On Wed, Jan 24, 2018 at 05:45:00PM +0000, Hyun Kwon wrote:
> > > > > +static int xilinx_dpdma_config(struct dma_chan *dchan,
> > > > > + struct dma_slave_config *config)
> > > > > +{
> > > > > + if (config->direction != DMA_MEM_TO_DEV)
> > > > > + return -EINVAL;
> > > >
> > > > ?? Why are the config values not used, how else do you configure the
> > > > channel?
> > > >
> > >
> > > There's not much configuration to be done. Channels are pretty much
> > identical
> > > with fixed configurations.
> >
> > hmmm, you do support DMA_SLAVE right?
> >
>
> Yes, and it's single direction, DMA_MEM_TO_DEV.
Okay how do you find the DMA data width and the burst to apply when you DMA
to device? Are these not programmable?
I think you need to go back and check that part. Moreover a client may send
you parameters and program the Device FIFO, you not honoring those will
result in bad data received on Device, am sure you don't want that
--
~Vinod
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