WhyCan Forum(哇酷开发者社区)

内核和设备树配置

Device Drivers -> SUNXI G2D Driver -> sunxi g2d ratate module
Device Drivers -> Graphics support -> Frame buffer Devices -> DISP2 Framebuffer rotation support -> Hardware(G2D) rotation support

设备树

    disp_rotation_used       = <1>;
    degree0                    = <3>;   // 1,2,3

    fb0_format               = <0>;
    fb0_width                = <800>; 
    fb0_height               = <480>;

修改qt源码重新编译:
qlinuxfbscreen.cpp里面QRegion QLinuxFbScreen::doRedraw()
调用FBIOPAN_DISPLAY，相当于调用内核G2D函数; 添加代码如下
------------
struct fb_var_screeninfo vinfo;
if(ioctl(fp, FBIOGET_VSCREENINFO, &vinfo)){
printf("Error reading variable information/n");
exit(3);
}
ioctl(fbfd, FBIOPAN_DISPLAY, &vinfo);   
---------------

其他参考
https://www.cnblogs.com/liamyi/p/18539667
https://www.cnblogs.com/hylife/p/17496308.html

感谢，晕哥回复；大致采用这个方案！