EDP

* How to Enable eDP Module

---

1. Driver Compile
Ensure below configures have been selected:

<code>CONFIG_ROCKCHIP_ANALOGIX_DP=y
CONFIG_PHY_ROCKCHIP_DP=y</code>

Bellow drivers have been compiled:

<code>drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
drivers/gpu/drm/bridge/analogix/</code>

2. DTS Setting
2.1 Enable eDP Device Node：

• Include the SoC DTS 'rk3288.dtsi' file.
• Set the eDP device node state to 'okay'.
• Set the eDP-PHY device node state to 'okay'.

<code>include "rk3288.dtsi"
&edp {
        status = "okay";
};

&edp_phy {
        status = "okay";
};</code>

2.2 eDP device node parameters, there are two properties for eDP device:

<code>force-hpd;
ports {
        edp_out: port@1 {
                reg = <1>;
                #address-cells = <1>;
                #size-cells = <0>;
                edp_out_panel: endpoint {
                        reg = <0>;
                        remote-endpoint = <&panel_in_edp>;
                };
        };
};</code>

• "force-hpd": forcing regard panel is connected for some panel without Hotplug pin.
• "ports": pointed to panel device node

---

* How To Debug eDP Module

3. Whether eDP display card has been registered successfully

If the eDP display card has been created, it would create a sysfs debug directory.

<code>$ ls /sys/class/drm/card0-eDP-1</code>

So you just need to check that directory. If that directory is missing in your machine board, please check:

• Whether eDP & eDP-PHY have been enabled in DTS files.
• Whether eDP panel have been registered successfully.
• Whether you have available VOP module for eDP.
• Check the kernel log for more detail (dmesg | grep dp)

4. Check eDP display card status: status, enabled, modes

<code>$ cd /sys/class/drm/card0-eDP-1
$ cat status  # should printed connected or disconnected
$ cat enabled # should printed enabled or disabled
$ cat modes   # should printed the available mode list, like 1536x2048</code>

5. If you still have no picture on eDP panel, please check bellow information:

• Check the eDP panel power supply.
• Check the panel datasheet, ensure you have configured the timing and power sequence rightly.
• Check the hardware connected status, or test the panel on workable board.

---

* Reference eDP DTS Configure：

<code>include "rk3288.dtsi"

edp_panel: edp-panel {
        compatible ="lg,lp079qx1-sp0v", "simple-panel";
        backlight = <&backlight>;
        enable-gpios = <&gpio7 4 GPIO_ACTIVE_HIGH>;
        pinctrl-0 = <&lcd_cs>;
        ports {
                panel_in: port {
                        panel_in_edp: endpoint {
                                remote-endpoint = <&edp_out_panel>;
                        };
                };
        };
};

&edp {
        force-hpd;
        status = "okay";

        ports {
                edp_out: port@1 {
                        reg = <1>;
                        #address-cells = <1>;
                        #size-cells = <0>;
                        edp_out_panel: endpoint {
                                reg = <0>;
                                remote-endpoint = <&panel_in_edp>;
                        };
                };
        };
};

&edp_phy {
        status = "okay";
};</code>