linux-kernel - RE: [PATCH v2 1/2] usb:dwc3: Enable support for 64-bit system

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Date:	Tue, 16 Feb 2016 17:56:01 +0700
From:	"Thang Q. Nguyen" <tqnguyen@....com>
To:	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:	Phong Vo <pvo@....com>, Loc Ho <lho@....com>,
	patches <patches@....com>
Subject: RE: [PATCH v2 1/2] usb:dwc3: Enable support for 64-bit system

Hi,
Do you have any more feedback on this patch?

Thanks,
Thang Q. Nguyen -
-----Original Message-----
From: Thang Q. Nguyen [mailto:tqnguyen@....com]
Sent: Monday, January 25, 2016 9:26 PM
To: Felipe Balbi; Greg Kroah-Hartman; linux-usb@...r.kernel.org;
linux-omap@...r.kernel.org; linux-kernel@...r.kernel.org;
linux-arm@...ts.infradead.org
Cc: Thang Nguyen; Phong Vo; Loc Ho; patches@....com
Subject: [PATCH v2 1/2] usb:dwc3: Enable support for 64-bit system

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>
---
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