coreboot: only init usb if necessary

Up until now the call to initialize the USB subsystem was hardcoded
for U-Boot running as a coreboot payload. This was used to enable
the use of a USB keyboard in the U-Boot shell. However not all boards
might need this functionality. As initializing the USB subsystem can
take a considerable amount of time (several seconds on some boards),
we now initialize the USB subsystem only if U-Boot is configured to
use USB keyboards.

Signed-off-by: Thomas RIENOESSL <thomas.rienoessl@bachmann.info>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

diff --git a/arch/x86/cpu/coreboot/coreboot.c b/arch/x86/cpu/coreboot/coreboot.c
index aaf0d0719245f3f2fc9d772402528cbbfbd4d849..4c6ed0bfb2815140bd91b7f498b7b8d9f944cb13 100644 (file)
--- a/arch/x86/cpu/coreboot/coreboot.c
+++ b/arch/x86/cpu/coreboot/coreboot.c
@@ -77,7 +77,8 @@ int last_stage_init(void)
                timestamp_add_to_bootstage();
 
        /* start usb so that usb keyboard can be used as input device */
-       usb_init();
+       if (CONFIG_IS_ENABLED(USB_KEYBOARD))
+               usb_init();
 
        board_final_cleanup();