drm/i915: Make the high dword offset more explicit in i915_reg_read_ioctl

[mirror_ubuntu-bionic-kernel.git] / include / uapi / drm / i915_drm.h

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 67cebe6d978fb77bf1906abf348c3d0abe938ea7..67ef73a5d6ebdffacb32b10dc453afbbabcb5b8d 100644 (file)
--- 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 */
 };