linux-kernel - Re: [resend][PATCH 11/16] dw_dmac: backlink to dw_dma in dw_dma

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Date:	Wed, 9 Jan 2013 06:24:43 -0800
From:	Vinod Koul <vinod.koul@...el.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.jf.intel.com>
Cc:	linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	spear-devel <spear-devel@...t.st.com>
Subject: Re: [resend][PATCH 11/16] dw_dmac: backlink to dw_dma in
 dw_dma_chan is superfluous

On Wed, Jan 09, 2013 at 10:17:10AM +0200, Andy Shevchenko wrote:
> The same information could be exctracted from the struct dma_chan.
typo...                         ^^^^^^^^^^
> The patch introduces helper function dwc_get_data_width() as well.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/dma/dw_dmac.c      |   27 ++++++++++++++++++++-------
>  drivers/dma/dw_dmac_regs.h |    3 ---
>  2 files changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
> index ff9d68b..39a6506 100644
> --- a/drivers/dma/dw_dmac.c
> +++ b/drivers/dma/dw_dmac.c
> @@ -73,6 +73,22 @@ static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave)
>   */
>  #define NR_DESCS_PER_CHANNEL	64
>  
> +#define SRC_MASTER	0
> +#define DST_MASTER	1
> +
> +static inline unsigned int dwc_get_data_width(struct dma_chan *chan, int master)
> +{
> +	struct dw_dma *dw = to_dw_dma(chan->device);
> +	struct dw_dma_slave *dws = chan->private;
> +
> +	if (master == SRC_MASTER)
> +		return dw->data_width[dwc_get_sms(dws)];
> +	else if (master == DST_MASTER)
> +		return dw->data_width[dwc_get_dms(dws)];
> +
> +	return 0;
> +}
> +
>  /*----------------------------------------------------------------------*/
>  
>  /*
> @@ -703,7 +719,6 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
>  		size_t len, unsigned long flags)
>  {
>  	struct dw_dma_chan	*dwc = to_dw_dma_chan(chan);
> -	struct dw_dma_slave	*dws = chan->private;
>  	struct dw_desc		*desc;
>  	struct dw_desc		*first;
>  	struct dw_desc		*prev;
> @@ -726,8 +741,8 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
>  
>  	dwc->direction = DMA_MEM_TO_MEM;
>  
> -	data_width = min_t(unsigned int, dwc->dw->data_width[dwc_get_sms(dws)],
> -					 dwc->dw->data_width[dwc_get_dms(dws)]);
> +	data_width = min_t(unsigned int, dwc_get_data_width(chan, SRC_MASTER),
> +			   dwc_get_data_width(chan, DST_MASTER));
>  
>  	src_width = dst_width = min_t(unsigned int, data_width,
>  				      dwc_fast_fls(src | dest | len));
> @@ -792,7 +807,6 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
>  		unsigned long flags, void *context)
>  {
>  	struct dw_dma_chan	*dwc = to_dw_dma_chan(chan);
> -	struct dw_dma_slave	*dws = chan->private;
>  	struct dma_slave_config	*sconfig = &dwc->dma_sconfig;
>  	struct dw_desc		*prev;
>  	struct dw_desc		*first;
> @@ -826,7 +840,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
>  		ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
>  			DWC_CTLL_FC(DW_DMA_FC_D_M2P);
>  
> -		data_width = dwc->dw->data_width[dwc_get_sms(dws)];
> +		data_width = dwc_get_data_width(chan, SRC_MASTER);
>  
>  		for_each_sg(sgl, sg, sg_len, i) {
>  			struct dw_desc	*desc;
> @@ -889,7 +903,7 @@ slave_sg_todev_fill_desc:
>  		ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
>  			DWC_CTLL_FC(DW_DMA_FC_D_P2M);
>  
> -		data_width = dwc->dw->data_width[dwc_get_dms(dws)];
> +		data_width = dwc_get_data_width(chan, DST_MASTER);
>  
>  		for_each_sg(sgl, sg, sg_len, i) {
>  			struct dw_desc	*desc;
> @@ -1720,7 +1734,6 @@ static int dw_probe(struct platform_device *pdev)
>  
>  		channel_clear_bit(dw, CH_EN, dwc->mask);
>  
> -		dwc->dw = dw;
>  		dwc->direction = DMA_TRANS_NONE;
>  
>  		/* hardware configuration */
> diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h
> index f9532c2..577f2dd 100644
> --- a/drivers/dma/dw_dmac_regs.h
> +++ b/drivers/dma/dw_dmac_regs.h
> @@ -214,9 +214,6 @@ struct dw_dma_chan {
>  
>  	/* configuration passed via DMA_SLAVE_CONFIG */
>  	struct dma_slave_config dma_sconfig;
> -
> -	/* backlink to dw_dma */
> -	struct dw_dma		*dw;
>  };
>  
>  static inline struct dw_dma_chan_regs __iomem *
> -- 
> 1.7.10.4
> 
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