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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#c9">Comment # 9</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:bugs@mblankhorst.nl" title="Maarten Lankhorst <bugs@mblankhorst.nl>"> <span class="fn">Maarten Lankhorst</span></a>
</span></b>
<pre>You can't increase the vblank evasion time to a value above ~16 ms because of
physics. :)
Assuming the problem is inside i915, there are 2 solutions, one easy and one
hard..
1. Use the DOUBLE_BUFFER_CTL register to lock out updates, like above. Least
amount of lines of code changed.
2. Grab dev_priv->uncore.lock in pipe_update_start and release it in
pipe_update_end. All register updates need this lock so grabbing it would
reduce contention.
I've posted the first solution to intel-gfx as a RFC, and to see if it passes
our CI:
<a href="https://patchwork.freedesktop.org/series/37879/">https://patchwork.freedesktop.org/series/37879/</a></pre>
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