linux-kernel - [PATCH] clocksource: vf_pit_timer: fix pit_read_sched

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Message-ID: <1397558929-12123-1-git-send-email-Li.Xiubo@freescale.com>
Date:	Tue, 15 Apr 2014 18:48:49 +0800
From:	Xiubo Li <Li.Xiubo@...escale.com>
To:	<daniel.lezcano@...aro.org>, <tglx@...utronix.de>,
	<shawn.guo@...aro.org>
CC:	<linux-kernel@...r.kernel.org>, Xiubo Li <Li.Xiubo@...escale.com>
Subject: [PATCH] clocksource: vf_pit_timer: fix pit_read_sched_clock

The pit_read_sched_clock mean to getting the current counter value,
and the vf pit timer is a down count timer, this should return
the counter value or the cycles elapsed.

Signed-off-by: Xiubo Li <Li.Xiubo@...escale.com>
---
 drivers/clocksource/vf_pit_timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/vf_pit_timer.c b/drivers/clocksource/vf_pit_timer.c
index 02821b0..a918bc4 100644
--- a/drivers/clocksource/vf_pit_timer.c
+++ b/drivers/clocksource/vf_pit_timer.c
@@ -54,7 +54,7 @@ static inline void pit_irq_acknowledge(void)
 
 static u64 pit_read_sched_clock(void)
 {
-	return __raw_readl(clksrc_base + PITCVAL);
+	return ~__raw_readl(clksrc_base + PITCVAL);
 }
 
 static int __init pit_clocksource_init(unsigned long rate)
-- 
1.8.4


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