Android [QCOM-MSM8916][CM12.1]如何注册正确的帧缓冲区节点？（fb0/1/2）

我现在是三星Galaxy J5的开发者

• 芯片组：高通公司MSM8916 Snapdragon 410
• CPU：四核1.2 GHz Cortex-A53
• GPU：肾上腺306

在/hardware/qcom/display caf/msm8916/libqdutils中，有相应的文件（qd_utils.cpp）通过msm_fb_类型声明帧缓冲区节点

#include "qd_utils.h"
#define QD_UTILS_DEBUG 0

namespace qdutils {

int getHDMINode(void)
{
    FILE *displayDeviceFP = NULL;
    char fbType[MAX_FRAME_BUFFER_NAME_SIZE];
    char msmFbTypePath[MAX_FRAME_BUFFER_NAME_SIZE];
    int j = 0;

    for(j = 0; j < HWC_NUM_DISPLAY_TYPES; j++) {
        snprintf (msmFbTypePath, sizeof(msmFbTypePath),
                  "/sys/class/graphics/fb%d/msm_fb_type", j);
        displayDeviceFP = fopen(msmFbTypePath, "r");
        if(displayDeviceFP) {
            fread(fbType, sizeof(char), MAX_FRAME_BUFFER_NAME_SIZE,
                    displayDeviceFP);
            if(strncmp(fbType, "dtv panel", strlen("dtv panel")) == 0) {
                ALOGD("%s: HDMI is at fb%d", __func__, j);
                fclose(displayDeviceFP);
                break;
            }
            fclose(displayDeviceFP);
        } else {
            ALOGE("%s: Failed to open fb node %d", __func__, j);
        }
    }

    if (j < HWC_NUM_DISPLAY_TYPES)
        return j;
    else
        ALOGE("%s: Failed to find HDMI node", __func__);

关于如何禁用/dev/fb2节点搜索，或者在内核/设备树中包含此功能，有什么想法吗？一些开发人员说，当按下电源键时，缺少节点会导致屏幕启用/禁用延迟，所以我猜这是一个bug

来源

E/qdutils (  269): int qdutils::getHDMINode(): Failed to open fb node 2
E/qdutils (  269): int qdutils::getHDMINode(): Failed to find HDMI node