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 20:29:34 +0530
From:	kishon <kishon@...com>
To:	<balbi@...com>
CC:	<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

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.

Thanks
Kishon
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