[Bug 74053] [ivb] hang on pageflip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74053

--- Comment #8 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Created attachment 93135
  --> https://bugs.freedesktop.org/attachment.cgi?id=93135&action=edit
One potential idea

I tried to look through our gen7 page flip code. Looks like everything's
according to spec, except we allow the MI_DISPLAY_FLIP to straddle two
cachelines. This patch fixes that. Worth a shot I suppose even if the hanging
flip in the error state didn't hit this. There were flips in the ring that
would have hit this though.

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