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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Delay in skl_disable_plane() causes a system freeze"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104975#c60">Comment # 60</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Delay in skl_disable_plane() causes a system freeze"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104975">bug 104975</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>(In reply to Azhar from <a href="show_bug.cgi?id=104975#c59">comment #59</a>)
<span class="quote">> (In reply to Ville Syrjala from <a href="show_bug.cgi?id=104975#c58">comment #58</a>)
> > It looks like I managed to avoid the planes staying on past their bedtime
> > with the following branch:
> > git://github.com/vsyrjala/linux.git double_buffer_ctl_ddb_wa
> >
> > I hope it will also prevent the hard hangs. Please test.
>
>
> With this patch on Linux-stable 4.15.18 without the support of IPC on BXT+,
> still causes hard hangs.</span >
Argh. OK, so looks like what I had there is only sufficient for linear buffers
for some unknown reason. To make the planes appear to work correctly with tiled
buffers I had to frob the double buffer disable bits some more between the
ddb/wm and plane programming steps.
I pushed an additional commit to the same branch:
git://github.com/vsyrjala/linux.git double_buffer_ctl_ddb_wa
Please test again.</pre>
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