linux-kernel - Re: [PATCH v2 10/10] usb: chipidea: tegra: Add USB_TEGRA

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Date:   Fri, 20 Dec 2019 03:56:52 +0000
From:   Peter Chen <peter.chen@....com>
To:     Dmitry Osipenko <digetx@...il.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Felipe Balbi <balbi@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 10/10] usb: chipidea: tegra: Add USB_TEGRA_PHY module
 to driver's dependencies

On 19-12-20 04:52:38, Dmitry Osipenko wrote:
> Now, when ci_hdrc_tegra kernel module is loaded, the phy_tegra_usb module
> is loaded too regardless of kernel's configuration. Previously this
> problem was masked because Tegra's EHCI driver is usually enabled in
> kernel's config and thus PHY driver was getting loaded because of it, but
> now I was making some more thorough testing and noticed that PHY's module
> isn't getting auto-loaded without the host driver.
> 
> Note that ChipIdea's driver doesn't use any of the exported functions of
> phy_tegra_usb module and thus the module needs to be requested explicitly.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/usb/chipidea/Kconfig         | 1 +
>  drivers/usb/chipidea/ci_hdrc_tegra.c | 6 ++++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
> index ae850b3fddf2..d53db520e209 100644
> --- a/drivers/usb/chipidea/Kconfig
> +++ b/drivers/usb/chipidea/Kconfig
> @@ -7,6 +7,7 @@ config USB_CHIPIDEA
>  	select RESET_CONTROLLER
>  	select USB_ULPI_BUS
>  	select USB_ROLE_SWITCH
> +	select USB_TEGRA_PHY if ARCH_TEGRA
>  	help
>  	  Say Y here if your system has a dual role high speed USB
>  	  controller based on ChipIdea silicon IP. It supports:
> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
> index 7455df0ede49..8bc11100245d 100644
> --- a/drivers/usb/chipidea/ci_hdrc_tegra.c
> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
> @@ -53,6 +53,12 @@ static int tegra_udc_probe(struct platform_device *pdev)
>  	struct tegra_udc *udc;
>  	int err;
>  
> +	if (IS_MODULE(CONFIG_USB_TEGRA_PHY)) {
> +		err = request_module("phy_tegra_usb");
> +		if (err)
> +			return err;
> +	}
> +

Why you do this dependency, if this controller driver can't
get USB PHY, it should return error. What's the return value
after calling below:

	udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);

Peter
>  	udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
>  	if (!udc)
>  		return -ENOMEM;
> -- 
> 2.24.0
> 

-- 

Thanks,
Peter Chen