From: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> The RTS/CTS line discipline for this device doesn't follow the standard. So, in order to properly support TX, a separate driver is needed. Ensure that cdc_acm will ignore it during probe time, if the Kernel is built with support for it. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> Signed-off-by: Manivannan Sadhasivam <mani@xxxxxxxxxx> --- drivers/usb/class/cdc-acm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 30ef946a8e1a..719829e6b6db 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1890,6 +1890,12 @@ static const struct usb_device_id acm_ids[] = { }, #endif +#if IS_ENABLED(CONFIG_USB_SERIAL_XR) + { USB_DEVICE(0x04e2, 0x1410), /* Ignore XR21V141X USB to Serial converter */ + .driver_info = IGNORE_DEVICE, + }, +#endif + /*Samsung phone in firmware update mode */ { USB_DEVICE(0x04e8, 0x685d), .driver_info = IGNORE_DEVICE, -- 2.25.1