[Bug 69119] [hsw] WAIT_FOR_EVENT hangs (full screen vsync on pipe 1 with BCS)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69119

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 8ff8eb2b38dc705f5c86f524c1cd74a811a7b04c
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Sep 9 16:23:04 2013 +0100

    sna/hsw: Scanline waits require both DERRMR and forcewake

    Oh my, bspec is missing a few details on how to perform a scanline wait
    on Haswell. But by using the extra steps required for Ivybridge, we can
    successfully send events from the scanout to the BCS ring. Sadly this
    again means that to use vsync on Haswell requires preventing the GPU
    from sleeping whilst it waits for the scanout to advance.

    Reported-by: Dan Doel <dan.doel at gmail.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=69119
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

That seemed to fix it for my test cases (windowed swaps on all 3 pipes), please
do reopen if it is still broken for you.

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