linux-kernel - Re: [PATCH v3 5/8] dmaengine: rcar-dmac: group slave configuration

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Message-ID: <2394364.dCGqmLNa8V@avalon>
Date:	Thu, 11 Feb 2016 02:14:35 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Niklas Söderlund 
	<niklas.soderlund+renesas@...natech.se>
Cc:	linux-renesas-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org, iommu@...ts.linux-foundation.org,
	robin.murphy@....com, vinod.koul@...el.com,
	geert+renesas@...der.be, linus.walleij@...aro.org,
	dan.j.williams@...el.com, arnd@...db.de, linux-arch@...r.kernel.org
Subject: Re: [PATCH v3 5/8] dmaengine: rcar-dmac: group slave configuration

Hi Niklas,

Thank you for the patch.

On Wednesday 10 February 2016 01:57:55 Niklas Söderlund wrote:
> Group slave address and transfer size in own structs for source and
> destination. This is in preparation for hooking up the dma-mapping API
> to the slave addresses.
> 
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/dma/sh/rcar-dmac.c | 37 +++++++++++++++++++++----------------
>  1 file changed, 21 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
> index 7820d07..743873c 100644
> --- a/drivers/dma/sh/rcar-dmac.c
> +++ b/drivers/dma/sh/rcar-dmac.c
> @@ -118,14 +118,21 @@ struct rcar_dmac_desc_page {
>  	sizeof(struct rcar_dmac_xfer_chunk))
> 
>  /*
> + * @slave_addr: slave memory address
> + * @xfer_size: size (in bytes) of hardware transfers
> + */
> +struct rcar_dmac_chan_slave {
> +	dma_addr_t slave_addr;
> +	unsigned int xfer_size;
> +};
> +
> +/*
>   * struct rcar_dmac_chan - R-Car Gen2 DMA Controller Channel
>   * @chan: base DMA channel object
>   * @iomem: channel I/O memory base
>   * @index: index of this channel in the controller
> - * @src_xfer_size: size (in bytes) of hardware transfers on the source side
> - * @dst_xfer_size: size (in bytes) of hardware transfers on the
> destination side - * @src_slave_addr: slave source memory address
> - * @dst_slave_addr: slave destination memory address
> + * @src: slave memory address and size on the source side
> + * @dst: slave memory address and size on the destination side
>   * @mid_rid: hardware MID/RID for the DMA client using this channel
>   * @lock: protects the channel CHCR register and the desc members
>   * @desc.free: list of free descriptors
> @@ -142,10 +149,8 @@ struct rcar_dmac_chan {
>  	void __iomem *iomem;
>  	unsigned int index;
> 
> -	unsigned int src_xfer_size;
> -	unsigned int dst_xfer_size;
> -	dma_addr_t src_slave_addr;
> -	dma_addr_t dst_slave_addr;
> +	struct rcar_dmac_chan_slave src;
> +	struct rcar_dmac_chan_slave dst;
>  	int mid_rid;
> 
>  	spinlock_t lock;
> @@ -793,13 +798,13 @@ static void rcar_dmac_chan_configure_desc(struct
> rcar_dmac_chan *chan, case DMA_DEV_TO_MEM:
>  		chcr = RCAR_DMACHCR_DM_INC | RCAR_DMACHCR_SM_FIXED
> 
>  		     | RCAR_DMACHCR_RS_DMARS;
> 
> -		xfer_size = chan->src_xfer_size;
> +		xfer_size = chan->src.xfer_size;
>  		break;
> 
>  	case DMA_MEM_TO_DEV:
>  		chcr = RCAR_DMACHCR_DM_FIXED | RCAR_DMACHCR_SM_INC
> 
>  		     | RCAR_DMACHCR_RS_DMARS;
> 
> -		xfer_size = chan->dst_xfer_size;
> +		xfer_size = chan->dst.xfer_size;
>  		break;
> 
>  	case DMA_MEM_TO_MEM:
> @@ -1038,7 +1043,7 @@ rcar_dmac_prep_slave_sg(struct dma_chan *chan, struct
> scatterlist *sgl, }
> 
>  	dev_addr = dir == DMA_DEV_TO_MEM
> -		 ? rchan->src_slave_addr : rchan->dst_slave_addr;
> +		 ? rchan->src.slave_addr : rchan->dst.slave_addr;
>  	return rcar_dmac_chan_prep_sg(rchan, sgl, sg_len, dev_addr,
>  				      dir, flags, false);
>  }
> @@ -1093,7 +1098,7 @@ rcar_dmac_prep_dma_cyclic(struct dma_chan *chan,
> dma_addr_t buf_addr, }
> 
>  	dev_addr = dir == DMA_DEV_TO_MEM
> -		 ? rchan->src_slave_addr : rchan->dst_slave_addr;
> +		 ? rchan->src.slave_addr : rchan->dst.slave_addr;
>  	desc = rcar_dmac_chan_prep_sg(rchan, sgl, sg_len, dev_addr,
>  				      dir, flags, true);
> 
> @@ -1110,10 +1115,10 @@ static int rcar_dmac_device_config(struct dma_chan
> *chan, * We could lock this, but you shouldn't be configuring the
>  	 * channel, while using it...
>  	 */
> -	rchan->src_slave_addr = cfg->src_addr;
> -	rchan->dst_slave_addr = cfg->dst_addr;
> -	rchan->src_xfer_size = cfg->src_addr_width;
> -	rchan->dst_xfer_size = cfg->dst_addr_width;
> +	rchan->src.slave_addr = cfg->src_addr;
> +	rchan->dst.slave_addr = cfg->dst_addr;
> +	rchan->src.xfer_size = cfg->src_addr_width;
> +	rchan->dst.xfer_size = cfg->dst_addr_width;
> 
>  	return 0;
>  }

-- 
Regards,

Laurent Pinchart