Difference between revisions of "LVDS"
From Rockchip open source Document
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If the LVDS display card has been created, it would create a sysfs debug directory. | If the LVDS display card has been created, it would create a sysfs debug directory. | ||
| − | <pre | + | <pre>$ ls /sys/class/drm/card0-LVDS-1</code> |
</pre> | </pre> | ||
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== Check LVDS display card status: status, enabled, modes == | == Check LVDS display card status: status, enabled, modes == | ||
| − | <pre | + | <pre>$ cd /sys/class/drm/card0-LVDS-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" | ||
| Line 34: | Line 34: | ||
*Check the LVDS panel power supply. | *Check the LVDS panel power supply. | ||
*Check the panel datasheet, ensure you have configured the timing and data format rightly. | *Check the panel datasheet, ensure you have configured the timing and data format rightly. | ||
| − | *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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Latest revision as of 07:37, 11 October 2017
Contents
References
Tips
Whether LVDS display card has been registered successfully
If the LVDS display card has been created, it would create a sysfs debug directory.
$ ls /sys/class/drm/card0-LVDS-1</code>
So you just need to check that directory. If that directory is missing in your machine board, please check:
- Whether LVDS have been enabled in DTS files.
- Whether LVDS panel have been registered successfully.
- Whether you have available VOP module for LVDS.
- Check the kernel log for more detail (dmesg | grep lvds)
Check LVDS display card status: status, enabled, modes
$ cd /sys/class/drm/card0-LVDS-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 LVDS panel, please check bellow information:
- Check the LVDS panel power supply.
- Check the panel datasheet, ensure you have configured the timing and data format rightly.
- Check the hardware connected status, or test the panel on workable board.
