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ARM64: ACPI: enable ACPI_SPCR_TABLE

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SBBR mentions SPCR as a mandatory ACPI table.  So enable it for ARM64

Earlycon should be set up as early as possible.  ACPI boot tables are
mapped in arch/arm64/kernel/acpi.c:acpi_boot_table_init() that
is called from setup_arch() and that's where we parse SPCR.
So it has to be opted-in per-arch.

When ACPI_SPCR_TABLE is defined initialization of DT earlycon is
deferred until the DT/ACPI decision is done.  Initialize DT earlycon
if ACPI is disabled.

Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Tested-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aleksey Makarov 2016-09-27 23:54:14 +03:00 committed by Greg Kroah-Hartman
parent ad1696f6f0
commit 888125a712
2 changed files with 11 additions and 1 deletions
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1
arch/arm64/Kconfig
View File

@ -4,6 +4,7 @@ config ARM64
select ACPI_GENERIC_GSI if ACPI
select ACPI_REDUCED_HARDWARE_ONLY if ACPI
select ACPI_MCFG if ACPI
select ACPI_SPCR_TABLE if ACPI
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE

11
arch/arm64/kernel/acpi.c
View File

@ -24,6 +24,7 @@
#include <linux/memblock.h>
#include <linux/of_fdt.h>
#include <linux/smp.h>
#include <linux/serial_core.h>
#include <asm/cputype.h>
#include <asm/cpu_ops.h>
@ -206,7 +207,7 @@ void __init acpi_boot_table_init(void)
if (param_acpi_off ||
(!param_acpi_on && !param_acpi_force &&
of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
return;
goto done;
/*
* ACPI is disabled at this point. Enable it in order to parse
@ -226,6 +227,14 @@ void __init acpi_boot_table_init(void)
if (!param_acpi_force)
disable_acpi();
}
done:
if (acpi_disabled) {
if (earlycon_init_is_deferred)
early_init_dt_scan_chosen_stdout();
} else {
parse_spcr(earlycon_init_is_deferred);
}
}
#ifdef CONFIG_ACPI_APEI