Re: [PATCH v2] arm64/dts/qcom/sc7180: Add Display Port dt node

Bjorn Andersson
2021-06-03T16:53:24Z

On Thu 03 Jun 11:09 CDT 2021, Kuogee Hsieh wrote:

> Add DP device node on sc7180.
>
> Changes in v2:
> -- replace msm_dp with dp
> -- replace dp_opp_table with opp_table
>

I'm sorry for those suggestions, I don't like either one of them.

And for everything but changes to the DRM code the changelog goes below
the --- line, so it's not part of the git history.

> Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
> ---
> arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 9 ++++
> arch/arm64/boot/dts/qcom/sc7180.dtsi | 78 ++++++++++++++++++++++++++++
> 2 files changed, 87 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> index 24d293e..40367a2 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> @@ -786,6 +786,15 @@ hp_i2c: &i2c9 {
> status = "okay";
> };
>
> +&dp {
> + status = "okay";
> + pinctrl-names = "default";
> + pinctrl-0 = <&dp_hot_plug_det>;
> + data-lanes = <0 1>;

Is it a limitation of the EC in Trogdor that you can only do 2 lanes?

> + vdda-1p2-supply = <&vdda_usb_ss_dp_1p2>;
> + vdda-0p9-supply = <&vdda_usb_ss_dp_core>;
> +};
> +
> &pm6150_adc {
> charger-thermistor@4f {
> reg = <ADC5_AMUX_THM3_100K_PU>;
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index 6228ba2..05a4133 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -3032,6 +3032,13 @@
> remote-endpoint = <&dsi0_in>;
> };
> };
> +
> + port@2 {
> + reg = <2>;
> + dpu_intf0_out: endpoint {
> + remote-endpoint = <&dp_in>;
> + };
> + };
> };
>
> mdp_opp_table: mdp-opp-table {
> @@ -3148,6 +3155,77 @@
>
> status = "disabled";
> };
> +
> + dp: displayport-controller@ae90000 {

If you label this "mdss_dp", then it will naturally group with other
mdss properties in trogdor.dtsi (which should be sorted alphabetically).

> + compatible = "qcom,sc7180-dp";
> + status = "disabled";
> +
> + reg = <0 0x0ae90000 0 0x1400>;
> +
> + interrupt-parent = <&mdss>;
> + interrupts = <12>;
> +
> + clocks = <&dispcc DISP_CC_MDSS_AHB_CLK>,
> + <&dispcc DISP_CC_MDSS_DP_AUX_CLK>,
> + <&dispcc DISP_CC_MDSS_DP_LINK_CLK>,
> + <&dispcc DISP_CC_MDSS_DP_LINK_INTF_CLK>,
> + <&dispcc DISP_CC_MDSS_DP_PIXEL_CLK>;
> + clock-names = "core_iface", "core_aux", "ctrl_link",
> + "ctrl_link_iface", "stream_pixel";
> + #clock-cells = <1>;
> + assigned-clocks = <&dispcc DISP_CC_MDSS_DP_LINK_CLK_SRC>,
> + <&dispcc DISP_CC_MDSS_DP_PIXEL_CLK_SRC>;
> + assigned-clock-parents = <&dp_phy 0>, <&dp_phy 1>;
> + phys = <&dp_phy>;
> + phy-names = "dp";
> +
> + operating-points-v2 = <&opp_table>;
> + power-domains = <&rpmhpd SC7180_CX>;

Just curious, but isn't the DP block in the MDSS_GDCS? Or do we need to
mention CX here in order for the opp framework to apply required-opps
of CX?

> +
> + #sound-dai-cells = <0>;
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + port@0 {
> + reg = <0>;
> + dp_in: endpoint {
> + remote-endpoint = <&dpu_intf0_out>;
> + };
> + };
> +
> + port@1 {
> + reg = <1>;
> + dp_out: endpoint { };
> + };
> + };
> +
> + opp_table: dp-opp-table {

The one and only "opp_table" of the sc7180 :)
Maybe name it dp_opp_table instead?

Regards,
Bjorn

> + compatible = "operating-points-v2";
> +
> + opp-160000000 {
> + opp-hz = /bits/ 64 <160000000>;
> + required-opps = <&rpmhpd_opp_low_svs>;
> + };
> +
> + opp-270000000 {
> + opp-hz = /bits/ 64 <270000000>;
> + required-opps = <&rpmhpd_opp_svs>;
> + };
> +
> + opp-540000000 {
> + opp-hz = /bits/ 64 <540000000>;
> + required-opps = <&rpmhpd_opp_svs_l1>;
> + };
> +
> + opp-810000000 {
> + opp-hz = /bits/ 64 <810000000>;
> + required-opps = <&rpmhpd_opp_nom>;
> + };
> + };
> + };
> +
> +
> };
>
> dispcc: clock-controller@af00000 {
> --
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