[Bug 90138] minor font corruption on baytrail since sna: Enable blitting with Y-tiled surfaces

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90138

--- Comment #4 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Chris Wilson from comment #3)
> I hope
> 
> commit 4fdd3a714d380afd3d6425aedbbf2ae20180638b
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Wed Apr 22 14:08:17 2015 +0100
> 
>     sna/gen6+: Discourage use of the BLT with Y-tiling
>     
>     Somewhere, somehow the first glyph character upload into the Y-tiled
>     glyph cache is corrupt since
>     
>     commit 75d87762471e195dddd73056fc6a06e17db1c8b0
>     Author: Chris Wilson <chris at chris-wilson.co.uk>
>     Date:   Fri Apr 17 10:29:28 2015 +0100
>     
>         sna: Enable blitting with Y-tiled surfaces
>     
>     I have not spotted whether it is a missing magic bit or a bad GTT path,
>     but ideally we don't want to switch to BLT along that path anyway (since
>     we are in the middle of rendering with the other engine).
>     
>     Reported-by: Andy Furniss <adf.lists at gmail.com>
>     References: https://bugs.freedesktop.org/show_bug.cgi?id=90138
>     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> 
> sweeps it back under the carpet.

I am still getting the corruption with this.

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