linux-kernel - Re: [PATCH] drivers: usb: dwc3 : Configure DMA properties and ops from DT

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Date:	Wed, 25 May 2016 14:31:16 -0500
From:	Leo Li <pku.leo@...il.com>
To:	Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc:	Rajesh Bhagat <rajesh.bhagat@....com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Li Yang <leoyang.li@....com>, sriram.dash@....com
Subject: Re: [PATCH] drivers: usb: dwc3 : Configure DMA properties and ops
 from DT

On Wed, May 4, 2016 at 2:57 AM, Felipe Balbi
<felipe.balbi@...ux.intel.com> wrote:
>
> Hi,
>
> Rajesh Bhagat <rajesh.bhagat@....com> writes:
>> On certain platforms (e.g. ARM64) the dma_ops needs to be explicitly set
>> to be able to do DMA allocations, so use the of_dma_configure() helper
>> to populate the dma properties and assign an appropriate dma_ops.
>>
>> Signed-off-by: Rajesh Bhagat <rajesh.bhagat@....com>
>> Reviewed-by: Yang-Leo Li <leoyang.li@....com>
>
> Cool, nxp is also using dwc3 :-) C'mon Rajesh, send us a glue layer :)
>
>> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
>> index c679f63..4d5b783 100644
>> --- a/drivers/usb/dwc3/host.c
>> +++ b/drivers/usb/dwc3/host.c
>> @@ -17,6 +17,7 @@
>>
>>  #include <linux/platform_device.h>
>>  #include <linux/usb/xhci_pdriver.h>
>> +#include <linux/of_device.h>
>>
>>  #include "core.h"
>>
>> @@ -32,6 +33,9 @@ int dwc3_host_init(struct dwc3 *dwc)
>>               return -ENOMEM;
>>       }
>>
>> +     if (IS_ENABLED(CONFIG_OF) && dwc->dev->of_node)
>> +             of_dma_configure(&xhci->dev, dwc->dev->of_node);
>
> okay, so we have a long discussion about this going on. You can catch up
> with it starting here:
>
> http://marc.info/?i=1461612094-30939-1-git-send-email-grygorii.strashko@ti.com
>
> At least for now, this patch will be applied. We need to have a better
> solution for this, one that helps not only DT platforms.

Balbi,

Has the patch from Grygorii been applied?  I don't see it in the
mainline tree yet.  Without fix, the dwc3 driver will fail for all
ARM64 SoCs.

Regards,
Leo