Re: [PATCH] MIPS: DMA: fix coherent alloc in non-coherent systems

[Leonid Yegoshin]

On 10/30/2014 03:07 AM, James Hogan wrote:
> Hi Leonid,
>
> On 30/10/14 01:48, Leonid Yegoshin wrote:
> > A default dma_alloc_coherent() fails to alloc a coherent memory on non-coherent
> > systems in case of device->coherent_dma_mask covering the whole memory space.
> >
> > In case of non-coherent systems the coherent memory on MIPS is restricted by
> > size of un-cachable segment and should be located in ZONE_DMA.
> Has this pretty much always been broken?
Yes, but it can be seen on MIPS32 EVA-based CPUs.
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