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Subject[PATCH 1/4] usb: dwc3: dwc3-omap: set dma_mask for dwc3 inorder for host mode to work
Date
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@ti.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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