linux-kernel - Re: [PATCH] dmaengine: dw: clear LLP_[SD]_EN bits in last descriptor of a chain

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Date:	Mon, 21 Dec 2015 21:34:12 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Mans Rullgard <mans@...sr.com>, Viresh Kumar <vireshk@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: dw: clear LLP_[SD]_EN bits in last
 descriptor of a chain

On Mon, 2015-12-21 at 19:10 +0000, Mans Rullgard wrote:
> The datasheet requires that the LLP_[SD]_EN bits be cleared whenever
> LLP.LOC is zero, i.e. in the last descriptor of a multi-block chain.
> Make the driver do this.

Acked-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> 
> Signed-off-by: Mans Rullgard <mans@...sr.com>
> ---
>  drivers/dma/dw/core.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
> index 7067b6ddc1db..ca7cafc82f6b 100644
> --- a/drivers/dma/dw/core.c
> +++ b/drivers/dma/dw/core.c
> @@ -751,6 +751,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan,
> dma_addr_t dest, dma_addr_t src,
>  		prev->lli.ctllo |= DWC_CTLL_INT_EN;
>  
>  	prev->lli.llp = 0;
> +	prev->lli.ctllo &= ~(DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
>  	first->txd.flags = flags;
>  	first->total_len = len;
>  
> @@ -912,6 +913,7 @@ slave_sg_fromdev_fill_desc:
>  		prev->lli.ctllo |= DWC_CTLL_INT_EN;
>  
>  	prev->lli.llp = 0;
> +	prev->lli.ctllo &= ~(DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
>  	first->total_len = total_len;
>  
>  	return &first->txd;

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy

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