Difference between revisions of "EDP"

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(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...")
 
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=== * How to Enable eDP Module ===
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= References =
  
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----
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[https://github.com/rockchip-linux/kernel/tree/release-4.4/drivers/gpu/drm/rockchip source code]
  
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'''1. Driver Compile'''<br/> Ensure below configures have been selected:
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[https://github.com/rockchip-linux/kernel/blob/release-4.4/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt device-tree document]
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<pre><code>CONFIG_ROCKCHIP_ANALOGIX_DP=y
 
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CONFIG_PHY_ROCKCHIP_DP=y</code>
 
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</pre>
 
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Bellow drivers have been compiled:
 
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<pre><code>drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
 
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drivers/gpu/drm/bridge/analogix/</code>
 
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</pre>
 
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'''2. DTS Setting'''<br/> 2.1 Enable eDP Device Node：
 
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*Include the SoC DTS 'rk3288.dtsi' file.  
 
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*Set the eDP device node state to 'okay'.
 
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*Set the eDP-PHY device node state to 'okay'.
 
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<pre><code>include "rk3288.dtsi"
 
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&edp {
 
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        status = "okay";
 
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};
 
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&edp_phy {
 
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        status = "okay";
 
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};</code>
 
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</pre>
 
  
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2.2 eDP device node parameters, there are two properties for eDP device:
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&nbsp;
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<pre><code>force-hpd;
 
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ports {
 
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        edp_out: port@1 {
 
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                reg = <1>;
 
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                #address-cells = <1>;
 
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                #size-cells = <0>;
 
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                edp_out_panel: endpoint {
 
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                        reg = <0>;
 
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                        remote-endpoint = <&panel_in_edp>;
 
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                };
 
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        };
 
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};</code>
 
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</pre>
 
  
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*"force-hpd": forcing regard panel is connected for some panel without Hotplug pin.
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= Tips =
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*"ports": pointed to panel device node
 
  
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----
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== '''Whether eDP display card has been registered successfully''' ==
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=== * How To Debug eDP Module ===
 
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'''3. Whether eDP display card has been registered successfully'''
 
  
 
If the eDP display card has been created, it would create a sysfs debug directory.
 
If the eDP display card has been created, it would create a sysfs debug directory.
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*Check the kernel log for more detail (dmesg | grep dp)  
 
*Check the kernel log for more detail (dmesg | grep dp)  
  
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'''4. Check eDP display card status: status, enabled, modes'''
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== '''Check eDP display card status: status, enabled, modes''' ==
 
<pre><code>$ cd /sys/class/drm/card0-eDP-1
 
<pre><code>$ cd /sys/class/drm/card0-eDP-1
 
$ cat status  # should printed connected or disconnected
 
$ cat status  # should printed connected or disconnected
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</pre>
 
</pre>
  
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'''5. If you still have no picture on eDP panel, please check bellow information:'''
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== '''If you still have no picture on eDP panel, please check bellow information:''' ==
  
 
*Check the eDP panel power supply.  
 
*Check the eDP panel power supply.  
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*Check the hardware connected status, or test the panel on workable board.  
 
*Check the hardware connected status, or test the panel on workable board.  
  
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----
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=== &nbsp; ===
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=== * Reference eDP DTS Configure： ===
 
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<pre><code>include "rk3288.dtsi"
 
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edp_panel: edp-panel {
 
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        compatible ="lg,lp079qx1-sp0v", "simple-panel";
 
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        backlight = <&backlight>;
 
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        enable-gpios = <&gpio7 4 GPIO_ACTIVE_HIGH>;
 
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        pinctrl-0 = <&lcd_cs>;
 
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        ports {
 
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                panel_in: port {
 
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                        panel_in_edp: endpoint {
 
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                                remote-endpoint = <&edp_out_panel>;
 
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                        };
 
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                };
 
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        };
 
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};
 
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&edp {
 
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        force-hpd;
 
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        status = "okay";
 
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        ports {
 
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                edp_out: port@1 {
 
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                        reg = <1>;
 
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                        #address-cells = <1>;
 
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                        #size-cells = <0>;
 
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                        edp_out_panel: endpoint {
 
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                                reg = <0>;
 
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                                remote-endpoint = <&panel_in_edp>;
 
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                        };
 
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                };
 
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        };
 
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};
 
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&edp_phy {
 
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        status = "okay";
 
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};</code></pre>
 

Revision as of 02:46, 11 October 2017

References

source code

device-tree document

 

Tips

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)

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>

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.

 

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