Commit-ID: 08e4b44852626f3549c8bd45308431d9c9e0ee6d
Gitweb: http://git.kernel.org/tip/08e4b44852626f3549c8bd45308431d9c9e0ee6d
Author: Jisheng Zhang <jszhang@xxxxxxxxxxx>
AuthorDate: Thu, 26 Nov 2015 20:20:38 +0800
Committer: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
CommitDate: Wed, 16 Dec 2015 09:44:23 +0100
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@xxxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
---
drivers/clocksource/arm_global_timer.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c
index a2cb6fa..f99be6b 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)
--
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