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 20:09:04 +0000
From:   "Moore, Robert" <robert.moore@...el.com>
To:     "Mario.Limonciello@...l.com" <Mario.Limonciello@...l.com>,
        "Schmauss, Erik" <erik.schmauss@...el.com>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "kai.heng.feng@...onical.com" <kai.heng.feng@...onical.com>
CC:     "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ACPI: Parse entire table as a term_list for Dell XPS
 9570 and Precision M5530



> -----Original Message-----
> From: Mario.Limonciello@...l.com [mailto:Mario.Limonciello@...l.com]
> Sent: Tuesday, January 30, 2018 11:03 AM
> To: Schmauss, Erik <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; Moore, Robert <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.
> 


Does anyone remember what was the exact problem that forced the creation of parse_table_as_term_list in the first place?

Bob


> 
> >
> > 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
> > > --
> > > To unsubscribe from this list: send the line "unsubscribe
> > > linux-acpi" in the body of a message to majordomo@...r.kernel.org
> > > More majordomo info at http://vger.kernel.org/majordomo-info.html