ArmPlatformPkg: Implement LcdIdentify function for HDLCD GOP

[mirror_edk2.git] / ArmPlatformPkg / Library / HdLcd / HdLcd.c

diff --git a/ArmPlatformPkg/Library/HdLcd/HdLcd.c b/ArmPlatformPkg/Library/HdLcd/HdLcd.c
index 28306c530e08b5e0fcef4308435045da3c9e093c..039048398c531ec944bc4b43a5551a554a368481 100644 (file)
--- a/ArmPlatformPkg/Library/HdLcd/HdLcd.c
+++ b/ArmPlatformPkg/Library/HdLcd/HdLcd.c
@@ -175,11 +175,17 @@ LcdShutdown (
 \r
   @retval EFI_SUCCESS            Returns success if platform implements a HDLCD\r
                                  controller.\r
+  @retval EFI_NOT_FOUND          HDLCD display controller not found on the\r
+                                 platform.\r
 **/\r
 EFI_STATUS\r
 LcdIdentify (\r
   VOID\r
   )\r
 {\r
-  return EFI_SUCCESS;\r
+  if ((MmioRead32 (HDLCD_REG_VERSION) >> 16) == HDLCD_PRODUCT_ID) {\r
+    return EFI_SUCCESS;\r
+  }\r
+\r
+  return EFI_NOT_FOUND;\r
 }\r