linux-kernel - Re: [PATCH 1/2] arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE

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Message-ID: <20150429140445.GA18867@e104818-lin.cambridge.arm.com>
Date:	Wed, 29 Apr 2015 15:04:46 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:	rjw@...ysocki.net, lenb@...nel.org, will.deacon@....com,
	al.stone@...aro.org, arnd@...db.de, linaro-acpi@...ts.linaro.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	leo.duran@....com, hanjun.guo@...aro.org, msalter@...hat.com,
	grant.likely@...aro.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE_CCA

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@...hat.com>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....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
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