linux-kernel - Re: Baytrail problems (was Re: Linux 3.13-rc8)

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Date:	Thu, 16 Jan 2014 12:58:28 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Linus Walleij <linus.walleij@...aro.org>,
	"Nyman, Mathias" <mathias.nyman@...el.com>,
	"Westerberg, Mika" <mika.westerberg@...el.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Paul Drews <paul.drews@...el.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Baytrail problems (was Re: Linux 3.13-rc8)

On Thu, 2014-01-16 at 10:29 +0100, Linus Walleij wrote:
> On Thu, Jan 16, 2014 at 2:49 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> > Adding in the appropriate people...
> >
> > On Tue, Jan 14, 2014 at 7:01 PM, One Thousand Gnomes
> > <gnomes@...rguk.ukuu.org.uk> wrote:
> >>
> >> It seems to hate Baytrail/T
> >>
> >> My ASUS T100TA has gone from 3.11 'needs video=VGA-1:blah' to get the mode
> >> right but otherwise running nicely and playing 3D games to 3.13-rc8
> >>
> >> - crashes and burns during boot if the Baytrail pinctrl driver is compiled
> >>   in
> >
> > Andy, Paul? The changes to the pinctrl driver since 3.11 look trivial,
> > but I guess the GPIO and ACPI ID addition ends up also enabling all
> > the old code that Alan probably never ran in 3.11 because the driver
> > didn't trigger on his machine.
> 
> So that is commit f6308b36c411dc5
> "ACPI: Add BayTrail SoC GPIO and LPSS ACPI IDs"?
> 
> This seems to have been selected for -stable as well so the
> problem will be spreading as distros start pushing stable kernel
> updates :-(
> 
> That came in through the ACPI tree, Rafael do you want to
> revert it if there is no better quickfix?

It seems Mathias and Mika (Cc:ed) already heard about the issue and have
been working on the solution.

> 
> This adds an interesting twist to the general statement that
> new PCI/ACPI IDs should go into stable BTW, maybe they
> should not always do that.


-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy

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