nb/intel/nehalem,sandybridge: Hook up libgfxinit

Change-Id: I4288193c022cc0963b926b4b43834c222e41bb0d
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/16953
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/northbridge/intel/sandybridge/gma.c b/src/northbridge/intel/sandybridge/gma.c
index 290d066..7021600 100644
--- a/src/northbridge/intel/sandybridge/gma.c
+++ b/src/northbridge/intel/sandybridge/gma.c
@@ -603,8 +603,14 @@
 		physbase = pci_read_config32(dev, 0x5c) & ~0xf;
 		graphics_base = dev->resource_list[1].base;
 
-		int lightup_ok = i915lightup_sandy(&conf->gfx, physbase, iobase,
-						   mmiobase, graphics_base);
+		int lightup_ok;
+		if (IS_ENABLED(CONFIG_MAINBOARD_USE_LIBGFXINIT)) {
+			gma_gfxinit((uintptr_t)mmiobase, graphics_base,
+				    physbase, &lightup_ok);
+		} else {
+			lightup_ok = i915lightup_sandy(&conf->gfx, physbase,
+					iobase, mmiobase, graphics_base);
+		}
 		if (lightup_ok)
 			gfx_set_init_done(1);
 	}