On Tue, Nov 29, 2011 at 05:10:04PM +0530, Rajaram R wrote: > On Tue, Nov 29, 2011 at 2:24 AM, Felipe Balbi <balbi@xxxxxx> wrote: > > On Mon, Nov 28, 2011 at 11:36:38PM +0530, Rajaram R wrote: > >> Hi Felipe > >> > >> On Mon, Nov 28, 2011 at 8:02 PM, Felipe Balbi <balbi@xxxxxx> wrote: > >> > > >> > Hi all, > >> > > >> > here's v2 of the scatterlist support on gadget framework. > >> > >> Do you see this design change useful in only in dwc or useful in any > >> other controller ? > > > > It depends on the DMA engine. If you can use scatter-gather on your DMA > > engine, then it does make sense. > > I believe this change will enhance the performance of gadget driver? it might. It will prevent us from doing memcpy of the scattered data to a physically contiguous buffer at least. > Any class level change required for this ? of course, gadget driver needs to support scatter-gather and needs to initialize the new fields of the usb_request structure. > Do you think such changes be useful for musb as well? musb's internal DMA engine doesn't support scatter-gather, sorry. Maybe the DaVinci versions using CPPI DMA, I don't know whether CPPI supports scatter-gather. -- balbi
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