linux-kernel - Re: [PATCH V2] usb:host:xhci-plat: 64-bit dma addressing support

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Message-ID: <CAL85gmA=dD7RC2MW5qTsOS+SmcptVuj4PMVo7CKd8v1KbDSz0g@mail.gmail.com>
Date:	Thu, 13 Nov 2014 16:22:55 -0800
From:	Feng Kan <fkan@....com>
To:	patches <patches@....com>, linux-usb@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	mathias.nyman@...el.com
Cc:	Feng Kan <fkan@....com>, Bao Truong <btruong@....com>
Subject: Re: [PATCH V2] usb:host:xhci-plat: 64-bit dma addressing support

Just want to ping this again to see if there is any comments, thanks.

On Tue, Nov 4, 2014 at 11:06 AM, Feng Kan <fkan@....com> wrote:
> Use dma_addr_t to support 64-bit plaforms, which access beyond the default
> 32 bit address range.
>
> Signed-off-by: Bao Truong <btruong@....com>
> Signed-off-by: Feng Kan <fkan@....com>
> ---
>  Changes:
>         V2: fixed GKH's comment regarding not mark up the comment after
>             code change.
>
>  drivers/usb/host/xhci-plat.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 3d78b0c..f75764f 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -96,14 +96,18 @@ static int xhci_plat_probe(struct platform_device *pdev)
>                         return ret;
>         }
>
> -       /* Initialize dma_mask and coherent_dma_mask to 32-bits */
> -       ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
> +       /*
> +        * Initialize dma_mask and coherent_dma_mask to valid DMA or bus
> +        * address for the platform.
> +        */
> +       ret = dma_set_coherent_mask(&pdev->dev,
> +                                       DMA_BIT_MASK(sizeof(dma_addr_t)*8));
>         if (ret)
>                 return ret;
>         if (!pdev->dev.dma_mask)
>                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
>         else
> -               dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
> +               dma_set_mask(&pdev->dev, DMA_BIT_MASK(sizeof(dma_addr_t)*8));
>
>         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
>         if (!hcd)
> --
> 1.9.1
>
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