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

[Felix Held (Code Review)]

Felix Held has submitted this change. ( 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
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62492
Tested-by: build bot (Jenkins) 
Reviewed-by: Tim Wawrzynczak 
---
M src/soc/intel/tigerlake/acpi/tcss.asl
M src/soc/intel/tigerlake/pmc.c
2 files changed, 4 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Tim Wawrzynczak: Looks good to me, approved

diff --git a/src/soc/intel/tigerlake/acpi/tcss.asl b/src/soc/intel/tigerlake/acpi/tcss.asl
index 1d58bfb..50307f4 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 does not 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..b8eb307 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 does not complain on missing driver */
+	acpigen_write_STA(ACPI_STATUS_DEVICE_HIDDEN_ON);

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