Hi,
"Thang Q. Nguyen" <tqnguyen@xxxxxxx> 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@xxxxxxx>
> ---
> 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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