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| author | Jisheng Zhang <jszhang@marvell.com> | 2015-11-26 20:20:38 +0800 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2015-12-16 09:44:23 +0100 |
| commit | 08e4b44852626f3549c8bd45308431d9c9e0ee6d (patch) | |
| tree | 199a125a955ce755018af169f9d1096d77d3b76d /drivers/clocksource | |
| parent | 520ddad4e560423a320bc1861792da19b0b879f9 (diff) | |
| download | linux-rpi-08e4b44852626f3549c8bd45308431d9c9e0ee6d.tar.gz linux-rpi-08e4b44852626f3549c8bd45308431d9c9e0ee6d.tar.bz2 linux-rpi-08e4b44852626f3549c8bd45308431d9c9e0ee6d.zip | |
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.c | 10 |
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) |