linux-kernel - Re: [PATCH v4 2/3] phy: qcom: qmp-combo: get the USB3 & DisplayPort lanes mapping from DT

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Message-ID: <9d020a8e-22d8-4f1f-803c-d00bb912f699@linaro.org>
Date: Wed, 1 Oct 2025 09:06:10 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I
 <kishon@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Xilin Wu <sophon@...xa.com>,
 linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/3] phy: qcom: qmp-combo: get the USB3 & DisplayPort
 lanes mapping from DT

On 9/30/25 20:56, Dmitry Baryshkov wrote:
> On Tue, Sep 30, 2025 at 09:39:48AM +0200, Neil Armstrong wrote:
>> The QMP USB3/DP Combo PHY hosts an USB3 phy and a DP PHY on top
>> of a combo glue to route either lanes to the 4 shared physical lanes.
>>
>> The routing of the lanes can be:
>> - 2 DP + 2 USB3
>> - 4 DP
>> - 2 USB3
>>
>> Get the lanes mapping from DT and stop registering the USB-C
>> muxes in favor of a static mode and orientation detemined
>> by the lanes mapping.
>>
>> This allows supporting boards with direct connection of USB3 and
>> DisplayPort lanes to the QMP Combo PHY lanes, not using the
>> USB-C Altmode feature.
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>> ---
>>   drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 145 ++++++++++++++++++++++++++++--
>>   1 file changed, 137 insertions(+), 8 deletions(-)
>>
>> @@ -4167,9 +4269,41 @@ static int qmp_combo_probe(struct platform_device *pdev)
>>   	if (ret)
>>   		goto err_node_put;
>>   
>> -	ret = qmp_combo_typec_register(qmp);
>> -	if (ret)
>> -		goto err_node_put;
>> +	qmp->qmpphy_mode = QMPPHY_MODE_USB3DP;
>> +
>> +	if (of_find_property(dev->of_node, "mode-switch", NULL) ||
>> +	    of_find_property(dev->of_node, "orientation-switch", NULL)) {
>> +		ret = qmp_combo_typec_register(qmp);
>> +		if (ret)
>> +			goto err_node_put;
>> +	} else {
>> +		enum typec_orientation dp_orientation = TYPEC_ORIENTATION_NONE;
>> +		enum typec_orientation usb3_orientation = TYPEC_ORIENTATION_NONE;
>> +
>> +		ret = qmp_combo_get_dt_dp_orientation(dev, &dp_orientation);
>> +		if (ret)
>> +			goto err_node_put;
>> +
>> +		ret = qmp_combo_get_dt_usb3_orientation(dev, &usb3_orientation);
>> +		if (ret)
>> +			goto err_node_put;
>> +
>> +		if (dp_orientation == TYPEC_ORIENTATION_NONE &&
>> +		    usb3_orientation != TYPEC_ORIENTATION_NONE) {
>> +			qmp->qmpphy_mode = QMPPHY_MODE_USB3_ONLY;
>> +			qmp->orientation = usb3_orientation;
>> +		} else if (usb3_orientation == TYPEC_ORIENTATION_NONE &&
>> +			 dp_orientation != TYPEC_ORIENTATION_NONE) {
>> +			qmp->qmpphy_mode = QMPPHY_MODE_DP_ONLY;
>> +			qmp->orientation = dp_orientation;
>> +		} else if (dp_orientation != TYPEC_ORIENTATION_NONE &&
>> +			 dp_orientation == usb3_orientation) {
>> +			qmp->qmpphy_mode = QMPPHY_MODE_USB3DP;
>> +			qmp->orientation = dp_orientation;
>> +		} else {
>> +			dev_warn(dev, "unable to determine orientation & mode from data-lanes");
>> +		}
>> +	}
>>   
>>   	ret = drm_aux_bridge_register(dev);
>>   	if (ret)
>> @@ -4189,11 +4323,6 @@ static int qmp_combo_probe(struct platform_device *pdev)
>>   	if (ret)
>>   		goto err_node_put;
>>   
>> -	/*
>> -	 * The hw default is USB3_ONLY, but USB3+DP mode lets us more easily
>> -	 * check both sub-blocks' init tables for blunders at probe time.
>> -	 */
>> -	qmp->qmpphy_mode = QMPPHY_MODE_USB3DP;
> 
> SHouldn't this still be a default in the 'normal' USB-C case?

It is, I just moved it before the added logic, but the comment doesn't really
apply anymore

Neil

> 
>>   
>>   	qmp->usb_phy = devm_phy_create(dev, usb_np, &qmp_combo_usb_phy_ops);
>>   	if (IS_ERR(qmp->usb_phy)) {
>>
>> -- 
>> 2.34.1
>>
>