linux-kernel - Re: [PATCH 1/3 v2] usb: host: fotg2: add device tree probing

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Message-ID: <3421824.lhyKKsOD1E@wuerfel>
Date:   Fri, 10 Feb 2017 21:26:55 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Hans Ulli Kroll <ulli.kroll@...glemail.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 1/3 v2] usb: host: fotg2: add device tree probing

On Friday, February 10, 2017 2:12:36 PM CET Linus Walleij wrote:
> 
> > +       /* Right now device-tree probed devices don't get dma_mask set.
> > +        * Since shared usb code relies on it, set it here for now.
> > +        * Once we have dma capability bindings this can go away.
> > +        */
> > +
> > +       retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> > +       if (retval)
> > +               goto fail_create_hcd;
> 
> Were you able to test this part? I saw the gemini has some DMA engine
> but I never saw a driver for it. It looks like a reasonable thing to do to
> my untrained DMA eye.

We should never use dma_coerce_mask_and_coherent() for new code, it's
only needed for broken platforms without DT.

A 32-bit mask is set by default.

	Arnd