linux-kernel - Re: [patch 5/8] ntp: Make the RTC synchronization more reliable

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Message-ID: <87lfcz7pem.fsf@nanos.tec.linutronix.de>
Date:   Mon, 11 Jan 2021 11:12:49 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        John Stultz <john.stultz@...aro.org>,
        Prarit Bhargava <prarit@...hat.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        linux-rtc@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [patch 5/8] ntp: Make the RTC synchronization more reliable

On Tue, Dec 29 2020 at 20:41, Geert Uytterhoeven wrote:
> Hi Thomas,
>> Reported-by: Miroslav Lichvar <mlichvar@...hat.com>
>> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>
> Thanks for your patch, which is now commit c9e6189fb03123a7 ("ntp: Make
> the RTC synchronization more reliable").
>
> Since this commit, the I2C RTC on the R-Car M2-W Koelsch development
> board is accessed every two seconds.  Sticking a WARN() in the I2C
> activation path gives e.g.

Huch? Every two seconds? The timer is armed with 11 * 60 * NSEC_PER_SEC,
which is 11 minutes. Confused....

Thanks,

        tglx