Hi, On Sun, May 25, 2014 at 11:10:30PM +0530, sundeep subbaraya wrote: > Hi Felipe, > > Please take a look at below about how this IP works: > > IN: > req.buf ---> DMA (transfers from ddr to IP buffer, raise DMA > done interrupt and set Buffer ready to transfer data to Host)---->Host > PC > buffer sent interrupt > > OUT: > Host PC--->buffer ready interrupt--->DMA (transfer from IP buffer > to DDR,DMA done interrupt, set Buffer ready to receive next data from > Host)-->req.buf > > I written logic to call completion in DMA done handler because it > works for both IN and OUT eps. But I see significant performance > degradation (by copying a file to mass storage gadget). DMA can handle > unaligned address too but it has ep max limit (say 512 for bulk). > Hence it is SW job to split packets and to drive DMA till req.length > completes. I feel polling for a while is faster than switching between > interrupt handler back and forth rapidly. Moreover, DMA may or may not > be present in IP based on user configuration at design time. > > I fixed all other comments expect this one if you do not agree for > polling then I may have to create threads and do this stuff. What do > you suggest? Can you resend your driver so we can review again everything you have fixed ? I guess you have no other way... polling it is. cheers -- balbi
Attachment:
signature.asc
Description: Digital signature
