linux-kernel - Re: [PATCH v7 07/17] ARM64 / ACPI: Disable ACPI if FADT revision is less than 5.1

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Date:	Thu, 15 Jan 2015 12:47:03 -0600
From:	Mark Langsdorf <mlangsdo@...hat.com>
To:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Will Deacon <will.deacon@....com>
CC:	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Jon Masters <jcm@...hat.com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles.Garcia-Tobin@....com, phoenix.liyi@...wei.com,
	Timur Tabi <timur@...eaurora.org>,
	suravee.suthikulpanit@....com, wangyijing@...wei.com,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org
Subject: Re: [PATCH v7 07/17] ARM64 / ACPI: Disable ACPI if FADT revision
 is less than 5.1

On 01/14/2015 09:04 AM, Hanjun Guo wrote:
> FADT Major.Minor version was introduced in ACPI 5.1, it is the same
> as ACPI version.
>
> In ACPI 5.1, some major gaps are fixed for ARM, such as updates in
> MADT table for GIC and SMP init, without those updates, we can not
> get the MPIDR for SMP init, and GICv2/3 related init information, so
> we can't boot arm64 ACPI properly with table versions predating 5.1.
>
> If firmware provides ACPI tables with ACPI version less than 5.1,
> OS will be messed up with those information and have no way to init
> smp and GIC, so disable ACPI if we get an FADT table with version
> less that 5.1.
>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> Tested-by: Yijing Wang <wangyijing@...wei.com>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
Tested-by: Mark Langsdorf <mlangsdo@...hat.com>
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