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Date: Tue, 18 Sep 2012 12:43:49 +0530 From: viresh kumar <viresh.kumar@...aro.org> To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> Cc: Vinod Koul <vinod.koul@...el.com>, spear-devel@...t.st.com, linux-kernel@...r.kernel.org, Hein Tibosch <hein_tibosch@...oo.es> Subject: Re: [PATCH 6/7] dw_dmac: check if controller supports LLP On Mon, Sep 17, 2012 at 1:09 PM, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> 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 <andriy.shevchenko@...ux.intel.com> > --- > 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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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