Re: Linux 3.16-rc2

[Jani Nikula <jani.nikula@linux.intel.com>]

On Tue, 24 Jun 2014, Thomas Meyer <thomas@m3y3r.de> wrote:
> the i915 driver is still broken in 3.16-rc2. Resume from ram crashes the
> X server.

This is not new to 3.16-rc2; apparently we've had it since v3.15-rc4
[1]. Also related [2].

Chris, any fresh ideas?

Thomas, please consider filing a bug against DRM/Intel at [3]. They will
have a better chance of not being forgotten as the mail thread goes
cold.

Thanks,
Jani.


[1] http://thread.gmane.org/gmane.linux.kernel/1700872
[2] https://bugs.freedesktop.org/show_bug.cgi?id=76554
[3] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI


>
> First bad commit is:
>
> # first bad commit: [78f2975eec9faff353a6194e854d3d39907bab68] drm/i915: Move all ring resets before setting the HWS page
>
> commit 78f2975eec9faff353a6194e854d3d39907bab68
> Author: Chris Wilson <chris@chris-wilson.co.uk>
> Date:   Wed Apr 2 16:36:07 2014 +0100
>
>     drm/i915: Move all ring resets before setting the HWS page
>     
>     In commit a51435a3137ad8ae75c288c39bd2d8b2696bae8f
>     Author: Naresh Kumar Kachhi <naresh.kumar.kachhi@intel.com>
>     Date:   Wed Mar 12 16:39:40 2014 +0530
>     
>         drm/i915: disable rings before HW status page setup
>     
>     we reordered stopping the rings to do so before we set the HWS register.
>     However, there is an extra workaround for g45 to reset the rings twice,
>     and for consistency we should apply that workaround before setting the
>     HWS to be sure that the rings are truly stopped.
>     
>     Reference: http://lkml.kernel.org/r/20140423202248.GA3621@amd.pavel.ucw.cz
>     Tested-by: Pavel Machek <pavel@ucw.cz>
>     Cc: Naresh Kumar Kachhi <naresh.kumar.kachhi@intel.com>
>     Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
>     Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
>     Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>     Signed-off-by: Jani Nikula <jani.nikula@intel.com>
>
> Above commit is not revertable anymore on 3.16-rc2 without conflict.
>
>
>
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-- 
Jani Nikula, Intel Open Source Technology Center