The commit
77cc982 clocksource: use clockevents_config_and_register() where possible
switches from manually calculating min_delta_ns (and others) and
clockevents_register_device() to automatic calculation via
clockevents_config_and_register(). During this conversation the "+ 1" in
min_delta_ns = clockevent_delta2ns(1, &clkevt.clkevt) + 1;
was lost. This leads to problems when programming clock events, resuling in
e.g. a sleep(2) sleeping more than 3 seconds. The "+ 1" was added in the
original code to fix a rounding problem in clockevent_delta2ns(), see
http://permalink.gmane.org/gmane.linux.kernel/549744 for background
information.
This patch fixes the problem by increasing the min_delta to "2" ticks.
Cc: Marc Pignat <marc.pig...@hevs.ch>
Cc: Ronald Wahl <ronald.w...@raritan.com>
Acked-by: Shawn Guo <shawn....@linaro.org>
Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de>
---
Changes since v1:
- Improved description. Thanks to Ronald Wahl.
drivers/clocksource/tcb_clksrc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index 8a61872..7cf6dc7 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -197,7 +197,7 @@ static void __init setup_clkevents(struct atmel_tc *tc, int
clk32k_divisor_idx)
clkevt.clkevt.cpumask = cpumask_of(0);
- clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff);
+ clockevents_config_and_register(&clkevt.clkevt, 32768, 2, 0xffff);
setup_irq(irq, &tc_irqaction);
}
--
1.8.4.rc3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
