clocksource: sun4i: Report the minimum tick that we can program
We need to wait for at least 2 clock cycles whenever we reprogram our clockevent timer. Report that the minimum number of ticks we can handle is 3 ticks, and remove 3 ticks to the interval programmed to reflect this. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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@ -37,6 +37,8 @@
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#define TIMER_INTVAL_REG(val) (0x10 * (val) + 0x14)
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#define TIMER_CNTVAL_REG(val) (0x10 * (val) + 0x18)
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#define TIMER_SYNC_TICKS 3
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static void __iomem *timer_base;
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static u32 ticks_per_jiffy;
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@ -50,7 +52,7 @@ static void sun4i_clkevt_sync(void)
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{
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u32 old = readl(timer_base + TIMER_CNTVAL_REG(1));
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while ((old - readl(timer_base + TIMER_CNTVAL_REG(1))) < 3)
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while ((old - readl(timer_base + TIMER_CNTVAL_REG(1))) < TIMER_SYNC_TICKS)
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cpu_relax();
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}
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@ -104,7 +106,7 @@ static int sun4i_clkevt_next_event(unsigned long evt,
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struct clock_event_device *unused)
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{
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sun4i_clkevt_time_stop(0);
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sun4i_clkevt_time_setup(0, evt);
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sun4i_clkevt_time_setup(0, evt - TIMER_SYNC_TICKS);
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sun4i_clkevt_time_start(0, false);
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return 0;
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@ -187,8 +189,8 @@ static void __init sun4i_timer_init(struct device_node *node)
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sun4i_clockevent.cpumask = cpumask_of(0);
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clockevents_config_and_register(&sun4i_clockevent, rate, 0x1,
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0xffffffff);
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clockevents_config_and_register(&sun4i_clockevent, rate,
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TIMER_SYNC_TICKS, 0xffffffff);
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}
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CLOCKSOURCE_OF_DECLARE(sun4i, "allwinner,sun4i-timer",
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sun4i_timer_init);
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