[Bug 91926] [SKL bisected] texsubimage pbo intermittent failures

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91926

--- Comment #33 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
Reversing the mutual order of intel_blit_framebuffer_with_blitter() and
_mesa_meta_BlitFramebuffer() in i965-driver callback for blits fixes the said
newly introduced errors. This setup uses the blitter whenever possible and then
in cases not handled by the blitter prefers glsl-based blit over the software
path which looks to introduce its own set of failures.

With this setup on SKL the original failure of interest manifests itself after
a few testing rounds. On IVB in turn I cannot see failures in the original
piglit test or in my reduced version of it.

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