tree 9fb1ef4243707e686a3c1a512931942562267e64
parent 435793dfb8aec7b2e19f72d5bce8a22fd0b57839
author Chris Wilson <chris@chris-wilson.co.uk> 1311019909 -0700
committer Keith Packard <keithp@keithp.com> 1311022926 -0700

drm/i915: Fix unfenced alignment on pre-G33 hardware

Align unfenced buffers on older hardware to the power-of-two object
size.  The docs suggest that it should be possible to align only to a
power-of-two tile height, but using the already computed fence size is
easier and always correct. We also have to make sure that we unbind
misaligned buffers upon tiling changes.

In order to prevent a repetition of this bug, we change the interface
to the alignment computation routines to force the caller to provide
the requested alignment and size of the GTT binding rather than assume
the current values on the object.

Reported-and-tested-by: Sitosfe Wheeler <sitsofe@yahoo.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=36326
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Keith Packard <keithp@keithp.com>