linux-kernel - Re: [PATCH] arm/arm64: DT: Fix GICv2 CPU interface size

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Date:	Wed, 25 Jun 2014 15:31:34 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH] arm/arm64: DT: Fix GICv2 CPU interface size

On Wed, Jun 25, 2014 at 11:37:54AM +0100, Marc Zyngier wrote:
> All the Cortex-{A7,A15} implementations are using a GICv2. Same for
> the current arm64 platforms.
> 
> Turns out that most of these platforms have described their GIC CPU
> interface size as being 4kB. while it is actually 8kB (the GICC_DIR
> register lives at offset 0x1000).
> 
> This was found when converting the GIC driver to use EOImode==1 on
> GICv2-based systems. It uses the GICC_DIR register, and the result
> is a very early firework...
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

Just tested this on an Allwinner A31.

Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
Tested-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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