linux-kernel - Re: [PATCH 2/2] rcar-hpbdma: add parameter to set

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Date:	Thu, 26 Sep 2013 11:14:46 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	vinod.koul@...el.com, dan.j.williams@...el.com,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org
Subject: Re: [PATCH 2/2] rcar-hpbdma: add parameter to set_slave() method

On Thu, Sep 26, 2013 at 02:31:37AM +0400, Sergei Shtylyov wrote:
> Commit 4981c4dc194efb18f0e9a02f1b43e926f2f0d2bb (DMA: shdma: switch DT mode to
> use configuration data from a match table) added a new parameter to set_slave()
> method but unfortunately got merged later than commit c4f6c41ba790bbbfcebb4c47a
> (dma: add driver for R-Car HPB-DMAC), so that the HPB-DMAC driver retained the
> old prototype which caused this warning:
> 
> drivers/dma/sh/rcar-hpbdma.c:485: warning: initialization from incompatible
> pointer type
> 
> The newly added parameter  is used to override DMA slave address from 'struct
> hpb_dmae_slave_config', so we have to add the 'slave_addr' field to 'struct
> hpb_dmae_chan', conditionally assign it in set_slave() method, and return in
> slave_addr() method.
> 
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

Tested-by: Simon Horman <horms+renesas@...ge.net.au>

> ---
> The patch is against 'fixes-3.12' branch of Vinod Koul's 'slave-dma.git' repo.
>  
>  drivers/dma/sh/rcar-hpbdma.c |    7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> Index: slave-dma/drivers/dma/sh/rcar-hpbdma.c
> ===================================================================
> --- slave-dma.orig/drivers/dma/sh/rcar-hpbdma.c
> +++ slave-dma/drivers/dma/sh/rcar-hpbdma.c
> @@ -93,6 +93,7 @@ struct hpb_dmae_chan {
>  	void __iomem *base;
>  	const struct hpb_dmae_slave_config *cfg;
>  	char dev_id[16];		/* unique name per DMAC of channel */
> +	dma_addr_t slave_addr;
>  };
>  
>  struct hpb_dmae_device {
> @@ -445,7 +446,8 @@ hpb_dmae_alloc_chan_resources(struct hpb
>  	return 0;
>  }
>  
> -static int hpb_dmae_set_slave(struct shdma_chan *schan, int slave_id, bool try)
> +static int hpb_dmae_set_slave(struct shdma_chan *schan, int slave_id,
> +			      dma_addr_t slave_addr, bool try)
>  {
>  	struct hpb_dmae_chan *chan = to_chan(schan);
>  	const struct hpb_dmae_slave_config *sc =
> @@ -456,6 +458,7 @@ static int hpb_dmae_set_slave(struct shd
>  	if (try)
>  		return 0;
>  	chan->cfg = sc;
> +	chan->slave_addr = slave_addr ? : sc->addr;
>  	return hpb_dmae_alloc_chan_resources(chan, sc);
>  }
>  
> @@ -467,7 +470,7 @@ static dma_addr_t hpb_dmae_slave_addr(st
>  {
>  	struct hpb_dmae_chan *chan = to_chan(schan);
>  
> -	return chan->cfg->addr;
> +	return chan->slave_addr;
>  }
>  
>  static struct shdma_desc *hpb_dmae_embedded_desc(void *buf, int i)
> --
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