linux-kernel - Re: [PATCH AUTOSEL 5.4 130/350] power: supply: cpcap-battery: Check voltage before orderly

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Date:   Thu, 12 Dec 2019 13:17:47 +0100
From:   Pavel Machek <pavel@....cz>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Tony Lindgren <tony@...mide.com>,
        Merlijn Wajer <merlijn@...zup.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.4 130/350] power: supply: cpcap-battery: Check
 voltage before orderly_poweroff

On Tue 2019-12-10 16:03:55, Sasha Levin wrote:
> From: Tony Lindgren <tony@...mide.com>
> 
> [ Upstream commit 639c1524da3b273d20c42ff2387d08eb4b12e903 ]
> 
> We can get the low voltage interrupt trigger sometimes way too early,
> maybe because of CPU load spikes. This causes orderly_poweroff() be
> called too easily.
> 
> Let's check the voltage before orderly_poweroff in case it was not
> yet a permanent condition. We will be getting more interrupts anyways
> if the condition persists.
> 
> Let's also show the measured voltages for low battery and battery
> empty warnings since we have them.

This is a tweak of power management parameters, not a fix for serious
bug.

Plus, it needs a lot of testing it did not get, yet.

Please drop from stable.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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