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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2017-07-21 22:32:06 +0300 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2017-07-30 10:30:25 +0800 |
| commit | 382fabb2974a153de73949e4bbd033c3235dac76 (patch) | |
| tree | a83883539cefe39da895a42b8b8e7672705afea7 /arch/x86/lib | |
| parent | ace7762b28545e0d2e122d07e81cd4c094fbb298 (diff) | |
| download | u-boot-382fabb2974a153de73949e4bbd033c3235dac76.tar.gz u-boot-382fabb2974a153de73949e4bbd033c3235dac76.tar.xz u-boot-382fabb2974a153de73949e4bbd033c3235dac76.zip | |
x86: acpi: Don't touch hardware on HW reduced platforms
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>
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/acpi_table.c | 4 |
1 files changed, 4 insertions, 0 deletions
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. |