linux-kernel - RE: [PATCH] ACPI: Parse entire table as a term_list for Dell XPS 9570 and Precision M5530

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Date:   Tue, 30 Jan 2018 19:03:09 +0000
From:   <Mario.Limonciello@...l.com>
To:     <erik.schmauss@...el.com>, <andy.shevchenko@...il.com>,
        <kai.heng.feng@...onical.com>
CC:     <rjw@...ysocki.net>, <lenb@...nel.org>,
        <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <robert.moore@...el.com>
Subject: RE: [PATCH] ACPI: Parse entire table as a term_list for Dell XPS 9570
 and Precision M5530



> -----Original Message-----
> From: Schmauss, Erik [mailto:erik.schmauss@...el.com]
> Sent: Tuesday, January 30, 2018 12:38 PM
> To: Andy Shevchenko <andy.shevchenko@...il.com>; Kai-Heng Feng
> <kai.heng.feng@...onical.com>
> Cc: Rafael J. Wysocki <rjw@...ysocki.net>; Len Brown <lenb@...nel.org>; ACPI
> Devel Maling List <linux-acpi@...r.kernel.org>; Linux Kernel Mailing List <linux-
> kernel@...r.kernel.org>; Limonciello, Mario <Mario_Limonciello@...l.com>;
> Moore, Robert <robert.moore@...el.com>
> Subject: RE: [PATCH] ACPI: Parse entire table as a term_list for Dell XPS 9570 and
> Precision M5530
> 
> Hi,
> > -----Original Message-----
> > From: linux-acpi-owner@...r.kernel.org [mailto:linux-acpi-
> > owner@...r.kernel.org] On Behalf Of Andy Shevchenko
> > Sent: Tuesday, January 30, 2018 10:18 AM
> > To: Kai-Heng Feng <kai.heng.feng@...onical.com>
> > Cc: Rafael J. Wysocki <rjw@...ysocki.net>; Len Brown <lenb@...nel.org>; ACPI
> > Devel Maling List <linux-acpi@...r.kernel.org>; Linux Kernel Mailing List <linux-
> > kernel@...r.kernel.org>; Mario Limonciello <mario.limonciello@...l.com>
> > Subject: Re: [PATCH] ACPI: Parse entire table as a term_list for Dell XPS 9570 and
> > Precision M5530
> >
> > On Tue, Jan 30, 2018 at 8:07 AM, Kai-Heng Feng
> > <kai.heng.feng@...onical.com> wrote:
> > > The i2c touchpad on Dell XPS 9570 and Precision M5530 doesn't work out
> > > of box.
> > >
> > > The touchpad relies on its _INI method to update its _HID value from
> > > XXXX0000 to SYNA2393.
> > > Also, the _STA relies on value of I2CN to report correct status.
> > >
> > > Set acpi_gbl_parse_table_as_term_list so the value of I2CN can be
> > > correctly set up, and _INI can get run. The ACPI table in this machine
> > > is designed to get parsed this way.
> 
> I thought I would give everyone an update: we are getting close to finishing patches
> to enable this term list parsing by default as well as a few other fixes with forward
> referencing of package elements. Once we have established that these patches are
> stable, we will get rid of acpi_gbl_parse_table_as_term_list. So this quirk may not
> be needed in the near future...

Rafael,

Would you be opposed to carrying a patch similar to this (proposed) quirk patch in 
kernel and reverting when Erik submits patches that get rid of
acpi_gbl_parse_table_as_term_list?

The reason being, I think this could also be a candidate to bring back to @stable
and fix this problem on earlier kernels too.

I don’t believe the patches that get rid of acpi_gbl_parse_table_as_term_list likely
will be good candidates for @stable.


> 
> Erik
> > >
> > > Also, change the quirk table to a more generic name.
> >
> > > +static int set_gbl_term_list(const struct dmi_system_id *id) {
> > > +       pr_notice("%s detected - parse the entire table as a term_list\n",
> > > +                 id->ident);
> > > +       acpi_gbl_parse_table_as_term_list = 1;
> > > +       return 0;
> > > +}
> > >  #endif
> >
> > The above should be outside of another #ifdef. Basically after the above #endif.
> >
> > >  #else
> >
> > >  #endif
> >
> > > @@ -1005,7 +1034,7 @@ void __init acpi_early_init(void)
> >
> > >          * If the machine falls into the DMI check table,
> > >          * DSDT will be copied to memory
> > >          */
> >
> > It might make sense to adjust comment above that it's about quirks in general.
> > And, if needed, move current content to actual DMI group of records.
> >
> > > -       dmi_check_system(dsdt_dmi_table);
> > > +       dmi_check_system(acpi_quirks_dmi_table);
> >
> > --
> > With Best Regards,
> > Andy Shevchenko
> > --
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