linux-kernel - [PATCH] msm: timer: Decrease shift on timer clocksource

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Message-Id: <1287653148-1103-1-git-send-email-johlstei@codeaurora.org>
Date:	Thu, 21 Oct 2010 02:25:45 -0700
From:	Jeff Ohlstein <johlstei@...eaurora.org>
To:	Daniel Walker <dwalker@...eaurora.org>
Cc:	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jeff Ohlstein <johlstei@...eaurora.org>,
	David Brown <davidb@...eaurora.org>,
	Daniel Walker <dwalker@...eaurora.org>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	Russell King <linux@....linux.org.uk>
Subject: [PATCH] msm: timer: Decrease shift on timer clocksource

The shift of 24 causes the shift and multiply operation to sometimes
overflow, resulting in incorrect timer values and poor performance.

Signed-off-by: Jeff Ohlstein <johlstei@...eaurora.org>
---
 arch/arm/mach-msm/timer.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index 7689848..950100f 100644
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c
@@ -137,7 +137,7 @@ static struct msm_clock msm_clocks[] = {
 			.rating         = 200,
 			.read           = msm_gpt_read,
 			.mask           = CLOCKSOURCE_MASK(32),
-			.shift          = 24,
+			.shift          = 17,
 			.flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 		},
 		.irq = {
-- 
1.7.3.1

Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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