linux-kernel - Re: [PATCH 1/3] usb: typec: Add retimer handle to port altmode

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Message-ID: <Y8aJGSaFzhLucZvK@kuha.fi.intel.com>
Date:   Tue, 17 Jan 2023 13:40:09 +0200
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,
        bleung@...omium.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 1/3] usb: typec: Add retimer handle to port altmode

On Thu, Jan 12, 2023 at 10:16:06PM +0000, Prashant Malani wrote:
> Just like it does with muxes, the Type-C bus code can update the state
> of connected retimers (especially when altmode-related transitions
> occur). Add a retimer handle to the port altmode struct to enable this.
> 
> Signed-off-by: Prashant Malani <pmalani@...omium.org>

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

> ---
>  drivers/usb/typec/bus.h   |  2 ++
>  drivers/usb/typec/class.c | 15 +++++++++++++--
>  2 files changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/bus.h b/drivers/usb/typec/bus.h
> index 56dec268d4dd..c89168857417 100644
> --- a/drivers/usb/typec/bus.h
> +++ b/drivers/usb/typec/bus.h
> @@ -7,11 +7,13 @@
>  
>  struct bus_type;
>  struct typec_mux;
> +struct typec_retimer;
>  
>  struct altmode {
>  	unsigned int			id;
>  	struct typec_altmode		adev;
>  	struct typec_mux		*mux;
> +	struct typec_retimer		*retimer;
>  
>  	enum typec_port_data		roles;
>  
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 5897905cb4f0..ed3d070b1ca4 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -583,6 +583,7 @@ void typec_unregister_altmode(struct typec_altmode *adev)
>  {
>  	if (IS_ERR_OR_NULL(adev))
>  		return;
> +	typec_retimer_put(to_altmode(adev)->retimer);
>  	typec_mux_put(to_altmode(adev)->mux);
>  	device_unregister(&adev->dev);
>  }
> @@ -2108,16 +2109,26 @@ typec_port_register_altmode(struct typec_port *port,
>  {
>  	struct typec_altmode *adev;
>  	struct typec_mux *mux;
> +	struct typec_retimer *retimer;
>  
>  	mux = typec_mux_get(&port->dev, desc);
>  	if (IS_ERR(mux))
>  		return ERR_CAST(mux);
>  
> +	retimer = typec_retimer_get(&port->dev);
> +	if (IS_ERR(retimer)) {
> +		typec_mux_put(mux);
> +		return ERR_CAST(retimer);
> +	}
> +
>  	adev = typec_register_altmode(&port->dev, desc);
> -	if (IS_ERR(adev))
> +	if (IS_ERR(adev)) {
> +		typec_retimer_put(retimer);
>  		typec_mux_put(mux);
> -	else
> +	} else {
>  		to_altmode(adev)->mux = mux;
> +		to_altmode(adev)->retimer = retimer;
> +	}
>  
>  	return adev;
>  }
> -- 
> 2.39.0.314.g84b9a713c41-goog

-- 
heikki