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<body><span class="vcard"><a class="email" href="mailto:li.l.xu@intel.com" title="Li Xu <li.l.xu@intel.com>"> <span class="fn">Li Xu</span></a>
</span> changed
<a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [BSW regression] eDP goes black after running tesdisplay"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86268">bug 86268</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEEDINFO
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<td>ASSIGNED
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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [BSW regression] eDP goes black after running tesdisplay"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86268#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [BSW regression] eDP goes black after running tesdisplay"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86268">bug 86268</a>
from <span class="vcard"><a class="email" href="mailto:li.l.xu@intel.com" title="Li Xu <li.l.xu@intel.com>"> <span class="fn">Li Xu</span></a>
</span></b>
<pre>(In reply to Brian Lovin from <a href="show_bug.cgi?id=86268#c9">comment #9</a>)
<span class="quote">> Here's what I've found for the bad commit; it appears to be in the middle of
> a patch series Ville commited - Someone will have to take a look at what's
> going on.
>
> 093e3f134e2eff13503f708b81aecc2501e7aecb is the first bad commit
> commit 093e3f134e2eff13503f708b81aecc2501e7aecb
> Author: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
> Date: Thu Oct 16 21:27:33 2014 +0300
>
> drm/i915: Hold the pps mutex across the whole panel power enable sequence
>
>
> This commit doesn't revert cleanly on drm-intel-testing from 11/7, which was
> all I had time to test for now.</span >
We have tried with Brian's result, and find it can light up ,and after
testdisplay screen can light up.
I finished the bisect, the result is following:
baa4e575d6a18dcd6f2e622784aa16ab24024f09 is the first bad commit
commit baa4e575d6a18dcd6f2e622784aa16ab24024f09
Author: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
Date: Mon Oct 27 16:07:32 2014 +0200
drm/i915: Enable pipe-a power well on chv
It seems that the pipe-a power well has replaced the disp2d power well
on chv. At least that's the case with the current punit firmware. So
enable the pipe-a power and expand its domains to cover everything the
disp2d well ought to cover.
The other power wells (apart from the cmnlane wells) still seem awol
in the current punit firmware. So leave them disabled in the code.
This fixes a hilarious oops during resume on bsw where
intel_hdmi_get_config() would read the port register and get back
0xffffffff and thus think the port is enabled on pipe D. It would then
go and index the pipe_to_crtc_mapping[] array with PIPE_D and blow up
when intel_hdmi_get_config() tries to write to crtc->config. Someone
really ought to replace all naked pipe_to_crtc_mapping[] uses with the
appropriate function call so we could add a warning there if the pipe
doesn't actually exist...
We must also call the power seqeuencer state reset function from
the pipe-a well disable just like we do from disp2d on vlv. Otherwise
the eDP panel won't recover at resume time since the PPS has lost its
hold on the port.
Bugzilla: <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [BSW] System fail to enter S3 with system hang up after load i915 driver"
href="show_bug.cgi?id=84903">https://bugs.freedesktop.org/show_bug.cgi?id=84903</a>
Signed-off-by: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
Reviewed-by: Jesse Barnes <<a href="mailto:jbarnes@virtuousgeek.org">jbarnes@virtuousgeek.org</a>>
Signed-off-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>></pre>
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