From 667d8af08adbd4f2154dfb3032698f961b9cfcdd Mon Sep 17 00:00:00 2001
From: Matt DeVillier <matt.devillier@gmail.com>
Date: Sat, 7 Jan 2017 23:46:41 -0600
Subject: [PATCH] mb/google/rambi: use ACPI backlight controls

All variants except NINJA have a built-in display.
Enables ACPI brightness controls under Windows.

Change-Id: I8dd026608de606fa33f28ccb2967f3beb83b3470
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40119
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
---
 src/mainboard/google/rambi/devicetree.cb                  | 3 +++
 src/mainboard/google/rambi/dsdt.asl                       | 1 +
 src/mainboard/google/rambi/variants/ninja/overridetree.cb | 3 +++
 3 files changed, 7 insertions(+)

diff --git a/src/mainboard/google/rambi/devicetree.cb b/src/mainboard/google/rambi/devicetree.cb
index dc11ec8a91..c7bc0b66f2 100644
--- a/src/mainboard/google/rambi/devicetree.cb
+++ b/src/mainboard/google/rambi/devicetree.cb
@@ -1,5 +1,8 @@
 chip soc/intel/baytrail
 
+	# IGD Displays
+	register "gfx" = "GMA_STATIC_DISPLAYS(0)"
+
 	# SATA port enable mask (2 ports)
 	register "sata_port_map" = "0x1"
 	register "sata_ahci" = "0x1"
diff --git a/src/mainboard/google/rambi/dsdt.asl b/src/mainboard/google/rambi/dsdt.asl
index 3a8d1a1a30..347269fa15 100644
--- a/src/mainboard/google/rambi/dsdt.asl
+++ b/src/mainboard/google/rambi/dsdt.asl
@@ -36,6 +36,7 @@ DefinitionBlock(
 		{
 			//#include <soc/intel/baytrail/acpi/northcluster.asl>
 			#include <soc/intel/baytrail/acpi/southcluster.asl>
+			#include <drivers/intel/gma/acpi/default_brightness_levels.asl>
 		}
 
 		/* Dynamic Platform Thermal Framework */
diff --git a/src/mainboard/google/rambi/variants/ninja/overridetree.cb b/src/mainboard/google/rambi/variants/ninja/overridetree.cb
index 3f67644d79..47527da2b3 100644
--- a/src/mainboard/google/rambi/variants/ninja/overridetree.cb
+++ b/src/mainboard/google/rambi/variants/ninja/overridetree.cb
@@ -1,5 +1,8 @@
 chip soc/intel/baytrail
 
+	# No Built-in IGD Display
+	register "gfx.ndid" = "0"
+
 	register "usb2_comp_bg" = "0x4700"
 
 	# Allow PCIe devices to wake system from suspend