[PATCH 2/5] drm/i915: preserve swizzle settings if necessary v3

[Jesse Barnes]

On Wed, 11 Jun 2014 17:39:29 +0200
Daniel Vetter <daniel at ffwll.ch> wrote:

> On Wed, Jun 11, 2014 at 5:13 PM, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> >> - If you have a machine which uses tiled framebuffers and enables
> >>   swizzling in the BIOS your code will a) drop the swizzle setup in
> >>   gem_init_hw, breaking resume b) not set the swizzle settings correctly
> >>   in swizzle_detect, breaking swap in/out and pwrite/pread. Not sure such
> >>   a machine exists, but still.
> >
> > This would affect krh's MBA, which is why I wanted testing here...
> > anyway I'll spin a new one and ask krh to test again.
> 
> Hm, I've thought the issue with the MBA is that it used tiled fbs, but
> non-swizzled. And then a mess ensued when we've enabled it. But yeah,
> unfortunately with the new logic we need to retest :(

Ah yeah I think you're right, either way, need more testing.

Maybe we should have just gone with the first patch to never enable
swizzling based on Art's assertion that it didn't matter.

-- 
Jesse Barnes, Intel Open Source Technology Center