linux-kernel - Re: [PATCH v6 07/12] usb: chipidea: add a usb2 driver for ci13xxx

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Date:	Tue, 30 Sep 2014 12:03:42 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Peter Chen <peter.chen@...escale.com>,
	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
	devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, balbi@...com,
	alexandre.belloni@...e-electrons.com, p.zabel@...gutronix.de,
	jszhang@...vell.com, sebastian.hesselbarth@...il.com
Subject: Re: [PATCH v6 07/12] usb: chipidea: add a usb2 driver for ci13xxx

On Tuesday 30 September 2014 08:12:07 Peter Chen wrote:
> > +
> > +     if (dev->of_node) {
> > +             ret = ci_hdrc_usb2_dt_probe(dev, ci_pdata);
> > +             if (ret)
> > +                     goto clk_err;
> > +     } else {
> > +             ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> > +             if (ret)
> > +                     goto clk_err;
> > +     }
> 
> My suggestion:
> 
> - call dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)) for both 
> dt and non-dt

No, as I explained before, hardcoding the dma mask is always wrong, don't
do that. Call dma_set_mask_and_coherent and check the return value.
It's not wrong to do that for both DT and ATAGS.

	Arnd
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