linux-kernel - Re: [Linaro-acpi] [PATCH v7 04/17] ARM64 / ACPI: Introduce early_param for "acpi" and pass acpi=force to enable ACPI

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Message-ID: <CAOZdJXU2bFR1T4ZnGavvnrUXAp5e=vNt9g6WKX46H8qs1wz-TQ@mail.gmail.com>
Date:	Wed, 28 Jan 2015 11:58:54 -0600
From:	Timur Tabi <timur@...eaurora.org>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	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>,
	linaro-acpi@...ts.linaro.org, wangyijing@...wei.com,
	Rob Herring <robh@...nel.org>,
	Timur Tabi <timur@...eaurora.org>, linux-acpi@...r.kernel.org,
	phoenix.liyi@...wei.com, Robert Richter <rric@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Jon Masters <jcm@...hat.com>, Mark Brown <broonie@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [Linaro-acpi] [PATCH v7 04/17] ARM64 / ACPI: Introduce
 early_param for "acpi" and pass acpi=force to enable ACPI

On Wed, Jan 14, 2015 at 9:04 AM, Hanjun Guo <hanjun.guo@...aro.org> wrote:
> From: Al Stone <al.stone@...aro.org>
>
> Introduce one early parameters "off" and "force" for "acpi", acpi=off
> will be the default behavior for ARM64, so introduce acpi=force to
> enable ACPI on ARM64.
>
> Disable ACPI before early parameters parsed, and enable it to pass
> "acpi=force" if people want use ACPI on ARM64. This ensures DT be
> the prefer one if ACPI table and DT both are provided at this moment.

What is the reason to assume that DT is preferred over ACPI?  I would
have thought that if ACPI is present, then it means we're on an ARM64
server platform, and therefore it should be used.  It seems silly to
require acpi=force on every ARM64 server platform.

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Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
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