linux-kernel - RFC: [PATCH] clocksource: tcb: fix min

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Message-Id: <1366722524-25991-1-git-send-email-mkl@pengutronix.de>
Date:	Tue, 23 Apr 2013 15:08:44 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Andres Salomon <dilinger@...ued.net>, arm@...nel.org,
	John Stultz <john.stultz@...aro.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: RFC: [PATCH] clocksource: tcb: fix min_delta calculation

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 with schedule_delayed_work() with a delay of
"1". Resulting in the work not scheduled in time.

This patch fixes the problem by increasing the min_delta to "2" ticks.

Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 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);
 }
-- 
1.8.2.rc2

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