Comment 44 for bug 714719

commit e28f87116503f796aba4fb27d81e2c3d81966174
Author: Chris Wilson <email address hidden>
Date: Mon Jul 18 13:11:49 2011 -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 <email address hidden>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=36326
    Signed-off-by: Chris Wilson <email address hidden>
    Cc: <email address hidden>
    Reviewed-by: Daniel Vetter <email address hidden>
    Signed-off-by: Keith Packard <email address hidden>