Re: [PATCH 1/2] arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE_CCA

Catalin Marinas
2015-04-29T14:04:57Z

On Wed, Apr 29, 2015 at 08:44:08AM -0500, Suravee Suthikulpanit wrote:
> From ACPIv6 (http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf),
> section 6.2.17 _CCA states that ARM platforms require ACPI _CCA object to be
> specified for DMA-cabpable devices. This patch introduces ACPI_MUST_HAVE_CCA
> in arm and arm64 Kconfig to specify such requirement.
>
> Note that when _CCA is required, if it is missing in the DSDT. ACPI driver
> will default to setting up devices as non-coherent.
>
> Signed-off-by: Mark Salter <msalter@redhat.com>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
> ---
> arch/arm/Kconfig | 1 +
> arch/arm64/Kconfig | 1 +
> drivers/acpi/Kconfig | 3 +++
> 3 files changed, 5 insertions(+)
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 45df48b..2a0d036 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1,6 +1,7 @@
> config ARM
> bool
> default y
> + select ACPI_MUST_HAVE_CCA if ACPI
> select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
> select ARCH_HAS_ELF_RANDOMIZE
> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST

Any plans for ACPI on 32-bit ARM?

--
Catalin