Re: [PATCH v2 0/7] of: setup dma parameters using dma-ranges and dma-coherent

[Rob Herring]

On Tue, Apr 22, 2014 at 10:25 AM, Catalin Marinas
<catalin.marinas@xxxxxxx> wrote:
> On Tue, Apr 22, 2014 at 04:02:19PM +0100, Arnd Bergmann wrote:
>> On Saturday 19 April 2014, Thomas Petazzoni wrote:

[...]

>> I would hope we can find a way to avoid the platform notifiers for
>> mvebu as well and come up with a generic way to express this
>> 'semi-coherent' mode. I believe x-gene has a similar issue, and
>> I wouldn't be surprised if there are others like this.
>
> The solution is for the snooping unit to detect the DSB instruction
> (which is propagated outside the CPU) and wait for the completion of the
> coherency work (but we need more information from the hardware guys).

If the solution was fixing broken h/w, we'd all be retired (or h/w
designers). :)

Rob
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