From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 DD402336EE1; Mon, 20 Apr 2026 15:53:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776700422; cv=none; b=MinxUxalLgE5ktzF2Qk+EBENKLvgvOu1FHCKlCLNBqsK5jiSE+Uysl7ysMVwwuRdyc+Nkdb8M1wt+mnod1d2Tv54UHuhlECfRfuClJHucHOaDJSXUilKqH1YOwqjcaqt8aNPAiWfvSSvkoLJJlyuUMcwSosWwEajLt6Xjo/34/8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776700422; c=relaxed/simple; bh=0CK131Mx2oRZK9OWkUpABiODW1pcXZHnKDjnM1S/OAM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=EsxOvSSa9aj1ytxiErUZfuhsb4jC25p8bMUq/6OIgylLFEzUFVxSnn+Ss3fATqcjKt9h33M85/4XFus3BZlWJK7h7B6dN6S8ZXrBd2wzz8MUqF8XUO+ohwg5QRbgQjut2j/BE4hvWJotl63a+6DlsEIuGcfyMXJzFWAwTjkfOYw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=JiSVcLl8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="JiSVcLl8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 72C2FC19425; Mon, 20 Apr 2026 15:53:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776700422; bh=0CK131Mx2oRZK9OWkUpABiODW1pcXZHnKDjnM1S/OAM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JiSVcLl8hggeXRdZoArwVtvbeKtORG+OZjRk/1SY1aY4HAbZOUhgiqVtxDNQAkiHr gjj4iYVu1mS1S2f5TTUCDlvRLPfyS+l1sdlQnzfXHE8RXNvEPoauNh99md9KCsiQ4a hVgzyrj+JA4bDysf62llk6BaZrALeNeBaMBLWKyA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dave Carey , stable , Oliver Neukum Subject: [PATCH 6.19 166/220] USB: cdc-acm: Add quirks for Yoga Book 9 14IAH10 INGENIC touchscreen Date: Mon, 20 Apr 2026 17:41:47 +0200 Message-ID: <20260420153940.004280507@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260420153934.013228280@linuxfoundation.org> References: <20260420153934.013228280@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Carey commit f58752ebcb35e156c85cd1a82d6579c7af3b9023 upstream. The Lenovo Yoga Book 9 14IAH10 (83KJ) has a composite USB device (17EF:6161) that controls both touchscreens via a CDC ACM interface. Interface 0 is a standard CDC ACM control interface, but interface 1 (the data interface) incorrectly declares vendor-specific class (0xFF) instead of USB_CLASS_CDC_DATA. cdc-acm rejects the device at probe with -EINVAL, leaving interface 0 unbound and EP 0x82 never polled. With no consumer polling EP 0x82, the firmware's watchdog fires every ~20 seconds and resets the USB bus, producing a continuous disconnect/ reconnect loop that prevents the touchscreens from ever initialising. Add two new quirk flags: VENDOR_CLASS_DATA_IFACE: Bypasses the bInterfaceClass check in acm_probe() that would otherwise reject the vendor-class data interface with -EINVAL. ALWAYS_POLL_CTRL: Submits the notification URB at probe() rather than waiting for a TTY open. This keeps EP 0x82 polled at all times, permanently suppressing the firmware watchdog. The URB is resubmitted after port_shutdown() and on system resume. SET_CONTROL_LINE_STATE (DTR|RTS) is sent at probe and after port_shutdown() to complete firmware handshake. Note: the firmware performs exactly 4 USB connect/disconnect cycles (~19 s each) on every cold boot before stabilising. This is a fixed firmware property; touch is available ~75-80 s after power-on. Signed-off-by: Dave Carey Cc: stable Tested-by: Dave Carey Acked-by: Oliver Neukum Link: https://patch.msgid.link/20260402182950.389016-1-carvsdriver@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-acm.c | 53 ++++++++++++++++++++++++++++++++++++++------ 1 file changed, 46 insertions(+), 7 deletions(-) --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -114,6 +114,8 @@ static int acm_ctrl_msg(struct acm *acm, int retval; retval = usb_autopm_get_interface(acm->control); +#define