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SubjectRe: dma_alloc_coherent() on PPC32: physical addresses above 2G possible?
On Sun, 20 Jul 2008 21:25:51 +0200
Stefan Richter <stefanr@s5r6.in-berlin.de> wrote:

> Arjan van de Ven wrote:
> > On Sun, 20 Jul 2008 20:36:23 +0200
> > Stefan Richter <stefanr@s5r6.in-berlin.de> wrote:
> >
> >> PS: I don't want to set the DMA mask of this device to
> >> DMA_31BIT_MASK because that would be detrimental to other functions
> >> of the device. It's a TI TSB43AB22A FireWire controller.
> >
> > Hi,
> >
> > just want to mention that you can set the coherent mask separately
> > from the generic mask... is that sufficient for your load?
> > (you can even set it just for this allocation..)
>
> Hmm. Would that be done this way?
> During probe:
>
> if (chip_is_tsb43ab22a) {
> if (dma_supported(dev, DMA_31BIT_MASK))
> chip->needs_dma_mask_workaround = 1;
> else
> chip->needs_some_other_workaround = 1;
> }

btw it might be nicer to make this

chip->something_special_mask = DMA_31BIT_MASK;

then you can just use the mask from this struct rather than another
check


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