linux-kernel - Re: [PATCH 2/9] usb: typec: Add retimer handle to port

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Message-ID: <Yr1eW1gHR7LGP70Y@kuha.fi.intel.com>
Date:   Thu, 30 Jun 2022 11:27:07 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        chrome-platform@...ts.linux.dev, bleung@...omium.org,
        Daisuke Nojiri <dnojiri@...omium.org>,
        "Dustin L. Howett" <dustin@...ett.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: Re: [PATCH 2/9] usb: typec: Add retimer handle to port

Hi,

On Wed, Jun 29, 2022 at 11:32:20PM +0000, Prashant Malani wrote:
> Similar to mux and orientation switch, add a handle for registered
> retimer to the port, so that it has handles to the various switches
> connected to it.
> 
> Signed-off-by: Prashant Malani <pmalani@...omium.org>
> ---
>  drivers/usb/typec/class.c | 8 ++++++++
>  drivers/usb/typec/class.h | 1 +
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 2fa0b3718d23..2bc5fbdb25dd 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -12,6 +12,7 @@
>  #include <linux/slab.h>
>  #include <linux/usb/pd_vdo.h>
>  #include <linux/usb/typec_mux.h>
> +#include <linux/usb/typec_retimer.h>
>  
>  #include "bus.h"
>  #include "class.h"
> @@ -2249,6 +2250,13 @@ struct typec_port *typec_register_port(struct device *parent,
>  		return ERR_PTR(ret);
>  	}
>  
> +	port->retimer = typec_retimer_get(&port->dev);
> +	if (IS_ERR(port->retimer)) {
> +		ret = PTR_ERR(port->retimer);
> +		put_device(&port->dev);
> +		return ERR_PTR(ret);
> +	}
> +
>  	ret = device_add(&port->dev);
>  	if (ret) {
>  		dev_err(parent, "failed to register port (%d)\n", ret);

I think you need to release the reference with typec_retimer_put() in
typec_release().

I guess we can look handle this later, but there can actually be two
onboard retimers for each connector.

thanks,

> diff --git a/drivers/usb/typec/class.h b/drivers/usb/typec/class.h
> index 1bb1da124109..97520406929e 100644
> --- a/drivers/usb/typec/class.h
> +++ b/drivers/usb/typec/class.h
> @@ -55,6 +55,7 @@ struct typec_port {
>  	enum typec_orientation		orientation;
>  	struct typec_switch		*sw;
>  	struct typec_mux		*mux;
> +	struct typec_retimer		*retimer;
>  
>  	const struct typec_capability	*cap;
>  	const struct typec_operations   *ops;

-- 
heikki