41 lines
1.4 KiB
Diff
41 lines
1.4 KiB
Diff
From: Mark Langsdorf <mlangsdo@redhat.com>
|
|
Date: Wed, 25 Mar 2015 14:12:51 -0400
|
|
Subject: [PATCH] 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 890ad9d9d329..122b1fb12b7e 100644
|
|
--- a/drivers/usb/host/xhci-plat.c
|
|
+++ b/drivers/usb/host/xhci-plat.c
|
|
@@ -93,14 +93,13 @@ 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)
|