linux-kernel - Re: [PATCH v1 1/2] usb:dwc3: Enable support for 64-bit system

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Message-ID: <87h9ig9n88.fsf@ti.com>
Date:	Thu, 14 Jan 2016 09:47:51 -0600
From:	Felipe Balbi <balbi@...nel.org>
To:	"Thang Q. Nguyen" <tqnguyen@....com>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm@...ts.infradead.org
Cc:	Thang Nguyen <tqnguyen@....com>, Phong Vo <pvo@....com>,
	Loc Ho <lho@....com>, patches@....com
Subject: Re: [PATCH v1 1/2] usb:dwc3: Enable support for 64-bit system


Hi,

"Thang Q. Nguyen" <tqnguyen@....com> writes:
> Add 64-bit DMA operation support to the USB DWC3 driver.
> First attempt to set the coherent DMA mask for 64-bit DMA.
> If that failed, attempt again with 32-bit DMA.
>
> Signed-off-by: Thang Q. Nguyen <tqnguyen@....com>
> ---
>  drivers/usb/dwc3/core.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 22b47973..9818d6b 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -829,6 +829,21 @@ static int dwc3_probe(struct platform_device *pdev)
>  	dwc->mem = mem;
>  	dwc->dev = dev;
>  
> +	/* Try to set 64-bit DMA first */
> +	if (WARN_ON(!pdev->dev.dma_mask))

why the WARN_ON() ?

> +		/* Platform did not initialize dma_mask */
> +		ret = dma_coerce_mask_and_coherent(&pdev->dev,
> +						   DMA_BIT_MASK(64));
> +	else
> +		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> +
> +	/* If seting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
> +	if (ret) {

this will try 32-bit if 32-bit fails too.

> +		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> +		if (ret)
> +			return ret;
> +	}
> +
>  	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>  	if (!res) {
>  		dev_err(dev, "missing IRQ\n");
> -- 
> 2.2.0
>
> --
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-- 
balbi

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