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Date: Wed, 29 Apr 2015 09:44:47 -0500 From: Suravee Suthikulpanit <suravee.suthikulpanit@....com> To: Catalin Marinas <catalin.marinas@....com> CC: <al.stone@...aro.org>, <arnd@...db.de>, <linaro-acpi@...ts.linaro.org>, <rjw@...ysocki.net>, <will.deacon@....com>, <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>, <leo.duran@....com>, <hanjun.guo@...aro.org>, <msalter@...hat.com>, <grant.likely@...aro.org>, Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>, <linux-arm-kernel@...ts.infradead.org>, <lenb@...nel.org> Subject: Re: [PATCH 1/2] arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE_CCA On 04/29/2015 09:42 AM, Catalin Marinas wrote: > On Wed, Apr 29, 2015 at 09:31:03AM -0500, Suravee Suthikulpanit wrote: >> >> >> On 04/29/2015 09:04 AM, Catalin Marinas wrote: >>> 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? >> >> Not that I am aware, but I could be totally wrong. The reason I am adding >> this here for 32-bit ARM is because the ACPI spec mentioned this. >> >> If you think this is not necessary until we introduce ACPI for ARM32, it can >> be removed. > > I think it should be removed (as long as ACPI cannot be selected on > arm32). > Ok, I'll remove that in V2. Thanks, Suravee -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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