IMX8MM + sn65dsi83 + yocto scarthgap = devicetree problem

[pavelko]

Hello,

back to 4.19 warrior I have used this configuration of sn65dsi84 DSI to LVDS bridge in device tree:

&i2c1 {
  clock-frequency = <400000>;
  pinctrl-names = "default";
  pinctrl-0 = <&pinctrl_i2c1>;
  status = "okay";

  dsi_lvds_bridge: sn65dsi84@2c {
    compatible = "ti,sn65dsi83";
    reg = <0x2c>;
    ti,dsi-lanes = <4>;
    ti,lvds-format = <2>;
    ti,lvds-channels = <1>;
    ti,lvds-bpp = <24>;
    ti,width-mm = <210>;
    ti,height-mm = <157>;
    ti,burst-mode;
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_lvds>;
    enable-gpios = <&gpio1 12 GPIO_ACTIVE_HIGH>;
    status = "okay";

    display-timings {
      lvds {
        clock-frequency = <65000000>;
        hactive = <1024>;
        vactive = <768>;
        /* */
        hfront-porch = <24>;
        hsync-len = <136>;
        hback-porch = <160>;
        /* */
        vfront-porch = <3>;
        vsync-len = <6>;
        vback-porch = <29>;
        /* */
        vsync-active = <0>;
        hsync-active = <0>;
        de-active = <1>;
        pixelclk-active = <1>;
     };
  };

  port {
    lvds_from_dsi: endpoint {
      remote-endpoint = <&dsi_to_lvds>;
    };
  };
};
};

&mipi_dsi {
  status = "okay";

  port@1 {
    dsi_to_lvds: endpoint {
      remote-endpoint = <&lvds_from_dsi>;
    };
  };
};

&iomuxc {
  pinctrl_i2c1: i2c1grp {
    fsl,pins = <
      MX8MM_IOMUXC_I2C1_SCL_I2C1_SCL 0x400001c3
      MX8MM_IOMUXC_I2C1_SDA_I2C1_SDA 0x400001c3
    >;
  };

  pinctrl_lvds: lvdsgrp {
    fsl,pins = <
      MX8MM_IOMUXC_GPIO1_IO12_GPIO1_IO12 0x16
    >;
  };
};

However, when I ported the device tree to yocto scarthgap (Linux 6.6) this definition is not working anymore:

[ 1.290572] imx-drm display-subsystem: bound imx-lcdif-crtc.0 (ops lcdif_crtc_ops)
[ 1.298317] imx_sec_dsim_drv 32e10000.mipi_dsi: version number is 0x1060200
[ 1.305343] [drm:drm_bridge_attach] *ERROR* failed to attach bridge /soc@0/bus@32c00000/mipi_dsi@32e10000 to encoder DSI-34: -19
[ 1.316955] imx_sec_dsim_drv 32e10000.mipi_dsi: Failed to attach bridge: 32e10000.mipi_dsi
[ 1.325231] imx_sec_dsim_drv 32e10000.mipi_dsi: failed to bind sec dsim bridge: -19
[ 1.332903] imx-drm display-subsystem: bound 32e10000.mipi_dsi (ops imx_sec_dsim_ops)
[ 1.341048] [drm] Initialized imx-drm 1.0.0 20120507 for display-subsystem on minor 0
[ 1.348908] imx-drm display-subsystem: [drm] Cannot find any crtc or sizes

Could anyone point me an example device tree setup for sn65dsi8(3/4/5) + imx8mm + Linux 6.6

Thanks in advance.

[pavelko]

Thank you for your solution!

Best Regards,

Pavel

[pavelko]

Thank you for the answer.

To accept it as an answer "port 1" in sn65dsi declaration shall be renamed to "port 2", as port 1 is used foe 2nd DSI output channel. and correct reg =<1> to reg=<2> accordingly.

Thank you!

[Manuel_Salas]

Hello @pavelko 

I updated the post, please check it, also, thank you for the feedback!

Best regards,

Salas.

[Manuel_Salas · Accepted solution]

Hello @pavelko 

I hope you are doing very well.

You can take a look into the sn65dsi83 binding in the linux kernel.

Also, you can try with this modified device tree:

&i2c1 {
    clock-frequency = <400000>;
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_i2c1>;
    status = "okay";

    dsi_lvds_bridge: sn65dsi84@2c {
        compatible = "ti,sn65dsi83";
        reg = <0x2c>;
        enable-gpios = <&gpio1 12 GPIO_ACTIVE_HIGH>;
        status = "okay";

        ports {
            #address-cells = <1>;
            #size-cells = <0>;

            port@0 {
                reg = <0>;
                bridge_in: endpoint {
                    remote-endpoint = <&mipi_dsi_out>;
                    data-lanes = <1 2 3 4>;
                };
            };

            port@2 {
                reg = <2>;
                bridge_out: endpoint {
                    remote-endpoint = <&panel_in>;
                };
            };
        };
    };
};

&mipi_dsi {
    status = "okay";

    port@1 {
        reg = <1>;
        mipi_dsi_out: endpoint {
            remote-endpoint = <&bridge_in>;
            data-lanes = <1 2 3 4>;
        };
    };
};

panel_lvds: panel {
    compatible = "panel-lvds";
    data-mapping = "jeida-24";
    width-mm = <210>;
    height-mm = <157>;

    panel-timing {
        clock-frequency = <65000000>;
        hactive = <1024>;
        vactive = <768>;
        hfront-porch = <24>;
        hsync-len = <136>;
        hback-porch = <160>;
        vfront-porch = <3>;
        vsync-len = <6>;
        vback-porch = <29>;
        hsync-active = <0>;
        vsync-active = <0>;
        de-active = <1>;
        pixelclk-active = <1>;
    };

    port {
        panel_in: endpoint {
            remote-endpoint = <&bridge_out>;
        };
    };
};

It should align with the 6.6 kernel version.

Best regards,

Salas.