mb/facebook/watson: Make turbo mode configurable (disabled by default)

Change-Id: Ief1eaab960c8fdab5bd5041b1a4f0c6ba1dd833f
Signed-off-by: David Hendricks <dhendrix@fb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32222
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/facebook/watson/Kconfig

@@ -41,4 +41,8 @@ config FMDFILE
 	string
 	default "src/mainboard/$(CONFIG_MAINBOARD_DIR)/board.fmd"
 
+config ENABLE_TURBO
+	bool "Enable turbo frequency"
+	default n
+
 endif # BOARD_FACEBOOK_WATSON

src/mainboard/facebook/watson/mainboard.c

@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2007-2009 coresystems GmbH
  * Copyright (C) 2011 Google Inc.
+ * Copyright (C) Facebook, Inc. and its affiliates
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -14,6 +15,7 @@
  * GNU General Public License for more details.
  */
 
+#include <cpu/intel/turbo.h>
 #include <device/device.h>
 
 /*
@@ -25,6 +27,14 @@ static void mainboard_enable(struct device *dev)
 
 }
 
+static void mainboard_init(void *chip_info)
+{
+#if !IS_ENABLED(CONFIG_ENABLE_TURBO)
+	disable_turbo();
+#endif
+}
+
 struct chip_operations mainboard_ops = {
 	.enable_dev = mainboard_enable,
+	.init = mainboard_init,
 };