On 03/03/2016 03:41 AM, Aleksey Makarov wrote:
>
>
> On 03/01/2016 08:25 PM, Peter Hurley wrote:
>> On 03/01/2016 09:02 AM, Aleksey Makarov wrote:
>>>
>>>
>>> On 03/01/2016 05:52 PM, Peter Hurley wrote:
>>>> On 02/29/2016 04:42 AM, Aleksey Makarov wrote:
>>>>> SBBR mentions DBG2 as a mandatory ACPI table.
>>>>> So enable it for ARM64
>>>>
>>>> Why does this have to be opted-in per-arch?
>>>
>>> DBG2 can specify earlycons. They should start as soon as possible.
>>> On ARM64 it is just after boot tables become available (in arch_init()).
>>> So it has to be per-arch unless we decide not to start earlycons on
>>> DBG2 ports.
>>
>> OF does all that already but the earlycon opt-in is not per-arch.
>
> In the last next-XXXX kernel support for OF earlycon depends on
> CONFIG_OF_EARLY_FLATTREE which *is* per-arch.
That's true.
(of_setup_earlycon() was really always CONFIG_OF_EARLY_FLATTREE because
its lone caller was CONFIG_OF_EARLY_FLATTREE).
> Probably we need the same kind of configuration option here,
> something like CONFIG_ACPI_BOOT_TABLES instead of ACPI_DBG2_TABLE.
I'll let acpi maintainers sort that.
>>>>> Signed-off-by: Aleksey Makarov <aleksey.makarov@xxxxxxxxxx>
>>>>> ---
>>>>> arch/arm64/Kconfig | 1 +
>>>>> arch/arm64/kernel/acpi.c | 2 ++
>>>>> 2 files changed, 3 insertions(+)
>>>>>
>>>>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>>>>> index 9dc5209..0b614d4 100644
>>>>> --- a/arch/arm64/Kconfig
>>>>> +++ b/arch/arm64/Kconfig
>>>>> @@ -3,6 +3,7 @@ config ARM64
>>>>> select ACPI_CCA_REQUIRED if ACPI
>>>>> select ACPI_GENERIC_GSI if ACPI
>>>>> select ACPI_REDUCED_HARDWARE_ONLY if ACPI
>>>>> + select ACPI_DBG2_TABLE if ACPI
>>>>> select ARCH_HAS_DEVMEM_IS_ALLOWED
>>>>> select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
>>>>> select ARCH_HAS_ELF_RANDOMIZE
>>>>> diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
>>>>> index d1ce8e2..3370046 100644
>>>>> --- a/arch/arm64/kernel/acpi.c
>>>>> +++ b/arch/arm64/kernel/acpi.c
>>>>> @@ -208,6 +208,8 @@ void __init acpi_boot_table_init(void)
>>>>> pr_err("Failed to init ACPI tables\n");
>>>>> if (!param_acpi_force)
>>>>> disable_acpi();
>>>>> + } else {
>>>>> + acpi_probe_device_table(dbg2);
>>>>> }
>>>>> }
>>>>>
>>>>>
>>>>
>>
>>
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