From mboxrd@z Thu Jan  1 00:00:00 1970
From: catalin.marinas@arm.com (Catalin Marinas)
Date: Wed, 18 May 2016 14:27:41 +0100
Subject: [PATCH v2] arm64: Allow for different DMA and CPU bus offsets
In-Reply-To: <1463576010-115428-1-git-send-email-agraf@suse.de>
References: <1463576010-115428-1-git-send-email-agraf@suse.de>
Message-ID: <20160518132741.GE22378@e104818-lin.cambridge.arm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, May 18, 2016 at 02:53:30PM +0200, Alexander Graf wrote:
> On arm64, all SoCs we supported so far either have an IOMMU or have bus
> addresses equal to CPU addresses.
> 
> However, with the Raspberry Pi 3 coming up, this is no longer true. To
> allow DMA to work with an AArch64 kernel on those devices, let's allow
> devices to have DMA offsets again.
> 
> Signed-off-by: Alexander Graf <agraf@suse.de>

We were aware about this issue but we've been waiting for an actual use
case. I'll queue this for 4.8 (given that RPi3 is not supported by the
arm64 kernel, I don't see the rush to merge it earlier).

Thanks.

-- 
Catalin