coreboot_tables: specify clear interface for lb_framebuffer()

For some reason the "interface" for adding framebuffer information
is sitting in src/include/vbe.h while also guarding the call to
fill_lb_framebuffer() with vbe_mode_info_valid() along with some
macro if CONFIG_* for good measure.

Move the fill_lb_framebuffer() declaration to coreboot_tables.h and
provide a comment about how it should be used. Also, now that
there's no need for the notion of a global vbe_mode_info_valid()
remove it from the conditional call path of fill_lb_framebuffer().

Change-Id: Ib3ade6314624091ae70424664527a02b279d0c9b
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/19729
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

1 files changed, 5 insertions, 8 deletions

diff --git a/src/drivers/intel/gma/text_fb/gma.adb b/src/drivers/intel/gma/text_fb/gma.adb
index 5df203b580..6453571d8c 100644
--- a/src/drivers/intel/gma/text_fb/gma.adb
+++ b/src/drivers/intel/gma/text_fb/gma.adb
@@ -11,16 +11,13 @@ with GMA.Mainboard;
 package body GMA
 is
 
-   function vbe_mode_info_valid return Interfaces.C.int
+   function fill_lb_framebuffer
+     (framebuffer : in out lb_framebuffer)
+      return Interfaces.C.int
    is
+      use type Interfaces.C.int;
    begin
-      return 0;
-   end vbe_mode_info_valid;
-
-   procedure fill_lb_framebuffer (framebuffer : out lb_framebuffer)
-   is
-   begin
-      null;
+      return -1;
    end fill_lb_framebuffer;
 
    ----------------------------------------------------------------------------