linux-kernel - Re: [PATCH] usb:host:xhci-plat: 64-bit dma addressing support

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Date:	Mon, 3 Nov 2014 18:11:03 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Feng Kan <fkan@....com>
Cc:	patches@....com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, mathias.nyman@...el.com,
	Bao Truong <btruong@....com>
Subject: Re: [PATCH] usb:host:xhci-plat: 64-bit dma addressing support

On Mon, Nov 03, 2014 at 05:59:28PM -0800, Feng Kan wrote:
> Use dma_addr_t to support 64-bit plaforms, which access beyond 32 bit
> address range.
> 
> Signed-off-by: Bao Truong <btruong@....com>
> Signed-off-by: Feng Kan <fkan@....com>
> ---
>  drivers/usb/host/xhci-plat.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 01d1862..8cf83f0 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -97,13 +97,14 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  	}
>  
>  	/* Initialize dma_mask and coherent_dma_mask to 32-bits */
> -	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
> +	ret = dma_set_coherent_mask(&pdev->dev,
> +					DMA_BIT_MASK(sizeof(dma_addr_t)*8));

Is the comment still correct now?

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