linux-kernel - Re: [External] Re: [PATCH 0/4] power: supply: add charge_behaviour property (force-discharge, inhibit-charge)

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Message-ID: <a0b82de2-827a-96e8-15c2-b1393ee8a705@lenovo.com>
Date:   Wed, 17 Nov 2021 13:20:41 -0500
From:   Mark Pearson <markpearson@...ovo.com>
To:     Thomas Weißschuh <linux@...ssschuh.net>,
        Thomas Koch <linrunner@....net>
CC:     <linux-pm@...r.kernel.org>, Sebastian Reichel <sre@...nel.org>,
        <ibm-acpi-devel@...ts.sourceforge.net>,
        <platform-driver-x86@...r.kernel.org>,
        Mark Gross <markgross@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        <linux-kernel@...r.kernel.org>, <bberg@...hat.com>,
        <hadess@...ess.net>, <nicolopiazzalunga@...il.com>,
        <njoshi1@...ovo.com>, <smclt30p@...il.com>
Subject: Re: [External] Re: [PATCH 0/4] power: supply: add charge_behaviour
 property (force-discharge, inhibit-charge)

Hi Thomas,


On 2021-11-17 12:57, Thomas Weißschuh wrote:
> On 2021-11-16 17:56+0100, Thomas Koch wrote:
>> thank you very much for working on this. It is high time that we leave
>> external kernel modules for ThinkPads behind us.
>>
>> On 13.11.21 11:42, Thomas Weißschuh wrote:
>>> Hi,
>>>
>>> this series adds support for the charge_behaviour property to the power
>>> subsystem and thinkpad_acpi driver.
>>>
>>> As thinkpad_acpi has to use the 'struct power_supply' created by the generic
>>> ACPI driver it has to rely on custom sysfs attributes instead of proper
>>> power_supply properties to implement this property.
>>>
>>> Patch 1: Adds the power_supply documentation and basic public API
>>> Patch 2: Adds helpers to power_supply core to help drivers implement the
>>>    charge_behaviour attribute
>>> Patch 3: Adds support for force-discharge to thinkpad_acpi.
>>> Patch 4: Adds support for inhibit-discharge to thinkpad_acpi.
>>>
>>> Patch 3 and 4 are largely taken from other patches and adapted to the new API.
>>> (Links are in the patch trailer)
>>>
>>> Ognjen Galic, Nicolo' Piazzalunga, Thomas Koch:
>>>
>>> Your S-o-b is on the original inhibit_charge and force_discharge patches.
>>> I would like to add you as Co-developed-by but to do that it will also require
>>> your S-o-b. Could you give your sign-offs for the new patches, so you can be
>>> properly attributed?
>> S-o-b/Co-developed-by/Tested-by is fine with me.
>>
>> I tested your patches.
>>
>> Hardware:
>>
>> - ThinkPad X220, BAT0
>> - ThinkPad T450s, BAT0+BAT1
>> - ThinkPad X1C6, BAT0
>>
>> Test Results:
>>
>> 1. force-discharge
>>
>> Everythings works as expected
>> - Writing including disengaging w/ "auto" : OK
>> - Reading: OK
>>
>> - Battery discharging: OK
>> - Disengaging with "auto": OK
>>
>> 2. inhibit-charge
>>
>> Works as expected:
>> - Writing: OK
>>
>> - Disengaging with "auto": OK
>>
>>
>> Discrepancies:
>> - Battery charge inhibited: BAT0 OK, BAT1 no effect e.g. continues charging
>> - Reading: always returns "auto"
> 
> I tested it on a T460s with two batteries and there inhibit-charge works
> fine for both batteries.
> What does not work is setting force-discharge for both batteries at the same
> time.
> This makes somewhat sense as on a physical level probably only one of them can
> be used at a time.
> 
> Mark Pearson: Could you confirm that this is the intended behaviour?
> 
Confirmed - only one battery can be used with the BDSS command