On Mon, Sep 17, 2012 at 1:09 PM, Andy Shevchenko <[email protected]> wrote: > Some controllers have the reduced functionality where the LLP multi block > transfers are not supported. This patch introduces a check and refuses to deal > with such devices. > > Signed-off-by: Andy Shevchenko <[email protected]> > --- > drivers/dma/dw_dmac.c | 35 ++++++++++++++++++++++++++++++++++- > drivers/dma/dw_dmac_regs.h | 4 ++++ > 2 files changed, 38 insertions(+), 1 deletion(-) > > diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c > index fdb7d5a..00958ad 100644 > --- a/drivers/dma/dw_dmac.c > +++ b/drivers/dma/dw_dmac.c > @@ -647,6 +647,12 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t > dest, dma_addr_t src, > unsigned int dst_width; > u32 ctllo; > > + if (dwc->nollp) { > + dev_dbg(chan2dev(&dwc->chan), > + "channel doesn't support LLP transfers\n"); > + return NULL; > + }
But this could have been a single block request. Isn't it? -- viresh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
