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> --- Changes from v1: - Remove WARN_ON if dma_mask is NULL 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 de5e01f..2479c24 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -831,6 +831,21 @@ static int dwc3_probe(struct platform_device *pdev) dwc->mem = mem; dwc->dev = dev; + /* Try to set 64-bit DMA first */ + if (!pdev->dev.dma_mask) + /* 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) { + 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 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html