From: Linus Walleij <linus.walleij@linaro.org>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Alexandre Courbot <gnurou@gmail.com>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Darren Hart <dvhart@linux.intel.com>,
Arnd Bergmann <arnd@arndb.de>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>
Subject: Re: [RFC PATCH] gpio: support for GPIO forwarding
Date: Wed, 4 Feb 2015 10:51:27 +0100 [thread overview]
Message-ID: <CACRpkdbpJXHih0-Yhpi=AjvVjxZwEAhqe_iBWbd=5Cjz+sQZxQ@mail.gmail.com> (raw)
In-Reply-To: <2116821.DVmvasqCz1@vostro.rjw.lan>
On Fri, Jan 30, 2015 at 5:17 PM, Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
> On Friday, January 30, 2015 03:48:30 PM Linus Walleij wrote:
>> So you could detect one by making a checksum of the binary or something.
>>
>> And then you'd know that the table with this checksum needs patching?
>
> At a single table level it is generally difficult to say whether or not
> things are going to work.
>
> What needs to work is the namespace which is built from all of the tables
> provided combined. So the namespace needs to be populated first and then
> fixes applied on top of that (presumably by deleting, adding or replacing
> objects).
>
> Now, in theory, you *may* be able to figure out that combination of tables
> A produces namespace B which then will require fix X if the system is Y,
> but quite frankly I wouldn't count on that.
>
> Moreover, fixups (or "patches" as I called them, but that wasn't exactly
> correct) need to be provided in the form of AML definition blocks to apply on
> top of an already populated namespace and if you want to use a binary kernel image,
> you can't really afford putting all that stuff for all systems it can possibly
> run on into it. This means that distros need to be able to combine a fixup for
> the ACPI tables with the binary kernel and install the result into the system's
> boot medium (whatever it is). Also it should be possible to update the fixup
> and the kernel image separately if necessary.
>
> Now from the kernel's perspective that raises the question: "What if the
> ACPI tables fixup provided by the distro is not sufficient?"
>
> That needs to be addressed somehow in the code.
Yeah I guess I'm convinced that we need to handle this particular
weirdness in the gpio-acpi code... if it can be contained there as
expressed by Alexandre.
Yours,
Linus Walleij
next prev parent reply other threads:[~2015-02-04 9:51 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-18 8:23 [RFC PATCH] gpio: support for GPIO forwarding Heikki Krogerus
2015-01-08 8:25 ` Heikki Krogerus
2015-01-15 9:21 ` Rafael J. Wysocki
2015-01-14 12:58 ` Linus Walleij
2015-01-14 16:32 ` Darren Hart
2015-01-15 9:28 ` Rafael J. Wysocki
2015-01-15 9:40 ` Heikki Krogerus
2015-01-14 16:32 ` Darren Hart
2015-01-19 5:59 ` Alexandre Courbot
2015-01-19 11:53 ` Heikki Krogerus
2015-01-20 12:16 ` Linus Walleij
2015-01-20 21:25 ` Rafael J. Wysocki
2015-01-22 2:57 ` Alexandre Courbot
2015-01-22 16:14 ` Rafael J. Wysocki
2015-01-23 11:21 ` Heikki Krogerus
2015-01-23 15:14 ` Rafael J. Wysocki
2015-01-26 13:06 ` Heikki Krogerus
2015-02-10 9:32 ` Alexandre Courbot
2015-02-10 15:10 ` Rafael J. Wysocki
2015-02-12 12:46 ` Heikki Krogerus
2015-02-24 20:34 ` David Cohen
2015-02-25 1:34 ` Alexandre Courbot
2015-02-25 18:25 ` David Cohen
2015-03-07 22:13 ` Linus Walleij
2015-01-22 8:17 ` Linus Walleij
2015-01-22 16:12 ` Rafael J. Wysocki
2015-01-30 14:48 ` Linus Walleij
2015-01-30 16:17 ` Rafael J. Wysocki
2015-02-04 9:51 ` Linus Walleij [this message]
2015-02-04 14:11 ` Heikki Krogerus
2015-02-10 9:44 ` Alexandre Courbot
2015-02-12 12:38 ` Heikki Krogerus
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