[hisi3559板子问题] 为什么调用HI_MPI_RGN_SetDisplayAttr会造成黑屏

void Hi3559VideoPipeline::UpdateCovers(const std::vector& boxes, HIU32 argb) {
printf(“UpdateCovers=======\n”);
if (!covers_inited) {
printf(“covers not inite\n”);
if (!InitCovers()) return;
}
const int N = coversmax;
const int k = std::min(boxes.size(), N);
printf(“N : %d , k: %d\n”, N, k);

    MPP_CHN_S mpp{};
    mpp.enModId = HI_ID_VO;
    mpp.s32DevId = 0;
    mpp.s32ChnId = 0;


    RGN_CHN_ATTR_S chn_attr{};
    chn_attr.bShow = HI_TRUE;
    chn_attr.enType = COVEREX_RGN;
    chn_attr.unChnAttr.stCoverExChn.u32Layer = 0;
    chn_attr.unChnAttr.stCoverExChn.enCoverType = AREA_QUAD_RANGLE;
    cs_detect_bbox_t r = boxes[0];
    evenize_and_clip_(3840, 2160, r);
    chn_attr.unChnAttr.stCoverExChn.stQuadRangle.stPoint[0] = {r.x, r.y};
    chn_attr.unChnAttr.stCoverExChn.stQuadRangle.stPoint[1] = {r.x + r.w - 2, r.y};
    chn_attr.unChnAttr.stCoverExChn.stQuadRangle.stPoint[2] = {r.x + r.w - 2, r.y + r.h - 2};
    chn_attr.unChnAttr.stCoverExChn.stQuadRangle.stPoint[3] = {r.x, r.y + r.h - 2}; 
    chn_attr.unChnAttr.stCoverExChn.u32Color = argb;
    chn_attr.unChnAttr.stCoverExChn.stQuadRangle.bSolid = HI_FALSE;
    chn_attr.unChnAttr.stCoverExChn.stQuadRangle.u32Thick = 4;

    HI_S32 ret = HI_MPI_RGN_SetDisplayAttr(0, &mpp, &chn_attr);
    if (ret != HI_SUCCESS) printf("[COVER] fail[%d] ret=%#x\n", 0, ret);
    else{
        printf("[COVER] success[%d] ret=%#x\n", 0, ret);
    }

void Hi3559VideoPipeline::HideAllCovers() {
//std::lockguard lk(cover_mtx);
if (!coversinited) return;
for (sizet i = 0; i < cover_handles.size(); ++i) {
RGNCHN_ATTR_S c{};
if (HI_MPI_RGN_GetDisplayAttr(cover_handles[i], &covermpp, &c) != HISUCCESS) continue;
if (c.bShow == HI_FALSE) continue;
c.bShow = HI_FALSE;
HI_MPI_RGN_SetDisplayAttr(cover_handles[i], &covermpp, &c);
}
}调用方式为取视频帧做检测，有框就调用UpdateCovers，没就调用HideAllCovers