Any way to swap parallel LCD data pin color mapping?

[dluberger]

After much digging around through my schematics, the LCD manufacturer's schematics, and comparison with the eval board reference design, I came to realize that my custom board has the LCD red and blue lines swapped (i.e., on the reference design, Blue is D0 thru D7and Red is D16 thru D23, but I accidentally set Red to D0 thru D7 in my LCD connections).

Is there any way to redefine the eLCDIF module data bit mapping?  I can't do it in the device tree because the pin mux doesn't allow for that.  Basically for anything accessing the framebuffer or LCD peripheral, I want red data to be swapped with blue and vice versa.  Eventually I'll do a new run of my board, but in the meantime I'd like to know if this is possible.

[jimmychan]

Could you tell me which BSP are you using？

[dluberger]

I'm not sure what you're asking (i'm not entirely sure how i tell which bsp i'm using as i don't know what the bsp actually is).  I configured yocto to use the 4.9.11 Kernel, and it's the "morty" branch of the yocto project.

[jimmychan]

BSP is Board Support Package. You can find the i.MX BSP from this web page i.MX Software|NXP .

I think you are using the Linux BSP 4.9.11.

Attached is the Linux Reference Manual. For the details of ELCDIF, please read the Chapter 6.2.6.2.

You may try to modify the driver source code mxsfb.c to swap the color.

[dluberger · Accepted solution]

Thanks.  I've decided to leave things as they are and incorporate the pinout change in the next board revision.