linux-kernel - [PATCHv5 1/2] clocksource: dw_apb_timer_of: Fix read_sched

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Date:	Tue, 10 Dec 2013 10:07:57 -0600
From:	<dinguyen@...era.com>
To:	<dinh.linux@...il.com>, <mingo@...nel.org>,
	<daniel.lezcano@...aro.org>, <tglx@...utronix.de>
CC:	<jamie@...ieiles.com>, <linus.walleij@...aro.org>,
	<linux-kernel@...r.kernel.org>, <heiko@...ech.de>,
	Dinh Nguyen <dinguyen@...era.com>
Subject: [PATCHv5 1/2] clocksource: dw_apb_timer_of: Fix read_sched_clock

From: Dinh Nguyen <dinguyen@...era.com>

The read_sched_clock should return the ~value because the clock is a
countdown implementation. read_sched_clock() should be the same as
 __apbt_read_clocksource().

Signed-off-by: Dinh Nguyen <dinguyen@...era.com>
---
v5: Split up into 2 patches
v4: Simplify the fix by simply returning ~__raw_readl(sched_io_base)
v3: Use APBTMR_N_CURRENT_VALUE define in read_sched_clock()
v2: Maintain backwards compatibility for "dw-apb-timer-sp" and
      "dw-apb-timer-osc".
---
 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 45ba8ae..b29d7cd 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 read_sched_clock(void)
 {
-	return __raw_readl(sched_io_base);
+	return ~__raw_readl(sched_io_base);
 }
 
 static const struct of_device_id sptimer_ids[] __initconst = {
-- 
1.7.9.5


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