1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 6fdd42704533..414d325f28d3 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -522,6 +522,11 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
 
         mutex_lock(&dev->struct_mutex);
 
+        /* Note that this will apply the VT-d workaround for scanouts,
+         * which is more restrictive than required for sprites. (The
+         * primary plane requires 256KiB alignment with 64 PTE padding,
+         * the sprite planes only require 128KiB alignment and 32 PTE padding.
+         */
         ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
         if (ret)
                 goto out_unlock;