linux-kernel - Re: [PATCH v3] power: supply: sbs-battery: Handle unsupported PROP_TIME_TO_EMPTY

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Date: Fri, 19 Apr 2024 09:26:41 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 Sebastian Reichel <sre@...nel.org>
Cc: kernel@...labora.com, linux-pm@...r.kernel.org,
 linux-kernel@...r.kernel.org, Pin-yen Lin <treapking@...omium.org>,
 Hsin-Te Yuan <yuanhsinte@...omium.org>
Subject: Re: [PATCH v3] power: supply: sbs-battery: Handle unsupported
 PROP_TIME_TO_EMPTY_NOW

Il 18/04/24 19:34, Nícolas F. R. A. Prado ha scritto:
> Despite the RunTimeToEmpty() (0x11) function being defined in the SBS
> specification as required, it seems that not all batteries implement it.
> On platforms with such batteries, reading the property will cause an
> error to be printed:
> 
> power_supply sbs-8-000b: driver failed to report `time_to_empty_now' property: -5
> 
> This not only pollutes the log, distracting from real problems on the
> device, but also prevents the uevent file from being read since it
> contains all properties, including the faulty one.
> 
> The following table summarizes the findings for a handful of platforms:
> 
> Platform                                Status  Manufacturer    Model
> ------------------------------------------------------------------------
> mt8186-corsola-steelix-sku131072        OK      BYD             L22B3PG0
> mt8195-cherry-tomato-r2                 NOT OK  PANASON         AP16L5J
> mt8192-asurada-spherion-r0              NOT OK  PANASON         AP15O5L
> mt8183-kukui-jacuzzi-juniper-sku16      NOT OK  LGC KT0         AP16L8J
> mt8173-elm-hana                         OK      Sunwoda         L18D3PG1
> sc7180-trogdor-lazor-limozeen-nots-r5   NOT OK  Murata          AP18C4K
> sc7180-trogdor-kingoftown               NOT OK  333-AC-0D-A     GG02047XL
> rk3399-gru-kevin                        OK      SDI             4352D51
> 
> Detect if this is one of the quirky batteries during presence update, so
> that hot-plugging works as expected, and if so report -ENODATA for
> POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, which removes it from uevent and
> prevents throwing errors.
> 
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Nícolas, please, I think that sending this commit to stable for backporting
makes a lot of sense since you're actually fixing laptops (that does not
really require a Fixes tag) that are supported upstream since .. lots of time
ago.

In any case, this LGTM.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>