[Intel-gfx] [PATCH 2/4] drm/i915: preserve swizzle settings if necessary v4

[Daniel Vetter]

On Thu, Oct 09, 2014 at 12:57:43PM -0700, Jesse Barnes wrote:
> Some machines (like MBAs) might use a tiled framebuffer but not enable
> display swizzling at boot time.  We want to preserve that configuration
> if possible to prevent a boot time mode set.  On IVB+ it shouldn't
> affect performance anyway since the memory controller does internal
> swizzling anyway.
> 
> For most other configs we'll be able to enable swizzling at boot time,
> since the initial framebuffer won't be tiled, thus we won't see any
> corruption when we enable it.
> 
> v2: preserve swizzling if BIOS had it set (Daniel)
> v3: preserve swizzling only if we inherited a tiled framebuffer (Daniel)
>     check display swizzle setting in detect_bit_6_swizzle (Daniel)
>     use gen6 as cutoff point (Daniel)
> v4: fixup swizzle preserve again, had wrong init order (Daniel)
> 
> Reported-by: Kristian Høgsberg <hoegsberg at gmail.com>
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>

lgtm. Queued for -next, thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch