Trying to use opengl hardware acceleration on the Weston RDP backend I found 
that the “has_llc” limitation on the “intel_readpixels_tiled_memcpy” fast path 
was avoiding a fast intelPixelRead behavior. I’m using an Intel Bay Trail GEN7, 
so a byt device family with 0x0F31 id (no llc, I gues). What I want to say is 
that this limitation seems not be necessary in this case, as if I bypass it I 
get this fast path running succesfully and the intelReadPixels() function works 
very well and fast.
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