linux-kernel - Re: [patch 4/8] rtc: core: Make the sync offset default more realistic

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Date:   Fri, 11 Dec 2020 01:28:51 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        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>
Subject: Re: [patch 4/8] rtc: core: Make the sync offset default more
 realistic

On 11/12/2020 01:23:57+0100, Thomas Gleixner wrote:
> Alexandre,
> 
> On Fri, Dec 11 2020 at 00:59, Alexandre Belloni wrote:
> > On 06/12/2020 22:46:17+0100, Thomas Gleixner wrote:
> >>  	/* Drivers can revise this default after allocating the device. */
> >> -	rtc->set_offset_nsec =  NSEC_PER_SEC / 2;
> >> +	rtc->set_offset_nsec =  10 * NSEC_PER_MSEC;
> >
> > I did retest, on a slow 100kHz i2c bus, with a fairly inconvenient RTC,
> > The maximum offset to set the RTC was 4845533ns so I'd say 10ms is too
> > large. Should we make that 5ms ?
> 
> Sure. As I said I pulled the 10 out of thin air.
> 
> > Apart from that, on the series, you can add my
> > Acked-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> 
> I'll amend the s/10/5/ throughout the series while queueing the whole
> pile in the timers/core branch unless you want it to be handled
> differently.
> 

That's fine for me.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com