linux-kernel - Re: [PATCH] dw_dmac: utilize slave

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Date:	Fri, 14 Sep 2012 08:30:07 +0530
From:	Vinod Koul <vinod.koul@...ux.intel.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Viresh Kumar <viresh.linux@...il.com>,
	linux-kernel@...r.kernel.org,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCH] dw_dmac: utilize slave_id to pass request line

On Mon, 2012-09-03 at 13:46 +0300, Andy Shevchenko wrote:
> There is slave_id field in the generic slave config structure that is dedicated
> for the uniq slave number. In our case we have the request lines wired to the
> certain hardware. Therefore the number of the request line is uniq and could be
> used as slave_id. It allows us in some cases to drop out the usage of the
> custom slave config structure.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Applied thanks
> ---
>  drivers/dma/dw_dmac.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
> index f0c9403..7a67673 100644
> --- a/drivers/dma/dw_dmac.c
> +++ b/drivers/dma/dw_dmac.c
> @@ -187,6 +187,11 @@ static void dwc_initialize(struct dw_dma_chan *dwc)
>  
>  		cfghi = dws->cfg_hi;
>  		cfglo |= dws->cfg_lo & ~DWC_CFGL_CH_PRIOR_MASK;
> +	} else {
> +		if (dwc->dma_sconfig.direction == DMA_MEM_TO_DEV)
> +			cfghi = DWC_CFGH_DST_PER(dwc->dma_sconfig.slave_id);
> +		else if (dwc->dma_sconfig.direction == DMA_DEV_TO_MEM)
> +			cfghi = DWC_CFGH_SRC_PER(dwc->dma_sconfig.slave_id);
>  	}
>  
>  	channel_writel(dwc, CFG_LO, cfglo);


-- 
~Vinod

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