mb/51nb/x210: add libgfxinit support

Derived from x210_test branch of HarryKipper's repo:
https://github.com/harrykipper/coreboot

Test: build/boot x210, test eDP, MiniDP, VGA outputs

Change-Id: Ie2b79b236a458ebd243c992d6e615e41930eeb50
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39106
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/mainboard/51nb/x210/Kconfig

@@ -6,6 +6,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select EC_51NB_NPCE985LA0DX
 	select HAVE_ACPI_RESUME
 	select HAVE_ACPI_TABLES
+	select MAINBOARD_HAS_LIBGFXINIT
 	select SOC_INTEL_COMMON_BLOCK_HDA_VERB
 	select SOC_INTEL_KABYLAKE
 	select SPD_READ_BY_WORD

src/mainboard/51nb/x210/Makefile.inc

@@ -2,3 +2,4 @@
 # This file is part of the coreboot project.
 
 ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_HDA_VERB) += hda_verb.c
+ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads

src/mainboard/51nb/x210/devicetree.cb

@@ -1,5 +1,12 @@
 chip soc/intel/skylake
 
+	# Enable Panel as eDP and configure power delays
+	register "gpu_pp_up_delay_ms"		  = "210"	# T3
+	register "gpu_pp_down_delay_ms"		  = "500"	# T10
+	register "gpu_pp_cycle_delay_ms"	  = "5000"	# T12
+	register "gpu_pp_backlight_on_delay_ms"	  = "1"		# T7
+	register "gpu_pp_backlight_off_delay_ms"  = "200"	# T9
+
 	# Enable deep Sx states
 	register "deep_s3_enable_ac" = "1"
 	register "deep_s3_enable_dc" = "1"

src/mainboard/51nb/x210/gma-mainboard.ads

@@ -0,0 +1,18 @@
+-- SPDX-License-Identifier: GPL-2.0-or-later
+-- This file is part of the coreboot project.
+
+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 :=
+     (DP1,
+      DP2,
+      eDP,
+      Others => Disabled);
+
+end GMA.Mainboard;