linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: x1e80100-crd: Enable external DP support

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Message-ID: <ZvKdmhfxilFfOzmb@linaro.org>
Date: Tue, 24 Sep 2024 14:08:10 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Johan Hovold <johan@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Trilok Soni <quic_tsoni@...cinc.com>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: x1e80100-crd: Enable external DP
 support

On 24-09-02 21:54:58, Dmitry Baryshkov wrote:
> On Mon, Sep 02, 2024 at 06:01:35PM GMT, Abel Vesa wrote:
> > The Qualcomm Snapdragon X Elite CRD board has 3 USB Type-C ports,
> > all of them supporting external DP altmode. Between each QMP
> > combo PHY and the corresponding Type-C port, sits one Parade PS8830
> > retimer which handles both orientation and SBU muxing. Add nodes for
> > each retimer, fix the graphs between connectors and the PHYs accordingly,
> > add the voltage regulators needed by each retimer and then enable all
> > 3 remaining DPUs.
> > 
> > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> > ---
> >  arch/arm64/boot/dts/qcom/x1e80100-crd.dts | 414 +++++++++++++++++++++++++++++-
> >  1 file changed, 408 insertions(+), 6 deletions(-)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/x1e80100-crd.dts b/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> > index 10b28d870f08..6dfc85eda354 100644
> > --- a/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> > +++ b/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> 
> [skipped]
> 
> 
> > @@ -709,6 +861,163 @@ keyboard@3a {
> >  	};
> >  };
> >  
> > +&i2c1 {
> > +	clock-frequency = <400000>;
> > +
> > +	status = "okay";
> > +
> > +	typec-mux@8 {
> > +		compatible = "parade,ps8830";
> > +		reg = <0x08>;
> > +
> > +		clocks = <&rpmhcc RPMH_RF_CLK5>;
> > +		clock-names = "xo";
> > +
> > +		vdd15-supply = <&vreg_rtmr2_1p15>;
> > +		vdd18-supply = <&vreg_rtmr2_1p8>;
> > +		vdd33-supply = <&vreg_rtmr2_3p3>;
> > +
> > +		reset-gpios = <&tlmm 185 GPIO_ACTIVE_HIGH>;
> > +
> > +		orientation-switch;
> > +		retimer-switch;
> 
> Doesn't it need to listen to mode switching events? 4-lane DP vs
> 2/2-lane DP + USB3 requires propagating of the altmode events to the QMP
> PHY, see the original 4-lane series.

The mode is passed through the retimer state as well, isn't it?

> 
> > +
> > +		ports {
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +
> > +			port@0 {
> > +				reg = <0>;
> > +
> > +				retimer_ss2_ss_out: endpoint {
> > +					remote-endpoint = <&pmic_glink_ss2_ss_in>;
> > +				};
> > +			};
> > +
> > +			port@1 {
> > +				reg = <1>;
> > +
> > +				retimer_ss2_ss_in: endpoint {
> > +					remote-endpoint = <&usb_1_ss2_qmpphy_out>;
> > +				};
> > +			};
> > +
> > +			port@2 {
> > +				reg = <2>;
> > +
> > +				retimer_ss2_con_sbu_out: endpoint {
> > +					remote-endpoint = <&pmic_glink_ss2_con_sbu_in>;
> > +				};
> > +			};
> > +		};
> > +	};
> > +};
> > +
> 
> 
> > @@ -1164,7 +1566,7 @@ &usb_1_ss0_dwc3_hs {
> >  };
> >  
> >  &usb_1_ss0_qmpphy_out {
> > -	remote-endpoint = <&pmic_glink_ss0_ss_in>;
> > +	remote-endpoint = <&retimer_ss0_ss_in>;
> >  };
> 
> orientation-switch and mode-switch for the QMP PHY?

orientation-switch is already in the SoC dtsi nodes.

But the qmp phy doesn't currently support mode switching. Right?

> 
> >  
> >  &usb_1_ss1_hsphy {
> > @@ -1196,7 +1598,7 @@ &usb_1_ss1_dwc3_hs {
> >  };
> >  
> >  &usb_1_ss1_qmpphy_out {
> > -	remote-endpoint = <&pmic_glink_ss1_ss_in>;
> > +	remote-endpoint = <&retimer_ss1_ss_in>;
> >  };
> >  
> >  &usb_1_ss2_hsphy {
> > @@ -1228,5 +1630,5 @@ &usb_1_ss2_dwc3_hs {
> >  };
> >  
> >  &usb_1_ss2_qmpphy_out {
> > -	remote-endpoint = <&pmic_glink_ss2_ss_in>;
> > +	remote-endpoint = <&retimer_ss2_ss_in>;
> >  };
> > 
> > -- 
> > 2.34.1
> > 
> 
> -- 
> With best wishes
> Dmitry

Thanks for reviewing.

Abel