linux-kernel - Re: [PATCH] usb: dwc3: host: inherit dma configuration from parent dev

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Message-ID: <87d1pcrj0t.fsf@intel.com>
Date:	Tue, 26 Apr 2016 09:17:22 +0300
From:	Felipe Balbi <balbi@...nel.org>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, Sekhar Nori <nsekhar@...com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	David Fisher <david.fisher1@...opsys.com>,
	Catalin Marinas <catalin.marinas@....com>,
	"Thang Q. Nguyen" <tqnguyen@....com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Subject: Re: [PATCH] usb: dwc3: host: inherit dma configuration from parent dev


Hi,

Grygorii Strashko <grygorii.strashko@...com> writes:
> Now not all DMA paremters configured properly for "xhci-hcd" platform
> device which is created manually. For example: dma_pfn_offset, dam_ops
> and iommu configuration will not corresponds "dwc3" devices
> configuration. As result, this will cause problems like wrong DMA
> addresses translation on platforms with LPAE enabled like Keystone 2.
>
> When platform is using DT boot mode the DMA configuration will be
> parsed and applied from DT, so, to fix this issue, reuse
> of_dma_configure() API and retrieve DMA configuartion for "xhci-hcd"
> from DWC3 device node.

patch is incomplete. You left out non-DT users which might suffer from
the same problem.

-- 
balbi

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