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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [HSW] *ERROR* crtc 21: Can't calculate constants, dotclock = 0!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91428#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [HSW] *ERROR* crtc 21: Can't calculate constants, dotclock = 0!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91428">bug 91428</a>
from <span class="vcard"><a class="email" href="mailto:patrik.r.jakobsson@gmail.com" title="Patrik Jakobsson <patrik.r.jakobsson@gmail.com>"> <span class="fn">Patrik Jakobsson</span></a>
</span></b>
<pre>I sent out a patch for this some time ago which Maarten also fixed up.
Basically the encoders need to be read out before the planes. And after that
stage we copy over the dotclock which will make this error go away.
<a href="http://lists.freedesktop.org/archives/intel-gfx/2015-August/073028.html">http://lists.freedesktop.org/archives/intel-gfx/2015-August/073028.html</a></pre>
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