1 files changed, 6 insertions, 0 deletions

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 67cebe6d978f..67ef73a5d6eb 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1079,6 +1079,12 @@ struct drm_i915_gem_context_destroy {
 };
 
 struct drm_i915_reg_read {
+        /*
+         * Register offset.
+         * For 64bit wide registers where the upper 32bits don't immediately
+         * follow the lower 32bits, the offset of the lower 32bits must
+         * be specified
+         */
         __u64 offset;
         __u64 val; /* Return value */
 };