[Bug 81200] [BYT Regression]igt/pm_rpm/debugfs-forcewake-user causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81200

--- Comment #3 from liulei <lei.a.liu at intel.com> ---
==Bisect results==
----------------------------
Bisect shows: 13cf550448b58abf8f44f5d6a560f2d20871c965 is the first bad commit
commit 13cf550448b58abf8f44f5d6a560f2d20871c965
Author:     Dave Airlie <airlied at redhat.com>
AuthorDate: Wed Jun 18 11:29:35 2014 +1000
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Mon Jul 7 15:08:51 2014 +0200

    drm/i915: rework digital port IRQ handling (v2)

    The digital ports from Ironlake and up have the ability to distinguish
    between long and short HPD pulses. Displayport 1.1 only uses the short
    form to request link retraining usually, so we haven't really needed
    support for it until now.

    However with DP 1.2 MST we need to handle the short irqs on their
    own outside the modesetting locking the long hpd's involve. This
    patch adds the framework to distinguish between short/long to the
    current code base, to lay the basis for future DP 1.2 MST work.

    This should mean we get better bisectability in case of regression
    due to the new irq handling.

    v2: add GM45 support (untested, due to lack of hw)

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