RV1106 (ultra w) LVGL + DRM

• RomkaAmigo

  Posts: 6

  Joined: 2026-01-24 7:46

  2026-01-24 7:58

  Hi i trying to use DRM with LVGL 8.3.10. It forks well with fb0 output, but with DRM i have an error:

  drm: Found plane_id: 55 connector_id: 70 crtc_id: 66
  drm: 800x480 (85mm X 85mm) pixel format XR24
  size 1536000 pitch 3200 offset 268435456
  size 1536000 pitch 3200 offset 269971456
  DRM subsystem and buffer mapped successfully
  error: drmModeAtomicCommit failed: Permission denied
  error: Flush fail

  DRM is enabled in kernel.
  DRM_ROCKCHIP [=y]
  
  Permissions:
  ls -l /dev/dri/
  total 0
  drwxr-xr-x 2 root root 80 Jan 24 07:22 by-path
  crw-rw-rw- 1 root video 226, 0 Jan 24 07:22 card0
  crw-rw-rw- 1 root video 226, 128 Jan 24 07:22 renderD128
  
  I add for lvgl

  Code: Select all

      #  define USE_DRM           1
      lv_init();
      /*Linux FrameBuffer or DRM device init*/
      #if (USE_DRM == 1)
          drm_init();
      #elif (USE_FBDEV == 1)
          fbdev_init();
      #endif
      static lv_disp_draw_buf_t disp_buf;
      lv_disp_draw_buf_init(&disp_buf, buf0, buf1, DISP_SIZE);
  
      static lv_disp_drv_t disp_drv;
      lv_disp_drv_init(&disp_drv);
      disp_drv.draw_buf   = &disp_buf;
      #if (USE_DRM == 1)
          disp_drv.flush_cb   = drm_flush;
      #elif (USE_FBDEV == 1)
          disp_drv.flush_cb   = fbdev_flush; 
      #endif
  ...
  

  Whats wrong and what i should do else?

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