linux-kernel - Re: [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 17:11:04 +0200
From:	Felipe Balbi <balbi@...com>
To:	kishon <kishon@...com>
CC:	<balbi@...com>, <grant.likely@...retlab.ca>,
	<rob.herring@...xeda.com>, <rob@...dley.net>,
	<gregkh@...uxfoundation.org>, <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: Re: [PATCH 1/4] usb: dwc3: dwc3-omap: set dma_mask for dwc3 inorder
 for host mode to work

On Tue, Mar 05, 2013 at 08:29:34PM +0530, kishon wrote:
> Hi,
> 
> On Tuesday 05 March 2013 08:24 PM, Felipe Balbi wrote:
> >On Tue, Mar 05, 2013 at 07:51:57PM +0530, Kishon Vijay Abraham I wrote:
> >>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);
> >
> >I don't think this is correct. Child should be setting its own by
> >copying from parent. In summary I think we should add this to dwc3 core:
> >
> >dma_set_coherent_mask(&pdev->dev, pdev->dev.parent->coherent_dma_mask);
> >pdev->dev.dma_mask = pdev->dev.parent->dma_mask;
> >pdev->dev.dma_parms = pdev->dev.parent->dma_parms;
> >
> >And add the same thing to xhci-plat.c btw.
> 
> hmm.. ok.

another thing, this means that we can remove similar code from
dwc3-pci.c and dwc3-exynos.c ;-)

-- 
balbi

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