VENDOR_CLASS_DATA_IFACE BIT(9) /* data interface uses vendor-specific class */ +#define ALWAYS_POLL_CTRL BIT(10) /* keep ctrl URB active even without an open TTY */ if (retval) return retval; @@ -710,12 +712,14 @@ static int acm_port_activate(struct tty_ set_bit(TTY_NO_WRITE_SPLIT, &tty->flags); acm->control->needs_remote_wakeup = 1; - acm->ctrlurb->dev = acm->dev; - retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL); - if (retval) { - dev_err(&acm->control->dev, - "%s - usb_submit_urb(ctrl irq) failed\n", __func__); - goto error_submit_urb; + if (!(acm->quirks & ALWAYS_POLL_CTRL)) { + acm->ctrlurb->dev = acm->dev; + retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL); + if (retval) { + dev_err(&acm->control->dev, + "%s - usb_submit_urb(ctrl irq) failed\n", __func__); + goto error_submit_urb; + } } acm_tty_set_termios(tty, NULL); @@ -788,6 +792,14 @@ static void acm_port_shutdown(struct tty acm_unpoison_urbs(acm); + if (acm->quirks & ALWAYS_POLL_CTRL) { + acm->ctrlurb->dev = acm->dev; + if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) + dev_dbg(&acm->control->dev, + "ctrl polling restart failed after port close\n"); + /* port_shutdown() cleared DTR/RTS; restore them */ + acm_set_control(acm, USB_CDC_CTRL_DTR | USB_CDC_CTRL_RTS); + } } static void acm_tty_cleanup(struct tty_struct *tty) @@ -1328,6 +1340,9 @@ skip_normal_probe: dev_dbg(&intf->dev, "Your device has switched interfaces.\n"); swap(control_interface, data_interface); + } else if (quirks & VENDOR_CLASS_DATA_IFACE) { + dev_dbg(&intf->dev, + "Vendor-specific data interface class, continuing.\n"); } else { return -EINVAL; } @@ -1522,6 +1537,9 @@ skip_countries: acm->line.bDataBits = 8; acm_set_line(acm, &acm->line); + if (quirks & ALWAYS_POLL_CTRL) + acm_set_control(acm, USB_CDC_CTRL_DTR | USB_CDC_CTRL_RTS); + if (!acm->combined_interfaces) { rv = usb_driver_claim_interface(&acm_driver, data_interface, acm); if (rv) @@ -1543,6 +1561,13 @@ skip_countries: dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor); + if (acm->quirks & ALWAYS_POLL_CTRL) { + acm->ctrlurb->dev = acm->dev; + if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) + dev_warn(&intf->dev, + "failed to start persistent ctrl polling\n"); + } + return 0; err_release_data_interface: @@ -1669,7 +1694,7 @@ static int acm_resume(struct usb_interfa acm_unpoison_urbs(acm); - if (tty_port_initialized(&acm->port)) { + if (tty_port_initialized(&acm->port) || (acm->quirks & ALWAYS_POLL_CTRL)) { rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC); for (;;) { @@ -2016,6 +2041,20 @@ static const struct usb_device_id acm_id /* CH343 supports CAP_BRK, but doesn't advertise it */ { USB_DEVICE(0x1a86, 0x55d3), .driver_info = MISSING_CAP_BRK, }, + /* + * Lenovo Yoga Book 9 14IAH10 (83KJ) — INGENIC 17EF:6161 touchscreen + * composite device. The CDC ACM control interface (0) uses a standard + * Union descriptor, but the data interface (1) is declared as vendor- + * specific class (0xff) with no CDC data descriptors, so cdc-acm would + * normally reject it. The firmware also requires continuous polling of + * the notification endpoint (EP 0x82) to suppress a 20-second watchdog + * reset; ALWAYS_POLL_CTRL keeps the ctrlurb active even when no TTY is + * open. Match only the control interface by class to avoid probing the + * vendor-specific data interface. + */ + { USB_DEVICE_INTERFACE_CLASS(0x17ef, 0x6161, USB_CLASS_COMM), + .driver_info = VENDOR_CLASS_DATA_IFACE | ALWAYS_POLL_CTRL }, + /* control interfaces without any protocol set */ { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, USB_CDC_PROTO_NONE) },