drm/i915: Clarify the semantics of tiling_changed
Rename obj->tiling_changed to obj->fence_dirty so that it is clear that it flags when the parameters for an active fence (including the no-fence) register are changed. Also, do not set this flag when the object does not have a fence register allocated currently and the gpu does not depend upon the unfence. This case works exactly like when a tiled object lost its fence and hence does not need additional handling for the tiling change in the code. v2: Use fence_dirty to better express what the flag tracks and add a few more details to the comments to serve as a reminder of how the GPU also uses the unfenced register slot. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> [danvet: Add some bikeshed to the commit message about the stricter use of fence_dirty.] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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