[PATCH RESEND v2 1/2] ARM: ixp4xx: Make dma_set_coherent_mask common, correct implementation

[Arnd Bergmann]

On Thursday 20 March 2014, Krzysztof Hałasa wrote:
> Simon Kågström <simon.kagstrom at netinsight.net> writes:
> 
> > Thanks. However, Krzysztof thinks that this implementation is
> > incorrect. It certainly fixes my ixp4xx issues, but might not be good
> > for everyone.
> 
> It because you don't have PCI devices setting coherent mask to 32-bits
> (and that's what normal PCI devices do).
> 
> BTW PCI (and other) devices requesting 32-bit coherent allocs don't care
> if they're given 26-bit memory. 26 bits fit perfectly in 32 bits. It's
> the streaming mapping which is (may be) constrained by hardware.

Should I revert the patch then until we have a better fix?

	Arnd