Re: [PATCH][CFT]: dmaengine: make slave address physical

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Hi Vinod,

On Sunday 21 February 2016 20:50:46 Vinod Koul wrote:
> The slave dmaengine semantics required the client to map dma
> addresses and pass DMA address to dmaengine drivers. While this

s/While this/This/ ?

> was a convenient notion coming from generic dma offload cases
> where dmaengines are interchangeable and client is not aware of
> which engine to map to.
> 
> But in case of slave, we know the dmaengine and always use a
> specific one. Further the IOMMU cases can lead to failure of this
> notion, so make this as physical address and now dmaengine driver
> will do the required mapping.

You could also add "This finally bring the code in sync with the 
documentation.".

> Original-patch-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>

It took a long time but we finally got there :-) Thank you.

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

> ---
>  include/linux/dmaengine.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index 16a1cad30c33..d85ecd20af50 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -357,8 +357,8 @@ enum dma_slave_buswidth {
>   */
>  struct dma_slave_config {
>  	enum dma_transfer_direction direction;
> -	dma_addr_t src_addr;
> -	dma_addr_t dst_addr;
> +	phys_addr_t src_addr;
> +	phys_addr_t dst_addr;
>  	enum dma_slave_buswidth src_addr_width;
>  	enum dma_slave_buswidth dst_addr_width;
>  	u32 src_maxburst;

-- 
Regards,

Laurent Pinchart

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