linux-kernel - Re: [Linaro-acpi] [PATCH v7 00/17] Introduce ACPI for ARM64 based on ACPI 5.1

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Date:	Fri, 16 Jan 2015 16:53:33 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linaro-acpi@...ts.linaro.org
Cc:	Will Deacon <will.deacon@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Yijing Wang <wangyijing@...wei.com>,
	Rob Herring <robh@...nel.org>,
	Timur Tabi <timur@...eaurora.org>,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>,
	Tom Lendacky <thomas.lendacky@....com>,
	"phoenix.liyi@...wei.com" <phoenix.liyi@...wei.com>,
	Robert Richter <rric@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"jcm@...hat.com" <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>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Olof Johansson <olof@...om.net>
Subject: Re: [Linaro-acpi] [PATCH v7 00/17] Introduce ACPI for ARM64 based on ACPI 5.1

On Friday 16 January 2015 15:49:13 Will Deacon wrote:
> 
> The on-board ethernet on Seattle requires the driver to program its AXI
> attributes, so configuring it to be a coherent master actually means
> "program the same cacheable AXI settings as you have on the CPU". That
> sounds like Linux should be doing it to me, but even if the firmware takes
> a guess at "normal cacheable WBRWA", it's not clear to me whether that
> register persists across things like adapter reset.
> 
> Tom?
> 
> There's also the situation where the firmware hasn't initialised the
> register and Linux realises this during probe. What should it do then?

In case of a 10gbit ethernet adapter, there really should be no question
regarding whether to set it coherent or not. Can't Linux just always
set this AXI attribute in the driver?

	Arnd
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