[v8,3/6] clocksource: stm32: increase min delta value

Message ID 1510649563-22975-4-git-send-email-benjamin.gaignard@linaro.org
State New
Headers show
Series
  • stm32 clocksource driver rework
Related show

Commit Message

Benjamin Gaignard Nov. 14, 2017, 8:52 a.m.
The CPU is a CortexM4 @ 200MHZ and the clocks driving
the timers are at 90MHZ with a min delta at 1 you could
have an interrupt each 0.01 ms which is really to much.
By increase it to 0x60 it give more time (around 1 ms)
to CPU to handle the interrupt.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>

---
 drivers/clocksource/timer-stm32.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

-- 
2.7.4

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Patch

diff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c
index fc61fd1..ae41a19 100644
--- a/drivers/clocksource/timer-stm32.c
+++ b/drivers/clocksource/timer-stm32.c
@@ -36,6 +36,8 @@ 
 
 #define TIM_EGR_UG	BIT(0)
 
+#define MIN_DELTA	0x60
+
 static int stm32_clock_event_shutdown(struct clock_event_device *evt)
 {
 	struct timer_of *to = to_timer_of(evt);
@@ -129,7 +131,7 @@  static int __init stm32_clockevent_init(struct device_node *node)
 	writel_relaxed(0, timer_of_base(to) + TIM_SR);
 
 	clockevents_config_and_register(&to->clkevt,
-					timer_of_period(to), 0x1, max_delta);
+					timer_of_period(to), MIN_DELTA, max_delta);
 
 	pr_info("%pOF: STM32 clockevent driver initialized (%d bits)\n",
 			node, bits);