EDP - Revision history

Jacob at 07:37, 11 October 2017

2017-10-11T07:37:02Z

Jacob at 02:47, 11 October 2017

2017-10-11T02:47:21Z

Jacob at 02:46, 11 October 2017

2017-10-11T02:46:54Z

Jacob: Created page with " === * How to Enable eDP Module === ---- '''1. Driver Compile'''
Ensure below configures have been selected:

CONFIG_ROCKCHIP_ANALOGIX_DP=y CONFIG_PHY_ROCKCHI..."


2017-10-11T02:31:21Z
Created page with " === * How to Enable eDP Module ===  ----  '''1. Driver Compile'''<br/> Ensure below configures have been selected: <pre><code>CONFIG_ROCKCHIP_ANALOGIX_DP=y CONFIG_PHY_ROCKCHI..."
New page


=== * How to Enable eDP Module ===



----



'''1. Driver Compile'''<br/> Ensure below configures have been selected:

<pre><code>CONFIG_ROCKCHIP_ANALOGIX_DP=y

CONFIG_PHY_ROCKCHIP_DP=y</code>

</pre>



Bellow drivers have been compiled:

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

drivers/gpu/drm/bridge/analogix/</code>

</pre>



'''2. DTS Setting'''<br/> 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'. 

<pre><code>include "rk3288.dtsi"

&edp {

        status = "okay";

};



&edp_phy {

        status = "okay";

};</code>

</pre>



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

<pre><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>

</pre>



*"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.

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

</pre>



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'''

<pre><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>

</pre>



'''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： ===

<pre><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></pre>

EDP - Revision history

Jacob at 07:37, 11 October 2017

Jacob at 02:47, 11 October 2017

Jacob at 02:46, 11 October 2017

Jacob: Created page with " === * How to Enable eDP Module === ---- '''1. Driver Compile''' Ensure below configures have been selected: CONFIG_ROCKCHIP_ANALOGIX_DP=y CONFIG_PHY_ROCKCHI..."

Jacob: Created page with " === * How to Enable eDP Module === ---- '''1. Driver Compile'''
Ensure below configures have been selected:
`CONFIG_ROCKCHIP_ANALOGIX_DP=y CONFIG_PHY_ROCKCHI..."`