[PATCHv5 10/10] clocksource: sun4i: Fix bug when switching from periodic to oneshot modes

From: Maxime Ripard
Date: Thu Jul 11 2013 - 12:31:49 EST


The interval was firing at was set up at probe time, and only changed in
the set_next_event, and never changed back, which is not really what is
expected.

When enabling the periodic mode, now set an interval to tick every
jiffy.

Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
---
drivers/clocksource/sun4i_timer.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c
index 2fadb3b..8ead025 100644
--- a/drivers/clocksource/sun4i_timer.c
+++ b/drivers/clocksource/sun4i_timer.c
@@ -38,6 +38,7 @@
#define TIMER_CNTVAL_REG(val) (0x10 * (val) + 0x18)

static void __iomem *timer_base;
+static u32 ticks_per_jiffy;

/*
* When we disable a timer, we need to wait at least for 2 cycles of
@@ -74,7 +75,8 @@ static void sun4i_clkevt_time_start(u8 timer, bool periodic)
else
val |= TIMER_CTL_ONESHOT;

- writel(val | TIMER_CTL_ENABLE, timer_base + TIMER_CTL_REG(timer));
+ writel(val | TIMER_CTL_ENABLE | TIMER_CTL_RELOAD,
+ timer_base + TIMER_CTL_REG(timer));
}

static void sun4i_clkevt_mode(enum clock_event_mode mode,
@@ -83,6 +85,7 @@ static void sun4i_clkevt_mode(enum clock_event_mode mode,
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
sun4i_clkevt_time_stop(0);
+ sun4i_clkevt_time_setup(0, ticks_per_jiffy);
sun4i_clkevt_time_start(0, true);
break;
case CLOCK_EVT_MODE_ONESHOT:
@@ -169,9 +172,9 @@ static void __init sun4i_timer_init(struct device_node *node)
clocksource_mmio_init(timer_base + TIMER_CNTVAL_REG(1), node->name,
rate, 300, 32, clocksource_mmio_readl_down);

- writel(rate / HZ, timer_base + TIMER_INTVAL_REG(0));
+ ticks_per_jiffy = DIV_ROUND_UP(rate, HZ);

- writel(TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M) | TIMER_CTL_RELOAD,
+ writel(TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M),
timer_base + TIMER_CTL_REG(0));

ret = setup_irq(irq, &sun4i_timer_irq);
--
1.8.3.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/