linux-kernel - Re: [PATCH 1/2] usb: typec-mux: ptn36502: broadcast typec state to next mux

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Date: Mon, 27 May 2024 12:16:12 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Bjorn Andersson <andersson@...nel.org>, 
	Luca Weiss <luca.weiss@...rphone.com>, linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] usb: typec-mux: ptn36502: broadcast typec state to
 next mux

On Mon, May 27, 2024 at 09:45:29AM +0200, Neil Armstrong wrote:
> In the Type-C graph, the ptn36502 retimer is in between the USB-C
> connector and the USB3/DP combo PHY, and this PHY also requires the
> USB-C mode events to properly set-up the SuperSpeed Lanes functions
> to setup USB3-only, USB3 + DP Altmode or DP Altmode only on the 4 lanes.
> 
> Update the ptn36502 retimer to get an optional type-c mux on the next
> endpoint, and broadcast the received mode to it.
> 
> Tested-by: Luca Weiss <luca.weiss@...rphone.com>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> 
> --
> 
> Reported Tested by Luca in [1]
> 
> [1] https://lore.kernel.org/all/D1HOCBW6RG72.1B2RKGKW2Q5VC@fairphone.com/
> ---
>  drivers/usb/typec/mux/ptn36502.c | 33 ++++++++++++++++++++++++++++++---
>  1 file changed, 30 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/typec/mux/ptn36502.c b/drivers/usb/typec/mux/ptn36502.c
> index 0ec86ef32a87..129d9d24b932 100644
> --- a/drivers/usb/typec/mux/ptn36502.c
> +++ b/drivers/usb/typec/mux/ptn36502.c
> @@ -67,6 +67,7 @@ struct ptn36502 {
>  	struct typec_retimer *retimer;
>  
>  	struct typec_switch *typec_switch;
> +	struct typec_mux *typec_mux;
>  
>  	struct mutex lock; /* protect non-concurrent retimer & switch */
>  
> @@ -235,6 +236,7 @@ static int ptn36502_sw_set(struct typec_switch_dev *sw, enum typec_orientation o
>  static int ptn36502_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)
>  {
>  	struct ptn36502 *ptn = typec_retimer_get_drvdata(retimer);
> +	struct typec_mux_state mux_state;
>  	int ret = 0;
>  
>  	mutex_lock(&ptn->lock);
> @@ -252,7 +254,14 @@ static int ptn36502_retimer_set(struct typec_retimer *retimer, struct typec_reti
>  
>  	mutex_unlock(&ptn->lock);
>  
> -	return ret;
> +	if (ret)
> +		return ret;
> +
> +	mux_state.alt = state->alt;
> +	mux_state.data = state->data;
> +	mux_state.mode = state->mode;
> +
> +	return typec_mux_set(ptn->typec_mux, &mux_state);
>  }
>  
>  static int ptn36502_detect(struct ptn36502 *ptn)
> @@ -321,9 +330,18 @@ static int ptn36502_probe(struct i2c_client *client)
>  		return dev_err_probe(dev, PTR_ERR(ptn->typec_switch),
>  				     "Failed to acquire orientation-switch\n");
>  
> +	ptn->typec_mux = fwnode_typec_mux_get(dev->fwnode);
> +	if (IS_ERR(ptn->typec_mux)) {
> +		ret = dev_err_probe(dev, PTR_ERR(ptn->typec_mux),
> +				    "Failed to acquire mode-switch\n");
> +		goto err_switch_put;
> +	}
> +
>  	ret = regulator_enable(ptn->vdd18_supply);
> -	if (ret)
> -		return dev_err_probe(dev, ret, "Failed to enable vdd18\n");
> +	if (ret) {
> +		ret = dev_err_probe(dev, ret, "Failed to enable vdd18\n");
> +		goto err_mux_put;
> +	}
>  
>  	ret = ptn36502_detect(ptn);
>  	if (ret)
> @@ -363,6 +381,12 @@ static int ptn36502_probe(struct i2c_client *client)
>  err_disable_regulator:
>  	regulator_disable(ptn->vdd18_supply);
>  
> +err_mux_put:
> +	typec_mux_put(ptn->typec_mux);
> +
> +err_switch_put:
> +	typec_switch_put(ptn->typec_switch);

Please split typec_switch_put() to a separate patch, it's a fix.

> +
>  	return ret;
>  }
>  
> @@ -374,6 +398,9 @@ static void ptn36502_remove(struct i2c_client *client)
>  	typec_switch_unregister(ptn->sw);
>  
>  	regulator_disable(ptn->vdd18_supply);
> +
> +	typec_mux_put(ptn->typec_mux);
> +	typec_switch_put(ptn->typec_switch);
>  }
>  
>  static const struct i2c_device_id ptn36502_table[] = {
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry