FbTFT and wrong colors

[st4ck]

Hi, I'm testing a clone of Waveshare 3.5" (A) TFT with the mainline kernel and I've trouble with colors

With legacy kernel works very well until SPI driver hangs (see https://github.com/notro/fbtft/issues/413 for reference) due to a bug

So I've decided to test it with the new kernel

The TFT is attached on SPI1 and I'm able to correctly load fbtft_device (with ILI9486) and I'm able to start xorg, executing SDL & GLX application

But all the colors are wrong. I've also tested bgr or mode args during modprobe without any results

I attach a photo of the display running glxgears with kernel module loaded as follow

modprobe fbtft_device custom name=fb_ili9486 buswidth=8 gpios=dc:18,reset:2 speed=16000000 busnum=1 rotate=0 width=320 height=480

Any suggestion?

 

PS original glxgears colors

[A-P]

Lowering the speed to 8000000 made it better for me but it still freezes.

Using dietpi (originally armbian but lighter) reduced the frequency for me. (but not fixed the problem)

I saw that you've sent a bug report to notro about the problem. Please keep us updated if you received any reply.

Regards.

[st4ck]

I tried to recompile fbtft changing colors and making same changes, without lucky. I think It's a kernel problem (spi module) and I don't see any solution by now. I'll keep you updated if there are positive news.

By the way, on raspberry pi zero the same screen works like a charm up to 48mhz giving me real 60fps with same release of fbtft drivers

[Blast]

You need to add bgr=1 to your setup line I guess. Switches the signal to colors.

 

Edit: I need to read better, didn't see you had tried bgr etc... Sorry.