drivers/intel/gma: Export Read_EDID() to C

Change-Id: Icf802904c569e621ca3b3105b6107936776c5cee
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31458
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/drivers/intel/gma/gma.adb b/src/drivers/intel/gma/gma.adb
new file mode 100644
index 0000000000..10885e6e09
--- /dev/null
+++ b/src/drivers/intel/gma/gma.adb
@@ -0,0 +1,37 @@
+with HW.GFX.GMA;
+with HW.GFX.GMA.Display_Probing;
+
+use HW.GFX.GMA;
+
+package body GMA is
+
+   function read_edid
+     (raw_edid :    out HW.GFX.EDID.Raw_EDID_Data;
+      port     : in     Interfaces.C.int)
+      return Interfaces.C.int
+   is
+      use type Interfaces.C.int;
+      success : Boolean := true;
+   begin
+      if port not in Active_Port_Type'Pos (Active_Port_Type'First)
+                     .. Active_Port_Type'Pos (Active_Port_Type'Last)
+      then
+         raw_edid := (others => 0);
+         return -2;
+      else
+         if not HW.GFX.GMA.Is_Initialized then
+            HW.GFX.GMA.Initialize (Success => success);
+         end if;
+         if success then
+            HW.GFX.GMA.Display_Probing.Read_EDID
+              (raw_edid, Active_Port_Type'Val (port), success);
+         end if;
+         if success then
+            return 0;
+         else
+            return -1;
+         end if;
+      end if;
+   end read_edid;
+
+end GMA;