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

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Thu, 2014-01-16 at 10:29 +0100, Linus Walleij wrote:
> On Thu, Jan 16, 2014 at 2:49 AM, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
> > Adding in the appropriate people...
> >
> > On Tue, Jan 14, 2014 at 7:01 PM, One Thousand Gnomes
> > <gnomes@lxorguk.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@linux.intel.com>
Intel Finland Oy