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Subject[PATCH v8 3/6] clocksource: stm32: increase min delta value
Date
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(-)

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);
--
2.7.4
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