[XS] Change in coreboot[main]: soc/intel/{adl,tgl}: Set IOM ACPI device to hidden/on

[Matt DeVillier (Code Review)]

Attention is currently required from: Dinesh Gehlot, Intel coreboot Reviewers, Jayvik Desai, Kapil Porwal, Nick Vaccaro, Subrata Banik.

Matt DeVillier has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/86257?usp=email )

Change subject: soc/intel/{adl,tgl}: Set IOM ACPI device to hidden/on
......................................................................

soc/intel/{adl,tgl}: Set IOM ACPI device to hidden/on

This prevents Windows from displaying the IOM device in Device Manager
as an unknown device with no driver available, and brings Alderlake
and Tigerlake in line with Meteorlake and Pantherlake.

TEST=build/boot Win11 on starlabs/starlite_adl, verify IOM device
not shown as unknown device in Device Manager.

Change-Id: Ib31018173126737b36a6e0d822eba2ebc9c42306
Signed-off-by: Matt DeVillier 
---
M src/soc/intel/alderlake/acpi/tcss.asl
M src/soc/intel/tigerlake/acpi/tcss.asl
2 files changed, 4 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/57/86257/1

diff --git a/src/soc/intel/alderlake/acpi/tcss.asl b/src/soc/intel/alderlake/acpi/tcss.asl
index 6f8edda..2d09c64 100644
--- a/src/soc/intel/alderlake/acpi/tcss.asl
+++ b/src/soc/intel/alderlake/acpi/tcss.asl
@@ -331,7 +331,8 @@
    	Name (_CRS, ResourceTemplate () {
    		Memory32Fixed (ReadWrite, IOM_BASE_ADDRESS, IOM_BASE_SIZE)
    	})
-		Name (_STA, 0xF)
+		/* ACPI_STATUS_DEVICE_HIDDEN_ON */
+		Name (_STA, 0xB)
    }

/*
diff --git a/src/soc/intel/tigerlake/acpi/tcss.asl b/src/soc/intel/tigerlake/acpi/tcss.asl
index 588ed5e..f02a4a3 100644
--- a/src/soc/intel/tigerlake/acpi/tcss.asl
+++ b/src/soc/intel/tigerlake/acpi/tcss.asl
@@ -331,7 +331,8 @@
    	Name (_CRS, ResourceTemplate () {
    		Memory32Fixed (ReadWrite, IOM_BASE_ADDRESS, IOM_BASE_SIZE)
    	})
-		Name (_STA, 0xF)
+		/* ACPI_STATUS_DEVICE_HIDDEN_ON */
+		Name (_STA, 0xB)
    }

/*