linux-kernel - [PATCH 10/11] clocksource: dw_apb_timer

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Message-Id: <1427746633-9137-10-git-send-email-daniel.lezcano@linaro.org>
Date:	Mon, 30 Mar 2015 22:17:12 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	tglx@...utronix.de, mingo@...nel.org
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	maxime.ripard@...e-electrons.com, viresh.kumar@...aro.org,
	ben.dooks@...ethink.co.uk, digetx@...il.com, hdegoede@...hat.com,
	laurent.pinchart+renesas@...asonboard.com
Subject: [PATCH 10/11] clocksource: dw_apb_timer_of: Make IO endian agnostic

From: Ben Dooks <ben.dooks@...ethink.co.uk>

The dw_apb_timer_of timer is using __raw_readl to access the timer
register, which is causing issues when the system is running in
big endian mode. Fix this by using readl_relaxed() which should
account for the endian settings.

This fixes issues where the time jumps around in the dmesg output
due to returnling __le32 values.

For an example, these two console lines show time running backwards:

[   49.882572] CPU1: failed to come online
[   43.282457] Brought up 1 CPUs

Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>
Cc: Dinh Nguyen <dinguyen@...nsource.altera.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
---
 drivers/clocksource/dw_apb_timer_of.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/dw_apb_timer_of.c b/drivers/clocksource/dw_apb_timer_of.c
index d305fb0..a19a3f6 100644
--- a/drivers/clocksource/dw_apb_timer_of.c
+++ b/drivers/clocksource/dw_apb_timer_of.c
@@ -108,7 +108,7 @@ static void __init add_clocksource(struct device_node *source_timer)
 
 static u64 notrace read_sched_clock(void)
 {
-	return ~__raw_readl(sched_io_base);
+	return ~readl_relaxed(sched_io_base);
 }
 
 static const struct of_device_id sptimer_ids[] __initconst = {
-- 
1.9.1

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