From: robherring2@gmail.com (Rob Herring)
To: linux-arm-kernel@lists.infradead.org
Subject: Cortex A9 with ACP needing mixed coherency model
Date: Fri, 24 Aug 2012 08:05:50 -0500 [thread overview]
Message-ID: <50377C2E.4080408@gmail.com> (raw)
In-Reply-To: <20120824085440.GC5400@mudshark.cambridge.arm.com>
On 08/24/2012 03:54 AM, Will Deacon wrote:
> On Fri, Aug 24, 2012 at 01:58:50AM +0100, John Linn wrote:
>> It doesn't look like there's any good way to have a mixed coherency
>> model to support using the ACP where there is coherency and using
>> other ports where there is not coherency.
>> ARM Linux kernel can support arch_is_coherent(), which means all DMA
>> I/O is coherent. We have multiple DMA engines and they can go to thru
>> coherent or non-coherent ports.
>>
>> Am I missing something, or has someone figured out a way to deal with this?
>
> Didn't Rob have a crack at fixing this with his recent DMA series?
>
> http://lists.infradead.org/pipermail/linux-arm-kernel/2012-August/113929.html
>
> It's a really nice set of patches, so take a look.
It's queued up in Marek's dma-mapping tree for 3.7.
Rob
prev parent reply other threads:[~2012-08-24 13:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-24 0:58 Cortex A9 with ACP needing mixed coherency model John Linn
2012-08-24 8:54 ` Will Deacon
2012-08-24 13:05 ` Rob Herring [this message]
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