linux-kernel - Re: [RFC 00/10] Add USB support for Hikey 970

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Date:   Fri, 4 Sep 2020 13:34:53 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Robin Murphy <robin.murphy@....com>, linuxarm@...wei.com,
        mauro.chehab@...wei.com, John Stultz <john.stultz@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Arnd Bergmann <arnd@...db.de>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>, Yu Chen <chenyu56@...wei.com>,
        Rob Herring <robh+dt@...nel.org>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Liam Girdwood <lgirdwood@...il.com>,
        Wei Xu <xuwei5@...ilicon.com>
Subject: Re: [RFC 00/10] Add USB support for Hikey 970

On Fri, Sep 04, 2020 at 02:28:49PM +0200, Mauro Carvalho Chehab wrote:

> It sounds that the only power supply related to USB is for the USB
> hub (ldo17), with sounds unlikely to affect dwc3. Yet, just in case,
> I added a dirty hack at dwc3_probe:

> <snip>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 25c686a752b0..e42be91fe6c2 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1491,6 +1491,11 @@ static int dwc3_probe(struct platform_device *pdev)
>  
>  	}

> +struct regulator *reg;
> +reg = devm_regulator_get(dev, "ldo17");
> +ret = PTR_ERR_OR_ZERO(reg);
> +if (ret) return ret;

A regulator_get() is going to do absolutely nothing to the state of the
regulator, if you're trying to enable it you need to do regulator_enable()

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