linux-kernel - [RFC 02/18] power/reset: vexpress: Use sched

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Date:	Mon, 23 Dec 2013 16:23:34 +0000
From:	Pawel Moll <pawel.moll@....com>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>, Jon Medhurst <tixy@...aro.org>,
	arm@...nel.org, Olof Johansson <olof@...om.net>,
	Pawel Moll <pawel.moll@....com>,
	Anton Vorontsov <anton@...msg.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: [RFC 02/18] power/reset: vexpress: Use sched_clock as the time source

At this stage of system shutdown procedure the jiffies may
not be updated anymore, so have to base on raw sched_clock
values.

Signed-off-by: Pawel Moll <pawel.moll@....com>
Cc: Anton Vorontsov <anton@...msg.org>
Cc: David Woodhouse <dwmw2@...radead.org>
---
 drivers/power/reset/vexpress-poweroff.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/power/reset/vexpress-poweroff.c b/drivers/power/reset/vexpress-poweroff.c
index 476aa49..d752233 100644
--- a/drivers/power/reset/vexpress-poweroff.c
+++ b/drivers/power/reset/vexpress-poweroff.c
@@ -15,6 +15,7 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/sched.h>
 #include <linux/stat.h>
 #include <linux/vexpress.h>
 
@@ -27,12 +28,12 @@ static void vexpress_reset_do(struct device *dev, const char *what)
 			vexpress_config_func_get_by_dev(dev);
 
 	if (func) {
-		unsigned long timeout;
+		unsigned long long timeout_ns;
 
 		err = vexpress_config_write(func, 0, 0);
 
-		timeout = jiffies + HZ;
-		while (time_before(jiffies, timeout))
+		timeout_ns = sched_clock() + 50000000;
+		while (!err && time_before64(sched_clock(), timeout_ns))
 			cpu_relax();
 	}
 
-- 
1.8.3.2


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