There is a bug in Samsung's UDC driver, which is completely disabling the USB device when a custom UDC command is used. Following patch seems to get the right behavior (e.g. enabling pull-up instead of disabling then Vcc is applied). Also I'm not in mailing list so please CC me. Greetingz, Vilo Signed-off-by: Viliam Mateicka <viliam.mateicka@xxxxxxxxx> --- drivers/usb/gadget/s3c2410_udc.c.orig 2011-05-19 06:06:34.000000000 +0200 +++ drivers/usb/gadget/s3c2410_udc.c 2011-06-16 08:57:19.000000000 +0200 @@ -1566,7 +1566,7 @@ static void s3c2410_udc_command(enum s3c return; if (udc_info->udc_command) { - udc_info->udc_command(S3C2410_UDC_P_DISABLE); + udc_info->udc_command(cmd); } else if (gpio_is_valid(udc_info->pullup_pin)) { int value; -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html