Difference between revisions of "EDP"
From Rockchip open source Document
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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. | ||
| − | <pre | + | <pre>$ ls /sys/class/drm/card0-eDP-1</code> |
</pre> | </pre> | ||
| Line 24: | Line 24: | ||
== '''Check eDP display card status: status, enabled, modes''' == | == '''Check eDP display card status: status, enabled, modes''' == | ||
| − | <pre | + | <pre>$ cd /sys/class/drm/card0-eDP-1 |
$ cat status # should printed connected or disconnected | $ cat status # should printed connected or disconnected | ||
$ cat enabled # should printed enabled or disabled | $ cat enabled # should printed enabled or disabled | ||
| − | $ cat modes # should printed the available mode list, like 1536x2048 | + | $ cat modes # should printed the available mode list, like 1536x2048 |
</pre> | </pre> | ||
Latest revision as of 07:37, 11 October 2017
Contents
References
Tips
Whether eDP display card has been registered successfully
If the eDP display card has been created, it would create a sysfs debug directory.
$ 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
$ 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
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.
