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x86: acpi: Don't touch hardware on HW reduced platforms
author
Andy Shevchenko
<andriy.shevchenko@linux.intel.com>
Fri, 21 Jul 2017 19:32:06 +0000
(22:32 +0300)
committer
Bin Meng
<bmeng.cn@gmail.com>
Sun, 30 Jul 2017 02:30:25 +0000
(10:30 +0800)
If ACPI HW reduced bit in FADT is set we should ignore any ACPI hardware
communications.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
arch/x86/lib/acpi_table.c
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diff --git
a/arch/x86/lib/acpi_table.c
b/arch/x86/lib/acpi_table.c
index
da6014f
..
3eb1011
100644
(file)
--- 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.