[PATCH v8 4/9] clocksource/drivers/arm_arch_timer: use readq to get 64-bit CNTVCT
From: fu.wei at linaro.org <hidden>
Date: 2016-07-19 18:19:45
Also in:
linux-acpi, linux-watchdog, lkml
Subsystem:
arm architected timer driver, clocksource, clockevent drivers, the rest · Maintainers:
Mark Rutland, Marc Zyngier, Daniel Lezcano, Thomas Gleixner, Linus Torvalds
From: Fu Wei <redacted> 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 <redacted> --- 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