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>

diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c
index 8ead0258740a82dc71807bd323f5b1eb9d1535a5..46008f9f49ad0966f0de2f3b73980f82771465fb 100644 (file)
--- a/drivers/clocksource/sun4i_timer.c
+++ b/drivers/clocksource/sun4i_timer.c
@@ -37,6 +37,8 @@
 #define TIMER_INTVAL_REG(val)  (0x10 * (val) + 0x14)
 #define TIMER_CNTVAL_REG(val)  (0x10 * (val) + 0x18)
 
+#define TIMER_SYNC_TICKS       3
+
 static void __iomem *timer_base;
 static u32 ticks_per_jiffy;
 
@@ -50,7 +52,7 @@ static void sun4i_clkevt_sync(void)
 {
        u32 old = readl(timer_base + TIMER_CNTVAL_REG(1));
 
-       while ((old - readl(timer_base + TIMER_CNTVAL_REG(1))) < 3)
+       while ((old - readl(timer_base + TIMER_CNTVAL_REG(1))) < TIMER_SYNC_TICKS)
                cpu_relax();
 }
 
@@ -104,7 +106,7 @@ static int sun4i_clkevt_next_event(unsigned long evt,
                                   struct clock_event_device *unused)
 {
        sun4i_clkevt_time_stop(0);
-       sun4i_clkevt_time_setup(0, evt);
+       sun4i_clkevt_time_setup(0, evt - TIMER_SYNC_TICKS);
        sun4i_clkevt_time_start(0, false);
 
        return 0;
@@ -187,8 +189,8 @@ static void __init sun4i_timer_init(struct device_node *node)
 
        sun4i_clockevent.cpumask = cpumask_of(0);
 
-       clockevents_config_and_register(&sun4i_clockevent, rate, 0x1,
-                                       0xffffffff);
+       clockevents_config_and_register(&sun4i_clockevent, rate,
+                                       TIMER_SYNC_TICKS, 0xffffffff);
 }
 CLOCKSOURCE_OF_DECLARE(sun4i, "allwinner,sun4i-timer",
                       sun4i_timer_init);