From 2c6a725e2bcdbb9bbdcb08bbbffd0d2884dab39a Mon Sep 17 00:00:00 2001
From: Matt DeVillier <matt.devillier@gmail.com>
Date: Tue, 21 Apr 2020 01:20:29 -0500
Subject: [PATCH] mb/google/octopus: Add ACPI backlight controls
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Enables backlight control under Windows 10.

Test: build/boot Windows 10 20H2 on google/ampton, verify
display backlight controls functional.

Change-Id: I779f7f3f5a111018fc7b5c50c5750a9eb815d670
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40594
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
---
 src/mainboard/google/octopus/dsdt.asl                         | 1 +
 src/mainboard/google/octopus/variants/baseboard/devicetree.cb | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/mainboard/google/octopus/dsdt.asl b/src/mainboard/google/octopus/dsdt.asl
index f87b96282e..513db663fe 100644
--- a/src/mainboard/google/octopus/dsdt.asl
+++ b/src/mainboard/google/octopus/dsdt.asl
@@ -25,6 +25,7 @@ DefinitionBlock(
 			#include <soc/intel/apollolake/acpi/northbridge.asl>
 			#include <soc/intel/apollolake/acpi/southbridge.asl>
 			#include <soc/intel/apollolake/acpi/pch_hda.asl>
+			#include <drivers/intel/gma/acpi/default_brightness_levels.asl>
 		}
 	}
 
diff --git a/src/mainboard/google/octopus/variants/baseboard/devicetree.cb b/src/mainboard/google/octopus/variants/baseboard/devicetree.cb
index cbcd48aab4..3dbc5ef080 100644
--- a/src/mainboard/google/octopus/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/octopus/variants/baseboard/devicetree.cb
@@ -112,7 +112,9 @@ chip soc/intel/apollolake
 		device pci 00.0 on  end	# - Host Bridge
 		device pci 00.1 on  end	# - DPTF
 		device pci 00.2 off end	# - NPK
-		device pci 02.0 on  end	# - Gen
+		device pci 02.0 on	# - Gen
+			register "gfx" = "GMA_DEFAULT_PANEL(0)"
+		end
 		device pci 03.0 on  end # - Gaussian Mixture Model (GMM)
 		device pci 0c.0 on
 			chip drivers/wifi/generic