On 03/03/2016 03:41 AM, Aleksey Makarov wrote:

On 03/01/2016 08:25 PM, Peter Hurley wrote:

quoted

On 03/01/2016 09:02 AM, Aleksey Makarov wrote:

quoted

On 03/01/2016 05:52 PM, Peter Hurley wrote:

quoted

On 02/29/2016 04:42 AM, Aleksey Makarov wrote:

quoted

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.

quoted

quoted

quoted

quoted

Signed-off-by: Aleksey Makarov <redacted>
---
 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);
 	}
 }
 

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel at lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel