drm/i915: Rotated view does not need a fence

We do not need to set up a fence for the rotated view.

Display does not need it and no one can access it.

v2: Move code to __i915_vma_set_map_and_fenceable. (Chris Wilson)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: 05a20d09 ("drm/i915: Move map-and-fenceable tracking to the VMA")
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
(cherry picked from commit 07ee2bce)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/i915_gem.c

@@ -3745,7 +3745,12 @@ void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 	mappable = (vma->node.start + fence_size <=
 		    dev_priv->ggtt.mappable_end);
 
-	if (mappable && fenceable)
+	/*
+	 * Explicitly disable for rotated VMA since the display does not
+	 * need the fence and the VMA is not accessible to other users.
+	 */
+	if (mappable && fenceable &&
+	    vma->ggtt_view.type != I915_GGTT_VIEW_ROTATED)
 		vma->flags |= I915_VMA_CAN_FENCE;
 	else
 		vma->flags &= ~I915_VMA_CAN_FENCE;