[Intel-gfx] [PATCH] drm/i915: Disable primary plane if we fail to reconstruct BIOS fb

[Chris Wilson]

On Mon, Nov 23, 2015 at 08:48:32AM -0800, Matt Roper wrote:
> If we fail to reconstruct the BIOS fb (e.g., because the FB is too
> large), we'll be left with plane state that indicates the primary plane
> is visible yet has a NULL fb.  This mismatch causes problems later on
> (e.g., for the watermark code).  Since we've failed to reconstruct the
> BIOS FB, the best solution is to just disable the primary plane and
> pretend the BIOS never had it enabled.
> 
> Cc: Daniel Vetter <daniel at ffwll.ch>
> Cc: Ville Syrjälä <ville.syrjala at intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>

There are a bunch of bugzillas open about this as it is a regression
from about 3.2.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre