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authorJisheng Zhang <jszhang@marvell.com>2015-11-26 20:20:38 +0800
committerDaniel Lezcano <daniel.lezcano@linaro.org>2015-12-16 09:44:23 +0100
commit08e4b44852626f3549c8bd45308431d9c9e0ee6d (patch)
tree199a125a955ce755018af169f9d1096d77d3b76d /drivers/clocksource
parent520ddad4e560423a320bc1861792da19b0b879f9 (diff)
downloadlinux-08e4b44852626f3549c8bd45308431d9c9e0ee6d.tar.bz2
clockevents/drivers/arm_global_timer: Use writel_relaxed in gt_compare_set
Use the relaxed version to improve performance. we measured time of 4096 rounds of gt_compare_set() spent on Marvell BG2Q: before the patch: 3690648ns on average after the patch: 1083023ns on average improved by 70%! Signed-off-by: Jisheng Zhang <jszhang@marvell.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/arm_global_timer.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c
index a2cb6fae9295..f99be6bafad1 100644
--- a/drivers/clocksource/arm_global_timer.c
+++ b/drivers/clocksource/arm_global_timer.c
@@ -99,17 +99,17 @@ static void gt_compare_set(unsigned long delta, int periodic)
counter += delta;
ctrl = GT_CONTROL_TIMER_ENABLE;
- writel(ctrl, gt_base + GT_CONTROL);
- writel(lower_32_bits(counter), gt_base + GT_COMP0);
- writel(upper_32_bits(counter), gt_base + GT_COMP1);
+ writel_relaxed(ctrl, gt_base + GT_CONTROL);
+ writel_relaxed(lower_32_bits(counter), gt_base + GT_COMP0);
+ writel_relaxed(upper_32_bits(counter), gt_base + GT_COMP1);
if (periodic) {
- writel(delta, gt_base + GT_AUTO_INC);
+ writel_relaxed(delta, gt_base + GT_AUTO_INC);
ctrl |= GT_CONTROL_AUTO_INC;
}
ctrl |= GT_CONTROL_COMP_ENABLE | GT_CONTROL_IRQ_ENABLE;
- writel(ctrl, gt_base + GT_CONTROL);
+ writel_relaxed(ctrl, gt_base + GT_CONTROL);
}
static int gt_clockevent_shutdown(struct clock_event_device *evt)