linux-kernel - [PATCH 2/7] arm: zynq: timer: Remove unnecessary register write

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Message-ID: <26c7059f-09d2-4b0a-83a8-e27d10fbd100@DB3EHSMHS008.ehs.local>
Date:	Tue, 18 Dec 2012 16:16:34 -0800
From:	Soren Brinkmann <soren.brinkmann@...inx.com>
To:	<linux-kernel@...r.kernel.org>,
	Michal Simek <michal.simek@...inx.com>, <monstr@...str.eu>,
	John Linn <john.linn@...inx.com>
CC:	<git@...inx.com>, <josh.cartwright@...com>,
	Soren Brinkmann <soren.brinkmann@...inx.com>
Subject: [PATCH 2/7] arm: zynq: timer: Remove unnecessary register write

Acknowedging an interrupt requires to read the interrupt register
only. The write was only required to work around a bug in
the QEMU implementation of the TTC, which is fixed.

Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
Acked-by: Peter Crosthwaite <peter.crosthwaite@...inx.com>
---
@Peter: I took over your ACK, since it's the same change we applied to the
Xilinx tree a couple of weeks ago. Let me know if this should be removed.

 arch/arm/mach-zynq/timer.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm/mach-zynq/timer.c b/arch/arm/mach-zynq/timer.c
index 570491d..f1d224b 100644
--- a/arch/arm/mach-zynq/timer.c
+++ b/arch/arm/mach-zynq/timer.c
@@ -121,8 +121,7 @@ static irqreturn_t xttcps_clock_event_interrupt(int irq, void *dev_id)
 	struct xttcps_timer *timer = &xttce->xttc;
 
 	/* Acknowledge the interrupt and call event handler */
-	__raw_writel(__raw_readl(timer->base_addr + XTTCPS_ISR_OFFSET),
-			timer->base_addr + XTTCPS_ISR_OFFSET);
+	__raw_readl(timer->base_addr + XTTCPS_ISR_OFFSET);
 
 	xttce->ce.event_handler(&xttce->ce);
 
-- 
1.8.0.2


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