drm/i915: Fix i915_ggtt_view_equal to handle rotation correctly
authorDaniel Vetter <daniel.vetter@ffwll.ch>
Wed, 14 Oct 2015 14:51:06 +0000 (16:51 +0200)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Thu, 19 Nov 2015 15:42:06 +0000 (16:42 +0100)
commitce7f172856396d92e82cb0eae420f4ce41c92851
tree877f5af676aa9e9194f6c18a72d87b0a8340758d
parenta6d09186fa27dea720ddd668a814cb6e4f78d53b
drm/i915: Fix i915_ggtt_view_equal to handle rotation correctly

The rotated view depends upon the rotation paramters, but thus far we
didn't bother checking for those. This seems to have been an issue
ever since this was introduce in

commit fe14d5f4e5468c5b80a24f1a64abcbe116143670
Author: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Date:   Wed Dec 10 17:27:58 2014 +0000

    drm/i915: Infrastructure for supporting different GGTT views per object

But userspace is allowed to reuse framebuffer backing storage with
different framebuffers with different pixel formats/stride/whatever.
And e.g. SNA indeed does this. Hence we must check for all the
paramters to match, not just that it's rotated.

v2: intel_plane_obj_offset also needs to construct the full view, to
avoid fallout since they don't fully match.

Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1444834266-12689-3-git-send-email-daniel.vetter@ffwll.ch
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/i915_gem_gtt.h
drivers/gpu/drm/i915/intel_display.c