mb/google/slippy: Hook up libgfxinit

Both HDMI and eDP work (simultaneously).

TESTED on Acer C720 (peppy).

Change-Id: Ifc4e3c187bcabd8965d9586237a52b440bfa7f20
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/17916
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins)

src/mainboard/google/slippy/Kconfig

@@ -17,6 +17,7 @@ config BOARD_GOOGLE_BASEBOARD_SLIPPY
 	select INTEL_DP if (BOARD_GOOGLE_FALCO || BOARD_GOOGLE_PEPPY)
 	select INTEL_DDI if (BOARD_GOOGLE_FALCO || BOARD_GOOGLE_PEPPY)
 	select INTEL_INT15
+	select MAINBOARD_HAS_LIBGFXINIT
 
 if BOARD_GOOGLE_BASEBOARD_SLIPPY
 

src/mainboard/google/slippy/Makefile.inc

@@ -23,4 +23,7 @@ smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
 romstage-y += variants/$(VARIANT_DIR)/romstage.c
 
 subdirs-y += variants/$(VARIANT_DIR)
+
+ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
+
 CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/variants/$(VARIANT_DIR)/include

src/mainboard/google/slippy/gma-mainboard.ads

@@ -0,0 +1,26 @@
+--
+-- Copyright (C) 2016 Arthur Heymans arthur@aheymans.xyz
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+
+with HW.GFX.GMA;
+
+use HW.GFX.GMA;
+
+private package GMA.Mainboard is
+
+   ports : constant Port_List :=
+     (Digital1,
+      Internal,
+      others => Disabled);
+
+end GMA.Mainboard;