mb/google/link: Enable libgfxinit

Beside the high-resolution eDP panel, it features a dual-mode
mini-DP port.

Change-Id: Iae60c1f930f5778ee3b5d9d19227168257e9ae06
Tested-by: Matt DeVillier <matt.devillier@gmail.com>
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/22125
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>

src/mainboard/google/link/Kconfig

@@ -16,6 +16,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select SERIRQ_CONTINUOUS_MODE
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
 	select HAVE_LINEAR_FRAMEBUFFER if MAINBOARD_DO_NATIVE_VGA_INIT
+	select MAINBOARD_HAS_LIBGFXINIT
 
 config VBOOT
 	select EC_GOOGLE_CHROMEEC_SWITCHES

src/mainboard/google/link/Makefile.inc

@@ -20,6 +20,7 @@ ramstage-y += chromeos.c
 ramstage-$(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT) += i915.c
 ramstage-$(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT) += i915io.c
 ramstage-$(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT) += intel_dp.c
+ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
 
 smm-$(CONFIG_HAVE_SMI_HANDLER) += mainboard_smi.c
 SPD_BIN = $(obj)/spd.bin

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

@@ -0,0 +1,25 @@
+--
+-- 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
+--
+
+with HW.GFX.GMA;
+with HW.GFX.GMA.Display_Probing;
+
+use HW.GFX.GMA;
+use HW.GFX.GMA.Display_Probing;
+
+private package GMA.Mainboard is
+
+   ports : constant Port_List :=
+     (Internal,
+      DP3,
+      HDMI3,
+      others => Disabled);
+
+end GMA.Mainboard;