USB debug port only supports 8 byte rx/tx packets. Although spec implies that
"if a packet larger than eight bytes is received from the remote computer, the
device must break the larger packet into eight-byte packets before sending the
data to the Debug Port", the real PLX NET20DC device does not handle it right -
data is corrupted on debug port end if serial interface sends >8 byte urbs.
Patch below fixes the issue by limiting tx urb to 8 byte.
Signed off by: Aleks Gorelov <dared1st@yahoo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
#include <linux/usb.h>
#include <linux/usb/serial.h>
+#define USB_DEBUG_MAX_PACKET_SIZE 8
+
static struct usb_device_id id_table [] = {
{ USB_DEVICE(0x0525, 0x127a) },
{ },
.no_dynamic_id = 1,
};
+int usb_debug_open(struct usb_serial_port *port, struct file *filp)
+{
+ port->bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE;
+ return usb_serial_generic_open(port, filp);
+}
+
static struct usb_serial_driver debug_device = {
.driver = {
.owner = THIS_MODULE,
},
.id_table = id_table,
.num_ports = 1,
+ .open = usb_debug_open,
};
static int __init debug_init(void)