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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HSW Regression]S4 causes Call Trace"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78424#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HSW Regression]S4 causes Call Trace"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78424">bug 78424</a>
from <span class="vcard"><a class="email" href="mailto:lei.a.liu@intel.com" title="liulei <lei.a.liu@intel.com>"> <span class="fn">liulei</span></a>
</span></b>
<pre>==Bisect results==
----------------------------
branch : drm-intel-next-queued
Bisect shows: 0882dae983707455e97479e5e904e37673517ebc is the first bad commit
commit 0882dae983707455e97479e5e904e37673517ebc
Author: Paulo Zanoni <<a href="mailto:paulo.r.zanoni@intel.com">paulo.r.zanoni@intel.com</a>>
AuthorDate: Wed Jan 8 11:12:27 2014 -0200
Commit: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
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: <a href="mailto:stable@vger.kernel.org">stable@vger.kernel.org</a>
Bugzilla: <a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED FIXED - [HSW desktop mobile bisected] ddi pll tracking botch-up due to vt-switchless resume"
href="show_bug.cgi?id=64379">https://bugs.freedesktop.org/show_bug.cgi?id=64379</a>
Tested-by: Qingshuai Tian <<a href="mailto:qingshuai.tian@intel.com">qingshuai.tian@intel.com</a>>
Signed-off-by: Paulo Zanoni <<a href="mailto:paulo.r.zanoni@intel.com">paulo.r.zanoni@intel.com</a>>
Signed-off-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>></pre>
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