From 12e55ba8a68e5d40e08ad169848bdf274887ce0b Mon Sep 17 00:00:00 2001
From: "Ronald G. Minnich" <rminnich@gmail.com>
Date: Sun, 18 Aug 2013 20:01:07 -0700
Subject: [PATCH] Exynos5420: invoke the cooperative threading in udelay

Call thread_yield_microseconds in udelay. This works with and without
COOP_MULTITASKING enabled.

BUG=None
TEST=Build and boot with multitasking on and off, it works.
BRANCH=None

Change-Id: Ib3eab00d1630dc4daada850e7458ab89702d1864
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/66327
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Ronald G. Minnich <rminnich@chromium.org>
Tested-by: Ronald G. Minnich <rminnich@chromium.org>
---
 src/cpu/samsung/exynos5420/timer.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/cpu/samsung/exynos5420/timer.c b/src/cpu/samsung/exynos5420/timer.c
index 0c2e64143c..724f43a3fd 100644
--- a/src/cpu/samsung/exynos5420/timer.c
+++ b/src/cpu/samsung/exynos5420/timer.c
@@ -20,7 +20,7 @@
 #include <console/console.h>
 #include <timer.h>
 #include <delay.h>
-
+#include <thread.h>
 #include "clk.h"
 
 void init_timer(void)
@@ -33,6 +33,9 @@ void udelay(unsigned usec)
 {
 	struct mono_time current, end;
 
+	if (!thread_yield_microseconds(usec))
+		return;
+
 	timer_monotonic_get(&current);
 	end = current;
 	mono_time_add_usecs(&end, usec);