V4L/DVB (11928): au0828: provide module option to disable USB speed check

Add an au0828 module option that allows a user to override the USB speed check.
Intended for advanced users who understand the consequences of trying to use
the device with a 12Mbps bus.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/au0828/au0828-core.c

@@ -36,6 +36,11 @@ int au0828_debug;
 module_param_named(debug, au0828_debug, int, 0644);
 MODULE_PARM_DESC(debug, "enable debug messages");
 
+static unsigned int disable_usb_speed_check;
+module_param(disable_usb_speed_check, int, 0444);
+MODULE_PARM_DESC(disable_usb_speed_check,
+		 "override min bandwidth requirement of 480M bps");
+
 #define _AU0828_BULKPIPE 0x03
 #define _BULKPIPESIZE 0xffff
 
@@ -186,7 +191,7 @@ static int au0828_usb_probe(struct usb_interface *interface,
 	 * video stream wouldn't likely work, since 12 Mbps is generally
 	 * not enough even for most Digital TV streams.
 	 */
-	if (usbdev->speed != USB_SPEED_HIGH) {
+	if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
 		printk(KERN_ERR "au0828: Device initialization failed.\n");
 		printk(KERN_ERR "au0828: Device must be connected to a "
 		       "high-speed USB 2.0 port.\n");