<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <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#c47">Comment # 47</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 <a class="email" href="mailto:bugs@mblankhorst.nl" title="Maarten Lankhorst <bugs@mblankhorst.nl>"> Maarten Lankhorst</a> <pre>Because there's no way to do so. Everything between intel_pipe_update_begin and intel_pipe_update_end must complete within 100/250 us, or we end up with flickering on the screen. The only thing we can alter is to take all locks in advance, to make the update itself limited to writing out a list of registers. But even then we need to complete within 250 us, or we risk running into an underrun. But it seems the underlying hangs were fixed by enabling IPC support on BXT+.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>