--- a/arch/arm/mach-rockchip/boot_mode.c
+++ b/arch/arm/mach-rockchip/boot_mode.c
@@ -73,7 +73,7 @@ __weak int rockchip_dnl_key_pressed(void
 	ret = -ENODEV;
 	uclass_foreach_dev(dev, uc) {
 		if (!strncmp(dev->name, "saradc", 6)) {
-			ret = adc_channel_single_shot(dev->name, 1, &val);
+			ret = adc_channel_single_shot(dev->name, 0, &val);
 			break;
 		}
 	}
