[PATCH v8 4/9] clocksource/drivers/arm_arch_timer: use readq to get 64-bit CNTVCT

From	fu.wei@linaro.org
Newsgroups	linux.kernel
Subject	[PATCH v8 4/9] clocksource/drivers/arm_arch_timer: use readq to get 64-bit CNTVCT
Date	2016-07-19 20:20 +0200
Message-ID	<rWHMC-7oq-23@gated-at.bofh.it> (permalink)
References	<rWHMB-7oq-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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From: Fu Wei <fu.wei@linaro.org>

This patch simplify arch_counter_get_cntvct_mem function by
using readq to get 64-bit CNTVCT value instead of readl_relaxed.

Signed-off-by: Fu Wei <fu.wei@linaro.org>
---
 drivers/clocksource/arm_arch_timer.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index e6fd42d..483d2f9 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -418,15 +418,7 @@ u32 arch_timer_get_rate(void)
 
 static u64 arch_counter_get_cntvct_mem(void)
 {
-	u32 vct_lo, vct_hi, tmp_hi;
-
-	do {
-		vct_hi = readl_relaxed(arch_counter_base + CNTVCT_HI);
-		vct_lo = readl_relaxed(arch_counter_base + CNTVCT_LO);
-		tmp_hi = readl_relaxed(arch_counter_base + CNTVCT_HI);
-	} while (vct_hi != tmp_hi);
-
-	return ((u64) vct_hi << 32) | vct_lo;
+	return readq(arch_counter_base + CNTVCT_LO);
 }
 
 /*
-- 
2.5.5

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[PATCH v8 4/9] clocksource/drivers/arm_arch_timer: use readq to get 64-bit CNTVCT fu.wei@linaro.org - 2016-07-19 20:20 +0200
  Re: [PATCH v8 4/9] clocksource/drivers/arm_arch_timer: use readq to  get 64-bit CNTVCT kbuild test robot <lkp@intel.com> - 2016-07-24 22:30 +0200
  Re: [PATCH v8 4/9] clocksource/drivers/arm_arch_timer: use readq to  get 64-bit CNTVCT Will Deacon <will.deacon@arm.com> - 2016-07-25 11:10 +0200
    Re: [PATCH v8 4/9] clocksource/drivers/arm_arch_timer: use readq to  get 64-bit CNTVCT Fu Wei <fu.wei@linaro.org> - 2016-07-25 18:00 +0200

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