[Intel-gfx] Intel graphics corruption

[Chris Wilson]

On Fri, Dec 05, 2014 at 11:29:09PM -0600, Fennec Fox wrote:
> well on my arch machine with an intel gma 4 graphics card using
> xfree86-video-intel   im seeing lots of graphics corruption  i can
> give images it it would help

I presume you filed https://bugs.freedesktop.org/show_bug.cgi?id=87065
and so know by that this was fixed by

commit 656bfa3afc14e45e2d9e1624bf60d79b3beb12f2
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Nov 20 09:26:30 2014 +0100

    drm/i915: Pin tiled objects for L-shaped configs
    
    Let's just throw in the towel on this one and take the cheap way out.
    
    Based on a patch from Chris Wilson, but checking for a different bit.
    Chris' patch checked for even bank layout, this one here for a magic
    bit. Given the evidence we've gathered (not much) both work I think,
    but checking for the magic bit might be more accurate.
    
    Anyway, works on my gm45 here.
    
    For paranoi restrict to gen4 (and mobile), since we've only ever seen
    this on gm45 and i965gm.
    
    Also add some debugfs output so that we can skip the tiled swapping
    tests properly in these cases.
    
    v2: Clean up the quirk'ed pin count in free_object to avoid upsetting
    the WARN_ON. Spotted by Chris.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre