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Date: Thu, 6 Jun 2024 14:53:38 +0200
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From: Neil Armstrong <neil.armstrong@linaro.org>
Reply-To: neil.armstrong@linaro.org
Subject: Re: [PATCH 2/2] usb: typec-mux: nb7vpq904m: broadcast typec state to
 next mux
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
 Bjorn Andersson <andersson@kernel.org>, Luca Weiss
 <luca.weiss@fairphone.com>, linux-arm-msm@vger.kernel.org,
 linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20240527-topic-sm8x50-upstream-retimer-broadcast-mode-v1-0-79ec91381aba@linaro.org>
 <20240527-topic-sm8x50-upstream-retimer-broadcast-mode-v1-2-79ec91381aba@linaro.org>
 <jdqnlfuqount32ralk4jr3beobdt7dgs3h4lcpxj5fbmanysl6@pgwqeozl7ow5>
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On 27/05/2024 11:18, Dmitry Baryshkov wrote:
> On Mon, May 27, 2024 at 09:45:30AM +0200, Neil Armstrong wrote:
>> In the Type-C graph, the nb7vpq904m 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 nb7vpq904m retimer to get an optional type-c mux on the next
>> endpoint, and broadcast the received mode to it.
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
>> ---
>>   drivers/usb/typec/mux/nb7vpq904m.c | 29 +++++++++++++++++++++++++++--
>>   1 file changed, 27 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/typec/mux/nb7vpq904m.c b/drivers/usb/typec/mux/nb7vpq904m.c
>> index b17826713753..efb10f890fed 100644
>> --- a/drivers/usb/typec/mux/nb7vpq904m.c
>> +++ b/drivers/usb/typec/mux/nb7vpq904m.c
>> @@ -69,6 +69,7 @@ struct nb7vpq904m {
>>   
>>   	bool swap_data_lanes;
>>   	struct typec_switch *typec_switch;
>> +	struct typec_mux *typec_mux;
>>   
>>   	struct mutex lock; /* protect non-concurrent retimer & switch */
>>   
>> @@ -275,6 +276,7 @@ static int nb7vpq904m_sw_set(struct typec_switch_dev *sw, enum typec_orientation
>>   static int nb7vpq904m_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)
>>   {
>>   	struct nb7vpq904m *nb7 = typec_retimer_get_drvdata(retimer);
>> +	struct typec_mux_state mux_state;
>>   	int ret = 0;
>>   
>>   	mutex_lock(&nb7->lock);
>> @@ -292,7 +294,14 @@ static int nb7vpq904m_retimer_set(struct typec_retimer *retimer, struct typec_re
>>   
>>   	mutex_unlock(&nb7->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(nb7->typec_mux, &mux_state);
>>   }
>>   
>>   static const struct regmap_config nb7_regmap = {
>> @@ -411,9 +420,16 @@ static int nb7vpq904m_probe(struct i2c_client *client)
>>   		return dev_err_probe(dev, PTR_ERR(nb7->typec_switch),
>>   				     "failed to acquire orientation-switch\n");
>>   
>> +	nb7->typec_mux = fwnode_typec_mux_get(dev->fwnode);
>> +	if (IS_ERR(nb7->typec_mux)) {
>> +		ret = dev_err_probe(dev, PTR_ERR(nb7->typec_mux),
>> +				    "Failed to acquire mode-switch\n");
>> +		goto err_switch_put;
>> +	}
>> +
>>   	ret = nb7vpq904m_parse_data_lanes_mapping(nb7);
>>   	if (ret)
>> -		return ret;
>> +		goto err_mux_put;
>>   
>>   	ret = regulator_enable(nb7->vcc_supply);
>>   	if (ret)
>> @@ -456,6 +472,12 @@ static int nb7vpq904m_probe(struct i2c_client *client)
>>   	gpiod_set_value(nb7->enable_gpio, 0);
>>   	regulator_disable(nb7->vcc_supply);
>>   
>> +err_mux_put:
>> +	typec_mux_put(nb7->typec_mux);
>> +
>> +err_switch_put:
>> +	typec_switch_put(nb7->typec_switch);
> 
> Same comment, typec_switch_put should go to a separate commit. IMHO it
> almost begs us to have devm_fwnode_typec_mux_get() and
> devm_fwnode_typec_switch_get().

Yep

Thx,
Neil

> 
>> +
>>   	return ret;
>>   }
>>   
>> @@ -469,6 +491,9 @@ static void nb7vpq904m_remove(struct i2c_client *client)
>>   	gpiod_set_value(nb7->enable_gpio, 0);
>>   
>>   	regulator_disable(nb7->vcc_supply);
>> +
>> +	typec_mux_put(nb7->typec_mux);
>> +	typec_switch_put(nb7->typec_switch);
>>   }
>>   
>>   static const struct i2c_device_id nb7vpq904m_table[] = {
>>
>> -- 
>> 2.34.1
>>
>