资源枚举

plane资源

  1. root@inno-MS-7B89:busybox# modetest -p
  2. Planes:
  3. id    crtc    fb    CRTC x,y    x,y    gamma size    possible crtcs
  4. 41    51    97    0,0        0,0    0           0x00000001
  5.   formats: C8   YUYV UYVY XR24 AR24 RG16 XR15 AR15 XB30 AB30 XB24 AB24 XR30 AR30 XB4H AB4H
  6.   props:
  7.     8 type:
  8.         flags: immutable enum
  9.         enums: Overlay=0 Primary=1 Cursor=2
  10.         value: 1
  11.     42 zpos:
  12.         flags: range
  13.         values: 0 254
  14.         value: 0
  15.     43 alpha:
  16.         flags: range
  17.         values: 0 65535
  18.         value: 65535
  19.     44 pixel blend mode:
  20.         flags: enum
  21.         enums: None=2 Pre-multiplied=0 Coverage=1
  22.         value: 0
  23. ......

代码分析 modetest.c中

  1. drmModeGetPlaneResources(dev->fd)    // 获取资源总数
  2.     DRM_IOCTL_MODE_GETPLANERESOURCES => drm_mode_getplane_res => mode_config.plane_list
  3. drmModeGetPlane    // 对每一个资源，获取详细信息
  4.     DRM_IOCTL_MODE_GETPLANE => drm_mode_getplane => 
  6. drmModeObjectGetProperties
  7.     DRM_IOCTL_MODE_OBJ_GETPROPERTIES
  8. drmModeGetProperty
  9.     DRM_IOCTL_MODE_GETPROPERTY