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

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Date:   Thu, 08 Sep 2016 10:02:25 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Peter Chen <hzpeterchen@...il.com>
Cc:     Felipe Balbi <balbi@...nel.org>, Leo Li <pku.leo@...il.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Russell King - ARM Linux <linux@....linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>,
        lkml <linux-kernel@...r.kernel.org>,
        Stuart Yoder <stuart.yoder@....com>,
        Scott Wood <oss@...error.net>,
        David Fisher <david.fisher1@...opsys.com>,
        "Thang Q. Nguyen" <tqnguyen@....com>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] usb: dwc3: host: inherit dma configuration from parent dev

On Thursday, September 8, 2016 9:15:36 AM CEST Peter Chen wrote:
> > 
> > Right, I was specifically talking about the code in chipidea here,
> > which I think is never used on the PCI bus, and how the current
> > code is broken. We can probably do better than of_dma_configure()
> > (see below), but it would be an improvement.
> 
> Chipidea is also used at PCI bus too, see drivers/usb/chipidea/ci_hdrc_pci.c
> 

Ok, I see.

The experimental patch I posted should actually handle this just fine,
as it simply assumes that dev->parent is the device used for the DMA
API in chipidea, and I think this holds true for both the PCI and the
DT based uses of this driver.

	Arnd