Change in coreboot[master]: soc/intel/tigerlake: Hide PMC and IOM devices

[Michał Kopeć (Code Review)]

Michał Kopeć has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/62492 )

Change subject: soc/intel/tigerlake: Hide PMC and IOM devices
......................................................................

soc/intel/tigerlake: Hide PMC and IOM devices

Windows complains on missing drivers for these ACPI devices. Hide them
from OS as it doesn't influence the hardware operation. Linux can
still probe the drivers correctly.

TEST=Boot Windows 11 and see there are no devices with missing drivers.
Boot Ubuntu 20.04 and check that drivers corresponding to ACPI HIDs are
still probed.

Signed-off-by: Michał Kopeć 
Change-Id: I6c30c08ab730749bddef7ea67c7470c1554bd572
---
M src/soc/intel/tigerlake/acpi/tcss.asl
M src/soc/intel/tigerlake/pmc.c
2 files changed, 4 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/92/62492/1

diff --git a/src/soc/intel/tigerlake/acpi/tcss.asl b/src/soc/intel/tigerlake/acpi/tcss.asl
index 1d58bfb..b349d54 100644
--- a/src/soc/intel/tigerlake/acpi/tcss.asl
+++ b/src/soc/intel/tigerlake/acpi/tcss.asl
@@ -336,6 +336,8 @@
    	Name (_CRS, ResourceTemplate () {
    		Memory32Fixed (ReadWrite, IOM_BASE_ADDRESS, IOM_BASE_SIZE)
    	})
+		/* Hide the device so that Windows will nto complain on missing driver */
+		Name (_STA, 0xB)
    }

/*
diff --git a/src/soc/intel/tigerlake/pmc.c b/src/soc/intel/tigerlake/pmc.c
index 937943a..9ab28c2 100644
--- a/src/soc/intel/tigerlake/pmc.c
+++ b/src/soc/intel/tigerlake/pmc.c
@@ -106,6 +106,8 @@

acpigen_write_name_string("_HID", PMC_HID);
    acpigen_write_name_string("_DDN", "Intel(R) Tiger Lake IPC Controller");
+	/* Hide the device so that Windows will nto complain on missing driver */
+	acpigen_write_STA(ACPI_STATUS_DEVICE_HIDDEN_ON);

/*
     * Part of the PCH's reserved 32 MB MMIO range (0xFC800000 - 0xFE7FFFFF).