Update LANE_KEEP_ASSIST_ENABLED documentation in HAL
Temporary errors should be conveyed through ErrorState values in the
STATE property.
Bug: 264946157
Test: presubmit
Change-Id: I1ac2d570ff47efb879acdef110e9775baf6cea4b
diff --git a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
index 2d393e3..8f52d85 100644
--- a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
@@ -3595,6 +3595,11 @@
* This is different from Lane Centering Assist (LCA) which, when activated, applies continuous
* steering control to keep the vehicle centered in the current lane.
*
+ * In general, LANE_KEEP_ASSIST_ENABLED should always return true or false. If the feature is
+ * not available due to some temporary state, such as the vehicle speed being too low or too
+ * high, that information must be conveyed through the ErrorState values in the
+ * LANE_KEEP_ASSIST_STATE property.
+ *
* This property is defined as read_write, but OEMs have the option to implement it as read
* only.
*