Arnd Bergmann wrote: > On Wednesday 05 December 2007, Scott Wood wrote: >>> You can argue that the QS is really a DMA device, but in that >>> case you should convert the driver to use the DMA mapping >>> interfaces correctly, which I would consider overkill. >> Why is it overkill? >> > > Well, if the QE can never be used with an IOMMU anyway,
I'm unconvinced that that will always be the case. > The DMA mapping API is meant for the cases where physical and dma > addresses can be different in the first place. It's also used for noncoherent DMA; while it's unlikely Freescale will come out with a QE 8xx chip any time soon, there could be hardware bugs or performance considerations that make it desireable to treat it as non-coherent. -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
