drm mode fails to draw on H616 processor

[danielwalton]

I can't get drm mode to work within lvgl on my SBC (Orange Pi Zero 2).

This example works fine:
https://github.com/dvdhrm/docs/blob/master/drm-howto/modeset-atomic.c

However only fbdev seems to work with lvgl.

Here is how I'm initializing it. The screen flashes, then I'm back in the console.

` drm_init();
lv_disp_draw_buf_init(&disp_buf, buf, buf2, DISP_BUF_SIZE);

/*Initialize and register a display driver*/
disp_drv.draw_buf = &disp_buf;
disp_drv.flush_cb = drm_flush;
disp_drv.hor_res = 800;
disp_drv.ver_res = 480;
disp_drv.full_refresh = true;
lv_disp_drv_register(&disp_drv);`

[kisvegabor]

I cc @superna9999 and @leiflm who contributed the DRM driver.
Could you take lake look at this issue?

[leiflm]

I am sorry. I am currently not using lvgl.

Maybe using DRM environment variables to debug will help you to find precisely what goes wrong.

@danielwalton In case you are addressing the wrong device, you can use the environment variable DRM_CARD to specify a different one.

Good luck!

[stale]

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