ACPI / x86: Work around broken XSDT on Advantech DAC-BJ01 board

commit e702196bf85778f2c5527ca47f33ef2e2fca8297 upstream.

On this board the ACPI RSDP structure points to both a RSDT and an XSDT,
but the XSDT points to a truncated FADT. This causes all sorts of trouble
and usually a complete failure to boot after the following error occurs:

  ACPI Error: Unsupported address space: 0x20 (*/hwregs-*)
  ACPI Error: AE_SUPPORT, Unable to initialize fixed events (*/evevent-*)
  ACPI: Unable to start ACPI Interpreter

This leaves the ACPI implementation in such a broken state that subsequent
kernel subsystem initialisations go wrong, resulting in among others
mismapped PCI memory, SATA and USB enumeration failures, and freezes.

As this is an older embedded platform that will likely never see any BIOS
updates to address this issue and its default shipping OS only complies to
ACPI 1.0, work around this by forcing `acpi=rsdt`. This patch, applied on
top of Linux 5.10.102, was confirmed on real hardware to fix the issue.

Signed-off-by: Mark Cilissen <mark@yotsuba.nl>
Cc: All applicable <stable@vger.kernel.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index c3fba8b5275306d1769e18795b0c9bdee0e15e60..28e241e635675229a58065a7a7dc30f10903f219 100644 (file)
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1324,6 +1324,17 @@ static int __init disable_acpi_pci(const struct dmi_system_id *d)
        return 0;
 }
 
+static int __init disable_acpi_xsdt(const struct dmi_system_id *d)
+{
+       if (!acpi_force) {
+               pr_notice("%s detected: force use of acpi=rsdt\n", d->ident);
+               acpi_gbl_do_not_use_xsdt = TRUE;
+       } else {
+               pr_notice("Warning: DMI blacklist says broken, but acpi XSDT forced\n");
+       }
+       return 0;
+}
+
 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
 {
        if (!acpi_force) {
@@ -1444,6 +1455,19 @@ static struct dmi_system_id __initdata acpi_dmi_table[] = {
                     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
                     },
         },
+       /*
+        * Boxes that need ACPI XSDT use disabled due to corrupted tables
+        */
+       {
+        .callback = disable_acpi_xsdt,
+        .ident = "Advantech DAC-BJ01",
+        .matches = {
+                    DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
+                    DMI_MATCH(DMI_PRODUCT_NAME, "Bearlake CRB Board"),
+                    DMI_MATCH(DMI_BIOS_VERSION, "V1.12"),
+                    DMI_MATCH(DMI_BIOS_DATE, "02/01/2011"),
+                    },
+        },
        {}
 };