DRM系列(7)之drmModeAtomicCommit底层流程
应用层实例
首先通过drmModeGetProperty()来获取property的相关信息，然后通过drmModeAtomicAddProperty()来修改property的值，最后通过drmModeAtomicCommit()来发起真正的修改请求。
int main(int argc, char **argv)
{
int fd;
drmModeConnector *conn;
drmModeRes *res;
drmModePlaneRes *plane_res;
drmModeObjectProperties *props;
drmModeAtomicReq *req;
uint32_t conn_id;
uint32_t crtc_id;
uint32_t plane_id;
uint32_t blob_id;
uint32_t property_crtc_id;
uint32_t property_mode_id;
uint32_t property_active;
fd = open("/dev/dri/card0", O_RDWR | O_CLOEXEC);
res = drmModeGetResources(fd);
crtc_id = res->crtcs[0];
conn_id = res->connectors[0];
drmSetClientCap(fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);
plane_res = drmModeGetPlaneResources(fd);
plane_id = plane_res->planes[0];
conn = drmModeGetConnector(fd, conn_id);
buf.width = conn->modes[0].hdisplay;