimmer To: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] USB: quirks: add DEVICE_QUALIFIER quirk for Mobapad C2 Lite gamepad Date: Thu, 22 Oct 2026 08:12:14 +0200 Message-ID: <20261022061214.3497578-1-dzimmer50@googlemail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The Mobapad C2 Lite gamepad in its "Xbox 360 Controller for Windows" mode (USB ID 2345:e06e) fails to enumerate on Linux and enters an endless connect/reset loop. A USB trace shows the device returns its device descriptor, but then stalls the Device_Qualifier request and stops answering any further control transfers, so the host resets it and the cycle repeats indefinitely. The device works on Windows, which does not issue a Device_Qualifier request. Setting USB_QUIRK_DEVICE_QUALIFIER so the host skips that request lets the device enumerate normally; the configuration descriptor is then read at its usual size without problems and the controller binds as an xpad gamepad. Tested on two hosts (x86_64/xhci and Raspberry Pi 3B/dwc_otg). Signed-off-by: Danny Zimmer --- drivers/usb/core/quirks.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index b5b577f..06d15ae 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -586,6 +586,9 @@ static const struct usb_device_id usb_quirk_list[] = { /* VIA Labs, Inc. USB2.0 Hub */ { USB_DEVICE(0x2109, 0x2817), .driver_info = USB_QUIRK_NO_LPM }, + /* Mobapad C2 Lite gamepad - stalls on Device_Qualifier request */ + { USB_DEVICE(0x2345, 0xe06e), .driver_info = USB_QUIRK_DEVICE_QUALIFIER }, + /* Raydium Touchscreen */ { USB_DEVICE(0x2386, 0x3114), .driver_info = USB_QUIRK_NO_LPM }, -- 2.43.0