From 201a57440c135c23cb71f7041ff8fc3f4580f282 Mon Sep 17 00:00:00 2001
From: jianglianfang <jianglianfang@xiaomi.com>
Date: Tue, 22 Aug 2023 15:12:26 +0800
Subject: [PATCH] system/nxcamera: add pan_display when it is not single
 buffer.

After optimizing the vync mechanism, it is necessary to use ioctl (display) to refresh the display in dual buffer mode.

run nxcamera.

Signed-off-by: jianglianfang <jianglianfang@xiaomi.com>
---
 system/nxcamera/nxcamera.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/system/nxcamera/nxcamera.c b/system/nxcamera/nxcamera.c
index 006a899be..ed68caf53 100644
--- a/system/nxcamera/nxcamera.c
+++ b/system/nxcamera/nxcamera.c
@@ -36,6 +36,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <poll.h>
 
 #include <nuttx/queue.h>
 #include <nuttx/video/video.h>
@@ -64,6 +65,25 @@
  * Private Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * pan_display
+ ****************************************************************************/
+
+static void pan_display(int fb_device, FAR struct fb_planeinfo_s *plane_info)
+{
+  struct pollfd pfd;
+  int ret;
+  pfd.fd = fb_device;
+  pfd.events = POLLOUT;
+
+  ret = poll(&pfd, 1, 0);
+
+  if (ret > 0)
+    {
+      ioctl(fb_device, FBIOPAN_DISPLAY, plane_info);
+    }
+}
+
 static int show_image(FAR struct nxcamera_s *pcam, FAR v4l2_buffer_t *buf)
 {
 #ifdef CONFIG_LIBYUV
@@ -381,6 +401,11 @@ static void *nxcamera_loopthread(pthread_addr_t pvarg)
           goto err_out;
         }
 
+      if (pcam->display_pinfo.yres_virtual > pcam->display_vinfo.yres)
+        {
+          pan_display(pcam->display_fd, &pcam->display_pinfo);
+        }
+
       ret = ioctl(pcam->capture_fd, VIDIOC_QBUF, (uintptr_t)&buf);
       if (ret < 0)
         {