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: <3i3euwqqvtqgyqgxbylbrj3dk2cyyavinb5v7ocevi4x6o25y5@66fodqy736kq>
Date: Sat, 4 Oct 2025 09:46:33 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Neil Armstrong <neil.armstrong@...aro.org>
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 Wed, Oct 01, 2025 at 09:06:10AM +0200, Neil Armstrong wrote:
> 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

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry