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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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@xxxxxx>
---
 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

--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux