As required by the USB protocol, add zero packet support for Quectel
EG95 LTE modem module.
Fixes: f815dd5cf48b ("net: usb: qmi_wwan: add support for Quectel EG95
LTE modem"
Signed-off-by: William Sung <william.sung@xxxxxxxxxxxxxxxx>
---
drivers/usb/serial/usb_wwan.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 4b9845807bee..75495c939ac6 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -467,6 +467,7 @@ static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
struct usb_serial *serial = port->serial;
struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
struct urb *urb;
+ struct usb_device_descriptor *desc = &serial->dev->descriptor;
urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
if (!urb)
@@ -476,8 +477,15 @@ static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
usb_sndbulkpipe(serial->dev, endpoint) | dir,
buf, len, callback, ctx);
- if (intfdata->use_zlp && dir == USB_DIR_OUT)
- urb->transfer_flags |= URB_ZERO_PACKET;
+ if (dir == USB_DIR_OUT) {
+ if (intfdata->use_zlp)
+ urb->transfer_flags |= URB_ZERO_PACKET;
+
+ /* Add zero packet support for Quectel EG95 */
+ if (desc->idVendor == cpu_to_le16(0x2C7C) &&
+ desc->idProduct == cpu_to_le16(0x0195))
+ urb->transfer_flags |= URB_ZERO_PACKET;
+ }
return urb;
}
--
2.17.1
