diff mbox series

[for-8.1,5/6] acpi: x86: remove _ADR on host bridges

Message ID 20230720133858.1974024-6-imammedo@redhat.com
State New
Headers show
Series x86: acpi pci fixes | expand

Commit Message

Igor Mammedov July 20, 2023, 1:38 p.m. UTC 
ACPI spec (since 2.0a) says
"
A device object must contain either an _HID object or
an _ADR object, but can contain both.
"

_ADR is used when device is attached to an ennumerable bus,
however hostbridge is not and uses dedicated _HID for
discovery, drop _ADR field.

It doesn't seem that having _ADR has a negative effects
OSes manage to tolerate that, but there is no point of
having it there. (only pc/q35 has it hostbridge description,
while others (microvm/arm) don't)

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/i386/acpi-build.c | 3 ---
 1 file changed, 3 deletions(-)
diff mbox series

Patch

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 19d268ff59..bb12b0ad43 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1464,7 +1464,6 @@  build_dsdt(GArray *table_data, BIOSLinker *linker,
         sb_scope = aml_scope("_SB");
         dev = aml_device("PCI0");
         aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A03")));
-        aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
         aml_append(dev, aml_name_decl("_UID", aml_int(pcmc->pci_root_uid)));
         aml_append(dev, aml_pci_edsm());
         aml_append(sb_scope, dev);
@@ -1479,7 +1478,6 @@  build_dsdt(GArray *table_data, BIOSLinker *linker,
         dev = aml_device("PCI0");
         aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A08")));
         aml_append(dev, aml_name_decl("_CID", aml_eisaid("PNP0A03")));
-        aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
         aml_append(dev, aml_name_decl("_UID", aml_int(pcmc->pci_root_uid)));
         aml_append(dev, build_q35_osc_method(!pm->pcihp_bridge_en));
         aml_append(dev, aml_pci_edsm());
@@ -1593,7 +1591,6 @@  build_dsdt(GArray *table_data, BIOSLinker *linker,
                 aml_append(pkg, aml_eisaid("PNP0A08"));
                 aml_append(pkg, aml_eisaid("PNP0A03"));
                 aml_append(dev, aml_name_decl("_CID", pkg));
-                aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
                 build_cxl_osc_method(dev);
             } else if (pci_bus_is_express(bus)) {
                 aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A08")));