linux-kernel - Re: [PATCH] USB: ehci-s5p: Fix phy reset

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Message-ID: <CAD=FV=UXaZvZJOZwAguwi=iyYO1iMSvt8fdEsDhr96pgMXDYSg@mail.gmail.com>
Date:	Wed, 13 Mar 2013 10:28:50 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Alexander Graf <agraf@...e.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	dmueller@...e.de, Vivek Gautam <gautam.vivek@...sung.com>,
	Jingoo Han <jg1.han@...sung.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] USB: ehci-s5p: Fix phy reset

Alexander,

On Tue, Mar 12, 2013 at 6:09 PM, Alexander Graf <agraf@...e.de> wrote:
> -       err = gpio_request_one(gpio, GPIOF_OUT_INIT_HIGH, "ehci_vbus_gpio");
> -       if (err)
> +       /* reset pulls the line down, then up again */
> +       err = gpio_request_one(gpio, GPIOF_OUT_INIT_LOW, "ehci_vbus_gpio");
> +       if (err) {
>                 dev_err(&pdev->dev, "can't request ehci vbus gpio %d", gpio);
> +               return;
> +       }
> +       mdelay(1);
> +       __gpio_set_value(gpio, 1);
> +       gpio_free(gpio);

Freeing the gpio is a little on the iffy side since you actually care
about keeping the value.  Perhaps you can change this to
devm_gpio_request_one() and avoid the free?  I was about to submit a
patch to do just that (since otherwise you run into trouble if you
ever defer the probe) but then ran across your patch.

Thanks!

-Doug
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