From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6C3DE3D47CE; Tue, 16 Jun 2026 18:13:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781633599; cv=none; b=b8YcQEN5XsKGRs5iX+K+7Nq6z7jsi8t6YbcEZBGd1dmpMVFJRAI4rQ7mcCaxSE160gZbhcaCsECbPKI0y4T80px24zOkSv3PPXih0iN3dv5UIOmAgNbJwTAFF06r2POhlumuUHBVdgURk+YqzaE2t5gjlOtXuTfHEZeCgSCi9cc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781633599; c=relaxed/simple; bh=38jk3uO1FJK3Igc7wHQ8UE+6juMCJACIufX3xW7GrSc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BI7PW5yVD4aTA5VsuwwCV5tIj8ZwoqW1FX24jYEUVJlhoKb7V7Ov05XFvFdJRLAtS9wxbfvgkNZ++7/9nRUuOf0E7RgJ3UKds1vZ8WAXMLJUATpG70V6iPeCWVb31N2Kvd0tKQzqoLla6HS/nKadwOLu/apYVAdmqiaFBqj/+2A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dddWSme4; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="dddWSme4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5DD3A1F00A3A; Tue, 16 Jun 2026 18:13:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781633598; bh=TCWg5OWGvs1jAMv9g4U8idC3jh4gqgu5hSYwM8d7gCk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=dddWSme4qmDq6T0hPB8AaVjHBGDXbI8CBEiPnheXzJ0vhZAfWrvJajeLPaRy+hdcW BbTkrLLctsEFW9CBhoxrSbzpN4BRmBKsM66ziMnBcRTjf2uJHdUBJKx8Cz8CnqAh9z iprDy21eG9Hv3hCS81SdcWJPII+pPMS2t+2BBQbQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Stephen J. Fuhry" , stable Subject: [PATCH 5.15 109/411] USB: quirks: add NO_LPM for Lenovo ThinkPad USB-C Dock Gen2 hub controllers Date: Tue, 16 Jun 2026 20:25:47 +0530 Message-ID: <20260616145106.066169430@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145100.376842714@linuxfoundation.org> References: <20260616145100.376842714@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stephen J. Fuhry commit 9ddb9c0deca48d2c2a22ebf4d2f35c925a520328 upstream. The Lenovo ThinkPad USB-C Dock Gen2 (17ef:a391, 17ef:a392) hub controllers exhibit link instability when USB Link Power Management is enabled, similar to the dock's Ethernet adapter (17ef:a387) which already carries USB_QUIRK_NO_LPM. When the dock reconnects after a transient disconnect, the hub controllers enter LPM states between re-enumeration retries, causing repeated disconnect/reconnect cycles lasting up to two minutes. Disabling LPM for these devices restores stable enumeration. Signed-off-by: Stephen J. Fuhry Cc: stable Link: https://patch.msgid.link/20260513171419.44849-1-fuhrysteve@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/quirks.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -497,6 +497,10 @@ static const struct usb_device_id usb_qu /* Lenovo ThinkPad USB-C Dock Gen2 Ethernet (RTL8153 GigE) */ { USB_DEVICE(0x17ef, 0xa387), .driver_info = USB_QUIRK_NO_LPM }, + /* Lenovo ThinkPad USB-C Dock Gen2 USB 3.1 and USB 2.0 hub controllers */ + { USB_DEVICE(0x17ef, 0xa391), .driver_info = USB_QUIRK_NO_LPM }, + { USB_DEVICE(0x17ef, 0xa392), .driver_info = USB_QUIRK_NO_LPM }, + /* BUILDWIN Photo Frame */ { USB_DEVICE(0x1908, 0x1315), .driver_info = USB_QUIRK_HONOR_BNUMINTERFACES },