[Bug 90253] [SNB]System fails to suspend from second time in "drm_suspend_s3" test

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90253

xubin <bin.a.xu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #3 from xubin <bin.a.xu at intel.com> ---
Test with the latest drm-intel-nightly kernel(commit
2a36ab374449e3794b4be6be01f1a47cb6ee5b83)on SNB platform,the issue still exist.
Bisect result:
Bisect shows 5c5f645773b6d147bf68c350674dc3ef4f8de83d is the first bad commit.
commit 5c5f645773b6d147bf68c350674dc3ef4f8de83d
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Apr 14 17:35:14 2015 +0200

    drm/i915: Unify aliasing ppgtt handling

    With the dynamic pagetable alloc code aliasing ppgtt special-cases
    where again mixed in all over the place with the low-level init code.

    Extract the va preallocation and clearing again into the common code
    where aliasing ppgtt gets set up.

    Note that with this we don't set the size of the aliasing ppgtt to the
    size of the parent ggtt address space. Which isn't required at all
    since except for the ppgtt setup/cleanup code no one ever looks at
    this.

    Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>

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