linux-kernel - [PATCH 1/4] usb: dwc3: dwc3-omap: set dma_mask for dwc3 inorder for host mode to work

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Date:	Tue, 5 Mar 2013 19:51:57 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<grant.likely@...retlab.ca>, <rob.herring@...xeda.com>,
	<rob@...dley.net>, <balbi@...com>, <gregkh@...uxfoundation.org>,
	<kishon@...com>, <s-guiriec@...com>, <gg@...mlogic.co.uk>,
	<sameo@...ux.intel.com>, <broonie@...nsource.wolfsonmicro.com>,
	<ldewangan@...dia.com>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: [PATCH 1/4] usb: dwc3: dwc3-omap: set dma_mask for dwc3 inorder for host mode to work

While creating the child devices, *of_platform_populate* sets only
coherent_dma_mask but USBHCD sets *uses_dma* (determines whether the
controller is DMA'able) based on dma_mask. So If we haven't explicitly set
dma_mask, the HCD thinks the controller is not DMA'able and the
controller will fail. So explicity set dma_mask for dwc3 after
*of_platform_populate*.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/usb/dwc3/dwc3-omap.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index 35b9673..19c6e72 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -277,6 +277,14 @@ static void dwc3_omap_disable_irqs(struct dwc3_omap *omap)
 	dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_SET_0, 0x00);
 }
 
+static u64 dwc3_omap_dma_mask = DMA_BIT_MASK(32);
+
+static int dwc3_omap_set_dmamask(struct device *dev, void *c)
+{
+	dev->dma_mask = &dwc3_omap_dma_mask;
+	return 0;
+}
+
 static int dwc3_omap_probe(struct platform_device *pdev)
 {
 	struct device_node	*node = pdev->dev.of_node;
@@ -381,6 +389,8 @@ static int dwc3_omap_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	device_for_each_child(&pdev->dev, NULL, dwc3_omap_set_dmamask);
+
 	return 0;
 }
 
-- 
1.7.10.4

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