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Date: Mon, 9 May 2011 12:40:04 +0900 From: Tomoya MORINAGA <tomoya-linux@....okisemi.com> To: Dan Williams <dan.j.williams@...el.com>, Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org Cc: qi.wang@...el.com, yong.y.wang@...el.com, joel.clark@...el.com, kok.howg.ewe@...el.com, toshiharu-linux@....okisemi.com, Tomoya MORINAGA <tomoya-linux@....okisemi.com> Subject: [PATCH V2 3/5] pch_dma: Fix DMA setting issue Currently, Direct-Start mode(*) is enabled. Our IOH's devices must not use this mode. This causes unexpected behavior. This patch deletes Direct-Start setting. (*) This mode is used in order for CPU to generate the DMA request. Signed-off-by: Tomoya MORINAGA <tomoya-linux@....okisemi.com> --- drivers/dma/pch_dma.c | 7 ------- 1 files changed, 0 insertions(+), 7 deletions(-) diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c index f73686e..0ecf227 100644 --- a/drivers/dma/pch_dma.c +++ b/drivers/dma/pch_dma.c @@ -254,9 +254,6 @@ static bool pdc_is_idle(struct pch_dma_chan *pd_chan) static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc) { - struct pch_dma *pd = to_pd(pd_chan->chan.device); - u32 val; - if (!pdc_is_idle(pd_chan)) { dev_err(chan2dev(&pd_chan->chan), "BUG: Attempt to start non-idle channel\n"); @@ -282,10 +279,6 @@ static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc) channel_writel(pd_chan, NEXT, desc->txd.phys); pdc_set_mode(&pd_chan->chan, DMA_CTL0_SG); } - - val = dma_readl(pd, CTL2); - val |= 1 << (DMA_CTL2_START_SHIFT_BITS + pd_chan->chan.chan_id); - dma_writel(pd, CTL2, val); } static void pdc_chain_complete(struct pch_dma_chan *pd_chan, -- 1.7.4 -- 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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