[Bug 101910] [BYT] ES31-CTS.functional.copy_image.non_compressed.viewclass_96_bits.rgb32f_rgb32f

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101910

--- Comment #7 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
I made originally a mistake in comparing batch buffer dumps. There is a valign
2 vs.4 difference in one of the surfaces but this is actually insignificant to
the problem in hand. Whereas ISL opts to use valign of 2 for X-tiled RGBA_UNORM
old miptree logic chose 4. Both seem to work, ISL just uses a little less
space.

The difference in case of RGB32F is tiling - ISL falls back to X-tiling while
old i965 uses Y-tiling. The last hack of mine changed this allowing ISL to keep
on using Y-tiling. The fact that it changed valign from 2 to 4 is actually
wrong but for some reason didn't upset the hardware.

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