[meta-ti] Weston not starting up with SGX drivers on BeagleBone Black

[Yury Luneff]

Hello!

I’m trying to get Weston running on BeagleBone Black with TI’s SGX drivers. Kernel is 4.9.13-g102f61776e from meta-ti (morty branch) and the drivers alike.
I have Weston 1.11 with patches from meta-arago (the patch that forces using card0 whereas I have card0 for tilcdc and card1 for pvrsrvkm plus the Mesa/GBM dealing patch). I had it running with SGX drivers already, but all of a sudden it ceased to startup properly.

# weston --tty=1 -B drm-backend.so --current-mode
…
[16:07:05.845] Output HDMI-A-1, (connector 26, crtc 24)
               mode 1360x768 at 60.4, preferred, current
...
[16:07:05.957] set mode failed: Invalid argument

I’ve posted complete Weston startup log here: http://pastebin.com/bHbdDMas

The failure reason is listed in dmesg log:
tilcdc 4830e000.lcdc: Invalid pitch: fb and crtc widths must be the same

I see the patch comments in https://patchwork.kernel.org/patch/7856821/ that introduced this sanity check for tilcdc, but I’m not sure how to achieve proper setup with my case.

I have put 'gbm-format=rgb565’ in /etc/weston.ini. tilcdc’s pixel format seems to be the same: /sys/bus/platform/drivers/tilcdc/4830e000.lcdc/graphics/fb0/bits_per_pixel equals to 16.

I’m not sure how tilcdc and pvrsrvkm should work between each other but the result is weston/wayland not starting because of some framebuffer mode conflict.

I had it working very little time ago and I did it by specifying --current-mode for Weston, but now this option doesn’t help as Weston tries to set_mode anyway.

Please, give me an advice on how to debug this.

Thanks!
—
Yury Lunev