linux-kernel - Re: [PATCH v3] usb: common: usb-conn-gpio: Prevent bailing out if initial role is none

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Date:   Wed, 2 Aug 2023 13:58:33 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Prashanth K <quic_prashk@...cinc.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        "# 5 . 4" <stable@...r.kernel.org>
Subject: Re: [PATCH v3] usb: common: usb-conn-gpio: Prevent bailing out if
 initial role is none

On Tue, Aug 01, 2023 at 02:33:52PM +0530, Prashanth K wrote:
> Currently if we bootup a device without cable connected, then
> usb-conn-gpio won't call set_role() because last_role is same
> as current role. This happens since last_role gets initialised
> to zero during the probe.
> 
> To avoid this, add a new flag initial_detection into struct
> usb_conn_info, which prevents bailing out during initial
> detection.
> 
> Cc: <stable@...r.kernel.org> # 5.4
> Fixes: 4602f3bff266 ("usb: common: add USB GPIO based connection detection driver")
> Signed-off-by: Prashanth K <quic_prashk@...cinc.com>

FWIW:

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> v3: Added cc tag as suggested by the patch-bot.
> v2: Updated the bool name to initial_detection.
> 
>  drivers/usb/common/usb-conn-gpio.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
> index 766005d..501e8bc9 100644
> --- a/drivers/usb/common/usb-conn-gpio.c
> +++ b/drivers/usb/common/usb-conn-gpio.c
> @@ -42,6 +42,7 @@ struct usb_conn_info {
>  
>  	struct power_supply_desc desc;
>  	struct power_supply *charger;
> +	bool initial_detection;
>  };
>  
>  /*
> @@ -86,11 +87,13 @@ static void usb_conn_detect_cable(struct work_struct *work)
>  	dev_dbg(info->dev, "role %s -> %s, gpios: id %d, vbus %d\n",
>  		usb_role_string(info->last_role), usb_role_string(role), id, vbus);
>  
> -	if (info->last_role == role) {
> +	if (!info->initial_detection && info->last_role == role) {
>  		dev_warn(info->dev, "repeated role: %s\n", usb_role_string(role));
>  		return;
>  	}
>  
> +	info->initial_detection = false;
> +
>  	if (info->last_role == USB_ROLE_HOST && info->vbus)
>  		regulator_disable(info->vbus);
>  
> @@ -258,6 +261,7 @@ static int usb_conn_probe(struct platform_device *pdev)
>  	device_set_wakeup_capable(&pdev->dev, true);
>  
>  	/* Perform initial detection */
> +	info->initial_detection = true;
>  	usb_conn_queue_dwork(info, 0);
>  
>  	return 0;
> -- 
> 2.7.4

thanks,

-- 
heikki