V4L/DVB (11927): em28xx: provide module option to disable USB speed check
Add an em28xx 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>
diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c
index b2c2629..36abb35 100644
--- a/drivers/media/video/em28xx/em28xx-cards.c
+++ b/drivers/media/video/em28xx/em28xx-cards.c
@@ -49,6 +49,11 @@
module_param(disable_ir, int, 0444);
MODULE_PARM_DESC(disable_ir, "disable infrared remote support");
+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");
+
static unsigned int card[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
module_param_array(card, int, NULL, 0444);
MODULE_PARM_DESC(card, "card type");
@@ -2371,7 +2376,7 @@
* video stream wouldn't likely work, since 12 Mbps is generally
* not enough even for most Digital TV streams.
*/
- if (udev->speed != USB_SPEED_HIGH) {
+ if (udev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
printk(DRIVER_NAME ": Device initialization failed.\n");
printk(DRIVER_NAME ": Device must be connected to a high-speed"
" USB 2.0 port.\n");