linux-kernel - Re: [PATCHv3] RTC: RK808: Compensate for Rockchip calendar deviation on November 31st

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Message-ID: <CAODwPW9JP_DhKC73f5CWcMkkOM=KX3M8v7y0cke0y13Ywcxv_w@mail.gmail.com>
Date:	Fri, 18 Dec 2015 16:31:32 -0800
From:	Julius Werner <jwerner@...omium.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Julius Werner <jwerner@...omium.org>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Sonny Rao <sonnyrao@...omium.org>,
	Chris Zhong <zyw@...k-chips.com>,
	Heiko Stuebner <heiko@...ech.de>,
	LKML <linux-kernel@...r.kernel.org>, rtc-linux@...glegroups.com
Subject: Re: [PATCHv3] RTC: RK808: Compensate for Rockchip calendar deviation
 on November 31st

> There's actually a real world case that's pretty common where we want
> to work with dates before 2016.  When I power cycle my device and it
> totally loses battery, I notice that the firmware seems to start as:
>
>  2013-01-21 00:50:02
>
> It's possible we could need to run for a while in this state and we
> possibly could even need alarms to fire.  ...but that's nowhere near
> the problematic dates and presumably someone wouldn't have a system in
> the "clock set totally wrong" state for a really long time.

Yeah... I don't think it really makes much sense to worry about that.
At that point it's much more likely that you will loose an alarm
because the user finally fixes the clock at some point (either
manually or by connecting to a network and having some automated sync
service jump in), and we never worry about something like that either.
I mean, fixing it wouldn't be a big deal (another 5 lines or so
maybe), but I just don't think it's worth adding any complexity.
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