[PATCH v2] arm64: Allow for different DMA and CPU bus offsets

Eric Anholt eric at anholt.net
Tue Jun 7 15:08:38 PDT 2016

Catalin Marinas <catalin.marinas at arm.com> writes:

> On Wed, May 18, 2016 at 02:27:41PM +0100, Catalin Marinas wrote:
>> 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 at 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).
> In case this patch goes in via the arm-soc tree (together with other
> RPi3 patches):
> Acked-by: Catalin Marinas <catalin.marinas at arm.com>

Thanks!  I've pulled this into my for-next branch.
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