linux-kernel - Re: [PATCH v2] fsldma: add support to 36-bit physical address

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Date:	Thu, 11 Nov 2010 05:56:01 -0600
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Li Yang <leoli@...escale.com>
Cc:	<dan.j.williams@...el.com>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] fsldma: add support to 36-bit physical address


On Nov 11, 2010, at 6:16 AM, Li Yang wrote:

> Expand the dma_mask of fsldma device to 36-bit, indicating that the
> DMA engine can deal with 36-bit physical address and does not need
> the SWIOTLB to create bounce buffer for it when doing dma_map_*().
> 
> Signed-off-by: Li Yang <leoli@...escale.com>
> ---
> Add more detailed commit message
> 
> drivers/dma/fsldma.c |    4 +++-
> 1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
> index cea08be..8c79b37 100644
> --- a/drivers/dma/fsldma.c
> +++ b/drivers/dma/fsldma.c
> @@ -1,7 +1,7 @@
> /*
>  * Freescale MPC85xx, MPC83xx DMA Engine support
>  *
> - * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
> + * Copyright (C) 2007-2010 Freescale Semiconductor, Inc. All rights reserved.
>  *
>  * Author:
>  *   Zhang Wei <wei.zhang@...escale.com>, Jul 2007
> @@ -1338,6 +1338,8 @@ static int __devinit fsldma_of_probe(struct platform_device *op,
> 	fdev->common.device_control = fsl_dma_device_control;
> 	fdev->common.dev = &op->dev;
> 
> +	dma_set_mask(&(op->dev), DMA_BIT_MASK(36));
> +

Is there any reason we shouldn't set DMA_BIT_MASK(64) since the DMA block programming model allows the address to be 64-bits?

> 	dev_set_drvdata(&op->dev, fdev);
> 
> 	/*
> -- 
> 1.6.6-rc1.GIT
> 

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