On Thu, Sep 27, 2012 at 03:11:08PM +0530, Vinod Koul wrote: > On Fri, 2012-09-21 at 19:47 +0100, Russell King - ARM Linux wrote: > > On Fri, Sep 21, 2012 at 10:45:29PM +0530, S, Venkatraman wrote: > > > On Thu, Sep 20, 2012 at 8:13 PM, Matt Porter <mporter@xxxxxx> wrote: > > > > The EDMA DMAC has a hardware limitation that prevents supporting > > > > scatter gather lists with any number of segments. Since the EDMA > > > > DMA Engine driver sets the maximum segments to 16, we do the > > > > same. > > > > > > > > Note: this can be removed once the DMA Engine API supports an > > > > API to query the DMAC's segment limitations. > > > > > > > > > > I wouldn't want to bind the properties of EDMA to omap_hsmmc as this patch > > > suggests. Why don't we have a max_segs property, which when explicitly specified > > > in DT, will override the default ? > > > > Why not have a generic way that DMA engine can export these kinds of > > properties? > We discussed this at KS. I was of opinion that DMA engine should export > controller and channel capabilities as part of the channel it returns. > > Some folks had an opinion that they already know how to use controller > so may not be very helpful, but if it is going to help (which I think), > i have a patch for this :) Anything you can show at this point? ;) I'd be happy to drop the half-hack for a real API. If not, I'm going to carry that to v2 atm. -Matt -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
