kernel/usb-make-xhci-platform-driver-use-64-bit-or-32-bit-D.patch

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From 30b01a7a85c0a2993870f7ed93059f9957bff59f Mon Sep 17 00:00:00 2001
From: Mark Langsdorf <mlangsdo@redhat.com>
Date: Wed, 25 Mar 2015 14:12:51 -0400
Subject: [PATCH 3/4] usb: make xhci platform driver use 64 bit or 32 bit DMA
The xhci platform driver needs to work on systems that either only
support 64-bit DMA or only support 32-bit DMA. Attempt to set a
coherent dma mask for 64-bit DMA, and attempt again with 32-bit
DMA if that fails.
Signed-off-by: Mark Langsdorf <mlangsdo@redhat.com>
---
drivers/usb/host/xhci-plat.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 0e11d61..cc5ca2c 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -83,14 +83,13 @@ static int xhci_plat_probe(struct platform_device *pdev)
if (irq < 0)
return -ENODEV;
- /* Initialize dma_mask and coherent_dma_mask to 32-bits */
- ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
- 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));
+ /* Try setting the coherent_dma_mask to 64 bits, then try 32 bits */
+ ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (ret) {
+ ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+ }
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd)
--
1.9.3