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x86: acpi: Don't touch hardware on HW reduced platforms

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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>
This commit is contained in:
Andy Shevchenko 2017-07-21 22:32:06 +03:00 committed by Bin Meng
parent ace7762b28
commit 382fabb297
1 changed files with 4 additions and 0 deletions
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4
arch/x86/lib/acpi_table.c
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@ -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.