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

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Message-ID: <51768885.4080301@pengutronix.de>
Date:	Tue, 23 Apr 2013 15:11:33 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
CC:	Shawn Guo <shawn.guo@...aro.org>, 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>
Subject: Re: RFC: [PATCH] clocksource: tcb: fix min_delta calculation

On 04/23/2013 03:08 PM, Marc Kleine-Budde wrote:
> 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>

The problem appears on at91sam9263. This patch successfully fixes the
problem and applies to current linus/master (post v3.9-rc8).

regards,
Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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