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ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64 

ACPI reduced hardware mode is disabled by default, but ARM64
can only run properly in ACPI hardware reduced mode, so select
ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64.

If the firmware is not using hardware reduced ACPI mode, we
will disable ACPI to avoid nightmare such as accessing some
registers which are not available on ARM64.

CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Will Deacon <will.deacon@arm.com>
Reviewed-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Yijing Wang <wangyijing@huawei.com>
Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
Tested-by: Jon Masters <jcm@redhat.com>
Tested-by: Timur Tabi <timur@codeaurora.org>
Tested-by: Robert Richter <rrichter@cavium.com>
Acked-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Al Stone 2015-03-24 14:02:51 +00:00 committed by Will Deacon
parent b09ca1ecf6
commit 6933de0ca0
2 changed files with 8 additions and 1 deletions
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1
arch/arm64/Kconfig
View File

@ -1,5 +1,6 @@
config ARM64
def_bool y
select ACPI_REDUCED_HARDWARE_ONLY if ACPI
select ARCH_BINFMT_ELF_RANDOMIZE_PIE
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_GCOV_PROFILE_ALL

8
arch/arm64/kernel/acpi.c
View File

@ -303,6 +303,11 @@ static int __init acpi_parse_fadt(struct acpi_table_header *table)
*/
if (table->revision > 5 ||
(table->revision == 5 && fadt->minor_revision >= 1)) {
if (!acpi_gbl_reduced_hardware) {
pr_err("Not hardware reduced ACPI mode, will not be supported\n");
goto disable_acpi;
}
/*
* ACPI 5.1 only has two explicit methods to boot up SMP,
* PSCI and Parking protocol, but the Parking protocol is
@ -319,8 +324,9 @@ static int __init acpi_parse_fadt(struct acpi_table_header *table)
pr_warn("Unsupported FADT revision %d.%d, should be 5.1+, will disable ACPI\n",
table->revision, fadt->minor_revision);
disable_acpi();
disable_acpi:
disable_acpi();
return -EINVAL;
}