I have an LVDS display connected to an Ixora board with an Apalis module. The display is 800x480 @ 24-bits, and from the datasheet I can tell is expects LVDS data in the SPWG format.
Now I do get a legible image on the display, but it looks “washed out”/extremely low contract, i.e. anything that should be black looks gray. I also see colors that look like the RGB components overflowed (banding, instead of a smooth color gradient). See the pictures below for examples (the photo of the text may seem like it’s just a bad picture, but that is really what it looks like).
Could these effects be caused by an incorrect colour mapping? The LVDS section of the Apalis iMX6 datasheet mentions an LDB Control Register and the bit_mapping_ch and data_width_ch fields where you can select the JEIDA or SPWG color mappings. How can I check which mapping is used?
In u-boot, my vidargs are set to:
uname -a says:
Linux apalis-imx6 4.1.41-2.7.3+g82f0f4f #2 SMP Fri Jul 28 12:39:57 CEST 2017 armv7l GNU/Linux
Any suggestions are appreciated.