非Atomic的参数操作

  1. struct drm_mode_obj_set_property {
  2.     __u64 value;
  3.     __u32 prop_id;
  4.     __u32 obj_id;
  5.     __u32 obj_type;
  6. };
  7. parse_property(&prop_args[prop_count], optarg); // 获取 prop的prop_id 和 value
  8. drmModeObjectSetProperty
  9.     find_object(....); // 在资源表去匹配prop_id，来 获取 obj_type 是  crtc? connector? plane
  10.     DRM_IOCTL(fd, DRM_IOCTL_MODE_OBJ_SETPROPERTY, &prop);
  12. drm_mode_obj_set_property_ioctl
  13.     drm_mode_object_find  // 去drm_dev->mode_config 里边查找并获取 obj_id
  14.     drm_mode_obj_find_prop_id // 在当前obj的属性列表中查找要选择的属性
  15.     set_property_atomic // 这里使用atomic来设置属性
  16.         drm_atomic_state_alloc  // 分配一个新的 struct drm_atomic_state *state;
  17.         drm_atomic_set_property
  18.             drm_atomic_get_plane_state
  19.                 drm_atomic_get_existing_plane_state
  20.                 drm_modeset_lock
  21.                 plane->funcs->atomic_duplicate_state(plane);
  22.             drm_atomic_plane_set_property  // !!! 设置属性
  23.         drm_atomic_commit
  24.             drm_atomic_check_only
  25.                 drm_atomic_plane_check
  26.                 ret = config->funcs->atomic_check(state->dev, state);
  27.             config->funcs->atomic_commit(state->dev, state, false);  // malidp_mode_config_funcs.drm_atomic_helper_commit
  30.             commit_work
  31.                 commit_tail(state);
  32.                     // mali-dp550 : drm->mode_config.helper_private = &malidp_mode_config_helpers;
  33.                     funcs = dev->mode_config.helper_private;
  34.                     funcs->atomic_commit_tail(old_state); or  drm_atomic_helper_commit_tail(old_state);
  35.                         malidp_atomic_commit_tail
  36.                             drm_atomic_helper_commit_planes
  37.                                 funcs = plane->helper_private;  // malidp_de_plane_helper_funcs
  38.                                 funcs->atomic_update(plane, old_plane_state);  // !!!!!!! 总算找到了

set_property_atomic 里边的 DPMS是什么？ // TBD

  1. set_property_atomic  // 在 malidp_init 里边未初始化 mode_config.dpms_property ,这个好像是 控制连接器DPMS状态的默认连接器属性。
  2.                      // 显示器电源管理标准 (DPMS)提供显示器电源管理功能； //这里先不考虑

几个特别重要的接口：

  1. static const struct drm_mode_config_funcs malidp_mode_config_funcs = {
  2.     .fb_create = malidp_fb_create,
  3.     .atomic_check = drm_atomic_helper_check,
  4.     .atomic_commit = drm_atomic_helper_commit,
  5. };
  6. drm->mode_config.funcs = &malidp_mode_config_funcs;
  7. drm->mode_config.helper_private = &malidp_mode_config_helpers;
  10. static const struct drm_plane_funcs malidp_de_plane_funcs = {
  11.     .update_plane = drm_atomic_helper_update_plane,
  12.     .disable_plane = drm_atomic_helper_disable_plane,
  13.     .destroy = malidp_de_plane_destroy,
  14.     .reset = malidp_plane_reset,
  15.     .atomic_duplicate_state = malidp_duplicate_plane_state,
  16.     .atomic_destroy_state = malidp_destroy_plane_state,
  17.     .atomic_print_state = malidp_plane_atomic_print_state,
  18.     .format_mod_supported = malidp_format_mod_supported_per_plane,
  19. };
  20. plane->funcs = malidp_de_plane_funcs;
  21. plane->helper_private = malidp_de_plane_helper_funcs

Atomic的代码流程