RK3288 接PHILIPS 4K显示器HDMI开机概率性不显示的问题
一、测试发现在philips显示器休眠的情况下，rk3288 开机后hmdi无法唤醒显示器。
cat /d/dw-hdmi/status
PHY: disabled
分析后发现是无法打开kernel\drivers\gpu\drm\bridge\synopsys\dw-hdmi.c dw_hdmi_bridge_enable
二、解决方案,检测到无法显示就：
echo off >/sys/devices/platform/display-subsystem/drm/card0/card0-HDMI-A-1/status 关闭
然后 echo detect >/sys/devices/platform/display-subsystem/drm/card0/card0-HDMI-A-1/status 打开
三、具体代码。
diff --git a/device/rockchip/rk3288/init.rk3288.rc b/device/rockchip/rk3288/init.rk3288.rc
index c624b15..a4ba933 100755
--- a/device/rockchip/rk3288/init.rk3288.rc
+++ b/device/rockchip/rk3288/init.rk3288.rc
@@ -47,6 +47,7 @@ on initchown root system /dev/cec0chmod 0664 /dev/cec0
+ chmod 0664 /d/dw-hdmi/statuson verity-loggingexec u:r:slideshow:s0 -- /sbin/slideshow warning/verity_red_1 warning/verity_red_2diff --git a/hardware/rockchip/hwcomposer/hwcomposer.cpp b/hardware/rockchip/hwcomposer/hwcomposer.cpp
index 5dc0ea2..5d0402a 100755
--- a/hardware/rockchip/hwcomposer/hwcomposer.cpp
+++ b/hardware/rockchip/hwcomposer/hwcomposer.cpp
@@ -4258,6 +4258,97 @@ void *invalidate_refresh(void *arg)}#endif
+#define DW_HDMI_STATUS_PATH "/d/dw-hdmi/status"
+
+static bool read_hdmi_status_from_node(const char *path, char *read_buf,unsigned char length)
+{
+ int ret, fd;
+ char statebuf[200];
+ //ALOGI("%s", __FUNCTION__);
+ memset(statebuf, 0, sizeof(statebuf));
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return -ENOENT;
+ ret = read(fd, statebuf, length);
+ close(fd);
+ if (ret < 0) {
+ ALOGE("read hdmi state err\n");
+ return -EINVAL;
+ }
+ memcpy(read_buf,statebuf,length);
+ return 0;
+}
+
+static bool set_hdmi_status(bool hdmi_enable)
+{
+ char acStatus[10];
+ int fd,ret = 0;
+
+ if(hdmi_enable == true)
+ strcpy(acStatus,"detect");
+ else
+ strcpy(acStatus,"off");
+
+ fd = open(HDMI_STATUS_PATH, O_RDWR, 0);
+ if(fd < 0)
+ {
+ ALOGE("Open hdmi_status_fd fail in %s",__FUNCTION__);
+ return 1;
+ }
+ ret = write(fd,acStatus,strlen(acStatus)+1);
+ if(ret < 0)
+ {
+ ALOGE("set hdmi status to %s falied, ret = %d", acStatus, ret);
+ }
+ close(fd);
+ return 0;
+}
+
+void *giada_fix_rk3288_hdmi_display(void *arg)
+{
+ int ret,boot_completed_number=0;
+ char hdmi_status[20],dw_hdmi_status[200];
+ char boot_completed_value[PROPERTY_VALUE_MAX];
+
+ while(true)
+ {
+ property_get( "sys.boot_completed", boot_completed_value, "0");
+ if (!strcmp(boot_completed_value, "1"))
+ {
+ ++boot_completed_number;
+ memset(hdmi_status,0,sizeof(hdmi_status));
+ ret=read_hdmi_status_from_node(HDMI_STATUS_PATH,hdmi_status,sizeof(hdmi_status));
+ if (ret < 0) {
+ ALOGE("read hdmi status\n");
+ }
+ memset(dw_hdmi_status,0,sizeof(dw_hdmi_status));
+ ret=read_hdmi_status_from_node(DW_HDMI_STATUS_PATH,dw_hdmi_status,sizeof(dw_hdmi_status));
+ if (ret < 0) {
+ ALOGE("read dw_hdmi status\n");
+ }
+ ALOGI("**********[%s]**********boot_completed_number=%d boot_completed_value=%s \r\nhdmi status\r\n%s\r\ndw_hdmi_status\r\n%s",__FUNCTION__,boot_completed_number,boot_completed_value,hdmi_status,dw_hdmi_status);
+ if ((!strcmp(hdmi_status, "connected\n"))&&(!strcmp(dw_hdmi_status, "PHY: disabled\n"))&&(boot_completed_number>=10))
+ {
+ system("echo HDMIDISPALYERROR >>/data/hdmi_information_error.txt");
+ ALOGE("########### ERROR:RK3288 HDMI DISPALY IS NOT NORMAL,TRY TO REOPEN IT!###########");
+ set_hdmi_status(false);
+ usleep(1000000);
+ set_hdmi_status(true);
+ }else if ((!strcmp(hdmi_status, "connected\n"))&&(strcmp(dw_hdmi_status, "PHY: disabled\n")))
+ {
+ break;
+ }
+
+ } else
+ ALOGE("********Android System Booting...........!********");
+
+ usleep(1000000);
+ }
+ ALOGI("RK3288 HDMI DISPLAY IS OK NOW!");
+ pthread_exit(NULL);
+ return NULL;
+}
+#if 0
void* hwc_control_3dmode_thread(void *arg){
@@ -4401,6 +4492,13 @@ static int hwc_device_open(const struct hw_module_t *module, const char *name,signal(SIGALRM, hwc_static_screen_opt_handler);#endif+ pthread_t detect_rk3288_dispaly;
+ if (pthread_create(&detect_rk3288_dispaly, NULL, giada_fix_rk3288_hdmi_display, ctx.get()))
+ {
+ ALOGE("Create detect_rk3288_dispaly thread error .");
+ }
+ else
+ ALOGI("Created detect_rk3288_dispaly pthread ");#if 0init_thread_pamaters(&ctx->mControlStereo);ctx->fd_3d = open("/sys/class/display/HDMI/3dmode", O_RDWR, 0);