linux-kernel - Re: [PATCH v3 2/2] usb:dwc3: pass arch data to xhci-hcd child

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Date:	Wed, 30 Mar 2016 16:55:07 +0300
From:	Felipe Balbi <felipe.balbi@...ux.intel.com>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	"Thang Q. Nguyen" <tqnguyen@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>,
	"Karicheri\, Muralidharan" <m-karicheri2@...com>,
	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Phong Vo <pvo@....com>, Loc Ho <lho@....com>, patches@....com,
	Santosh Shilimkar <ssantosh@...nel.org>,
	"Ben Dooks \(embedded platforms\)" <ben-linux@...ff.org>
Subject: Re: [PATCH v3 2/2] usb:dwc3: pass arch data to xhci-hcd child

Grygorii Strashko <grygorii.strashko@...com> writes:

> [ text/plain ]
> On 03/30/2016 04:10 PM, Felipe Balbi wrote:
>> "Thang Q. Nguyen" <tqnguyen@....com> writes:
>> 
>>> [ text/plain ]
>>> From: "Thang Q. Nguyen" <tqnguyen@....com>
>>>
>>> The xhci-hcd child node needs to inherit archdata attribute to use
>>> dma_ops functions and attributes. This patch enables the USB DWC3
>>> driver to pass archdata attributes to its xhci-hcd child node.
>>>
>>> Changes from v2:
>>> 	- None
>>>
>>> Changes from v1:
>>> 	- None
>> 
>> changes should be between tearline and diffstat.
>> 
>
> uh. This become a real problem :(, especially with LPAE enabled.
> DMA properties need to be inherited not only here, but also in
> usb_add_gadget_udc_release(). And probably in other places
>  where devices are created manually - the worst case : device is created
> manually but doesn't belong to any bus.
>
> And DMA configuration must include dma_pfn_offset also!
> And how about iommu staff?
>
> FYI. Solution used for PCI
> c49b8fc of/pci: Add of_pci_dma_configure() to update DMA configuration
>
> Rejected: introduce dma_init_dev_from_parent() or smth. like this
> http://permalink.gmane.org/gmane.linux.ports.arm.kernel/378317

I like this very much. Meanwhile, we need something (although, $subject
is not very good).

-- 
balbi

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