drm: Mention the power state requirement on side-channel operations

[linux-2.6-microblaze.git] / include / drm / drm_dp_helper.h

diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 9336bfb..729d5d8 100644 (file)
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1950,6 +1950,11 @@ struct drm_dp_aux {
         * The @transfer() function must only modify the reply field of
         * the &drm_dp_aux_msg structure. The retry logic and i2c
         * helpers assume this is the case.
+        *
+        * Also note that this callback can be called no matter the
+        * state @dev is in. Drivers that need that device to be powered
+        * to perform this operation will first need to make sure it's
+        * been properly enabled.
         */
        ssize_t (*transfer)(struct drm_dp_aux *aux,
                            struct drm_dp_aux_msg *msg);