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

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Message-Id: <1415128009-12182-1-git-send-email-fkan@apm.com>
Date:	Tue,  4 Nov 2014 11:06:49 -0800
From:	Feng Kan <fkan@....com>
To:	patches@....com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, mathias.nyman@...el.com
Cc:	Feng Kan <fkan@....com>, Bao Truong <btruong@....com>
Subject: [PATCH V2] usb:host:xhci-plat: 64-bit dma addressing support

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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