usb: core: make default autosuspend delay configurable

Make the default autosuspend delay configurable at build time.
This is useful for systems that require a non-standard value as
it avoids relying on the command line being properly set.

Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/Kconfig

@@ -91,3 +91,15 @@ config USB_LEDS_TRIGGER_USBPORT
 	  This driver allows LEDs to be controlled by USB events. Enabling this
 	  trigger allows specifying list of USB ports that should turn on LED
 	  when some USB device gets connected.
+
+config USB_AUTOSUSPEND_DELAY
+	int "Default autosuspend delay"
+	depends on USB
+	default 2
+	help
+	  The default autosuspend delay in seconds.  Can be overridden
+	  with the usbcore.autosuspend command line or module parameter.
+
+	  The default value Linux has always had is 2 seconds.  Change
+	  this value if you want a different delay and cannot modify
+	  the command line or module parameter.

drivers/usb/core/usb.c

@@ -64,8 +64,8 @@ int usb_disabled(void)
 EXPORT_SYMBOL_GPL(usb_disabled);
 
 #ifdef	CONFIG_PM
-static int usb_autosuspend_delay = 2;		/* Default delay value,
-						 * in seconds */
+/* Default delay value, in seconds */
+static int usb_autosuspend_delay = CONFIG_USB_AUTOSUSPEND_DELAY;
 module_param_named(autosuspend, usb_autosuspend_delay, int, 0644);
 MODULE_PARM_DESC(autosuspend, "default autosuspend delay");