[Bug 78424] [HSW Regression]S4 causes Call Trace

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78424

--- Comment #2 from liulei <lei.a.liu at intel.com> ---
==Bisect results==
----------------------------
branch : drm-intel-next-queued
Bisect shows: 0882dae983707455e97479e5e904e37673517ebc is the first bad commit

commit 0882dae983707455e97479e5e904e37673517ebc
Author:     Paulo Zanoni <paulo.r.zanoni at intel.com>
AuthorDate: Wed Jan 8 11:12:27 2014 -0200
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Wed Jan 8 15:54:09 2014 +0100

    drm/i915: fix DDI PLLs HW state readout code

    Properly zero the refcounts and crtc->ddi_pll_set so the previous HW
    state doesn't affect the result of reading the current HW state.

    This fixes WARNs about WRPLL refcount if we have an HDMI monitor on
    HSW and then suspend/resume.

    Cc: stable at vger.kernel.org
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=64379
    Tested-by: Qingshuai Tian <qingshuai.tian at intel.com>
    Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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