linux-kernel - Re: [PATCH] RTC: RK808: Work around hardware bug on November 31st

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Message-ID: <CAODwPW8XmGkPNTw4y_UG7Qy4P1B6y4VH6MOHi1905S_VCrnTPg@mail.gmail.com>
Date:	Mon, 7 Dec 2015 17:41:39 -0800
From:	Julius Werner <jwerner@...omium.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Julius Werner <jwerner@...omium.org>,
	Chris Zhong <zyw@...k-chips.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Sonny Rao <sonnyrao@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	rtc-linux@...glegroups.com,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: Re: [PATCH] RTC: RK808: Work around hardware bug on November 31st

> Technically you could still implement this and if firmware happens to
> read the RTC (and doesn't correct things) then we won't be able to
> correct things.  ...but certainly if you read the old time and then
> the new time and the old time was < 11/31 and the new time was >=
> 11/31 you know you need to correct.
>
> I'd say that there's a good chance that other firmware (UBoot) doesn't
> actually read the RTC anyway.  Why would it?  We only do it for even
> log, right?

Hah! Sounds like you assume U-Boot was doing the things it does with
comprehensible reasoning. From my experience, that's a dangerous wager
(not that I'm biased or anything... ;) ). FWIW, they seem to be having
a huge (175kloc, of only the finest copied kernel code from 10+ years
ago, I presume) repository of RTC drivers, a separate command line
command to read/write to it, and an SNTP client.

Still, you're right that adding the GET_TIME check wouldn't hurt... at
worst it just does nothing. I'll try it out.
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