linux-kernel - [PATCH v2] usb: dwc3: host: Set the dma

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Date:	Mon,  6 Jun 2016 13:56:11 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	balbi@...nel.org, gregkh@...uxfoundation.org
Cc:	broonie@...nel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, baolin.wang@...aro.org
Subject: [PATCH v2] usb: dwc3: host: Set the dma_ops for xhci device

On ARM64 platform, it will set 'dummy_dma_ops' for device dma_ops if
it did not call 'arch_setup_dma_ops' at device creation time, that will
cause failure when setting the dma mask for device.

Thus this patch set the xhci device dma_ops from the parent device if
the xhci device dma_ops is 'dummy_dma_ops'.

Changes since v1:
 - Add CONFIG_ARM64 macro.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/usb/dwc3/host.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index c679f63..edb666d 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -32,6 +32,11 @@ int dwc3_host_init(struct dwc3 *dwc)
 		return -ENOMEM;
 	}
 
+#ifdef CONFIG_ARM64
+	if (get_dma_ops(&xhci->dev) == get_dma_ops(NULL))
+		xhci->dev.archdata.dma_ops = get_dma_ops(dwc->dev);
+#endif
+
 	dma_set_coherent_mask(&xhci->dev, dwc->dev->coherent_dma_mask);
 
 	xhci->dev.parent	= dwc->dev;
-- 
1.7.9.5