Report the capability of vaCopy support

1. Extend display attribute to HW(display adaptor) attribute , it could be used to report platform related. it does not need vaConfig(Profile ,Entrypoint, ConfigAttributes), all the capability is combined to the vaDisplay.
2. Report vaCopy support, it is a standalone feature , which is related with vaDisplay. not depend on VPP , vaConfig etc.

Signed-off-by: Carl Zhang <[email protected]>

Author: XinfengZhang

va/va.h

@@ -4835,7 +4835,17 @@ VAStatus vaDeassociateSubpicture (
  * brightness etc. in the rendering process.  The application can query what
  * attributes are supported by the driver, and then set the appropriate attributes
  * before calling vaPutSurface()
+ *
+ * Display attributes can also be used to query/set platform or display adaptor (vaDisplay)
+ * related information. These attributes do not depend on vaConfig, and could not be used
+ * for vaPutSurface. Application can use vaQueryDisplayAttributes/vaGetDisplayAttributes
+ * at anytime after vaInitialize, but (for settable attributes) vaSetDisplayAttributes should be
+ * called after vaInitialize and before any other function call.
+ *
+ * To distinguish these two types of display attributes, display adaptor related attributes
+ * should be marked as "HW attribute" in the description.
  */
+
 /* PowerVR IEP Lite attributes */
 typedef enum
 {
@@ -4957,6 +4967,12 @@ typedef enum
      * specify vaPutSurface render area if there is no drawable on the monitor
      */
     VADisplayAttribRenderRect          = 18,
+    /*
+     * HW attribute. read only. specify whether vaCopy support on current HW
+     * The value of each bit should equal to 1 << VA_EXEC_MODE_XXX to represent
+     * modes of vaCopy
+     */
+    VADisplayAttribCopy                 = 19,
 } VADisplayAttribType;
 
 /* flags for VADisplayAttribute */