linux-kernel - Re: [PATCH] power: supply: axp288_fuel_gauge: Add the ECS EF20EA to the blacklist

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAB4CAwcwrVEoYwPaVYo_TQ-v9qqEe1DrdqgBkm+wot9ehAT+xg@mail.gmail.com>
Date:   Thu, 10 Dec 2020 11:25:15 +0800
From:   Chris Chiu <chiu@...lessos.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     sre@...nel.org, wens@...e.org, Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        linux@...lessos.org
Subject: Re: [PATCH] power: supply: axp288_fuel_gauge: Add the ECS EF20EA to
 the blacklist

On Wed, Dec 9, 2020 at 10:57 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Hi,
>
> On 12/9/20 5:50 AM, Chris Chiu wrote:
> > The ECS EF20EA laptop ships an AXP288 but it is actually using a
> > different, separate FG chip for AC and battery monitoring. On this
> > laptop we need to keep using the regular ACPI driver and disable the
> > AXP288 FG to avoid reporting two batteries to userspace.
> >
> > Signed-off-by: Chris Chiu <chiu@...lessos.org>
> > ---
> >  drivers/power/supply/axp288_fuel_gauge.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/drivers/power/supply/axp288_fuel_gauge.c b/drivers/power/supply/axp288_fuel_gauge.c
> > index 148eb8105803..a15c322c79ea 100644
> > --- a/drivers/power/supply/axp288_fuel_gauge.c
> > +++ b/drivers/power/supply/axp288_fuel_gauge.c
> > @@ -739,6 +739,12 @@ static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = {
> >                       DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
> >               }
> >       },
> > +     {
> > +             /* ECS EF20 */
> > +             .matches = {
> > +                     DMI_MATCH(DMI_PRODUCT_NAME, "EF20"),
> > +             },
> > +     },
> >       {}
> >  };
>
> The axp288_fuel_gauge_blacklist already has the following entry:
>
>         {
>                 /* ECS EF20EA */
>                 .matches = {
>                         DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
>                 },
>         },
>
> So is this real entry really necessary? The existing entry
> matches the quirk for this in drivers/acpi/battery.c:
>
>         {
>                 /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
>                 .callback = battery_do_not_check_pmic_quirk,
>                 .matches = {
>                         DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
>                 },
>         },
>
> And the one in drivers/acpi/ac.c:
>
>         {
>                 /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
>                 .callback = ac_do_not_check_pmic_quirk,
>                 .matches = {
>                         DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
>                 },
>         },
>
> So I don't think that this patch is necessary...
>
> Regards,
>
> Hans
>
>

Thanks for pointing that out. We kept this downstreamly for a long time and
didn't notice it's already there.