If ACPI HW reduced bit in FADT is set we should ignore any ACPI hardware
communications.
Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
---
arch/x86/lib/acpi_table.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c
index da6014fb41..3eb101105b 100644
--- a/arch/x86/lib/acpi_table.c
+++ b/arch/x86/lib/acpi_table.c
@@ -463,6 +463,10 @@ ulong write_acpi_tables(ulong start)
debug("ACPI: done\n");
+ /* Don't touch ACPI hardware on HW reduced platforms */
+ if (fadt->flags & ACPI_FADT_HW_REDUCED_ACPI)
+ return current;
+
/*
* Other than waiting for OSPM to request us to switch to ACPI mode,
* do it by ourselves, since SMI will not be triggered.
--
2.13.2
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