linux-kernel - Re: (subset) [PATCH v2 0/7] rtc: Add support for limited alarm timer offsets

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Date:   Sun, 27 Aug 2023 23:51:07 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Benson Leung <bleung@...omium.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        John Stultz <jstultz@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>
Subject: Re: (subset) [PATCH v2 0/7] rtc: Add support for limited alarm timer
 offsets


On Thu, 17 Aug 2023 15:55:30 -0700, Guenter Roeck wrote:
> Some alarm timers are based on time offsets, not on absolute times.
> In some situations, the amount of time that can be scheduled in the
> future is limited. This may result in a refusal to suspend the system,
> causing substantial battery drain.
> 
> This problem was previously observed on a Chromebook using the cros_ec
> rtc driver. EC variants on some older Chromebooks only support 24 hours
> of alarm time in the future. To work around the problem on affected
> Chromebooks, code to limit the maximum alarm time was added to the cros_ec
> rtc driver with commit f27efee66370 ("rtc: cros-ec: Limit RTC alarm range
> if needed"). The problem is now seen again on a system using the cmos
> RTC driver on hardware limited to 24 hours of alarm time, so a more
> generic solution is needed.
> 
> [...]

Applied, thanks!

[1/7] rtc: Add support for limited alarm timer offsets
      commit: 781589e40ac5f929f58824c15448e1ba49c3ac32
[3/7] rtc: cros-ec: Detect and report supported alarm window size
      commit: 00c3092d881bc9d63dc36eecd140cdb38962c7ec
[4/7] rtc: cmos: Report supported alarm limit to rtc infrastructure
      commit: 2546e7083f2ea96bdd6157961dc2748d65a9e487
[5/7] rtc: tps6586x: Report maximum alarm limit to rtc core
      commit: 3637bbdc8a446b8edb369383d2abc816c96ee864
[6/7] rtc: ds1305: Report maximum alarm limit to rtc core
      commit: 46b79ac0b463e155b098805ff66f1f22ff249b45
[7/7] rtc: rzn1: Report maximum alarm limit to rtc core
      commit: 2b0386d578836b9cd5d2e63cff38b7229c319e4a

Best regards,

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