libcamera: touch-to-focus fixes

- Do not send command to camera unless preview is started
  (fix 4.3 AOSP camera crash)
- Send touch AF command regardless of previous state
  (required to actually trigger touch AF at the new area)

Change-Id: I51a8f80ce1ec38f1052e4660f708be8649478a88

libcamera/SecCamera.cpp

@@ -2357,7 +2357,8 @@ int SecCamera::setTouchAFStartStop(int start_stop)
 {
     ALOGV("%s(touch_af_start_stop (%d))", __func__, start_stop);
 
-    if (m_touch_af_start_stop != start_stop) {
+    if (m_flag_camera_start) {
+        // We need to send this command regardless of previous state to trigger AF
         m_touch_af_start_stop = start_stop;
         if (fimc_v4l2_s_ctrl(m_cam_fd, V4L2_CID_CAMERA_TOUCH_AF_START_STOP, start_stop) < 0) {
             ALOGE("ERR(%s):Fail on V4L2_CID_CAMERA_TOUCH_AF_START_STOP", __func__);
@@ -2659,14 +2660,16 @@ int SecCamera::setObjectPosition(int x, int y)
 {
     ALOGV("%s(setObjectPosition(x=%d, y=%d))", __func__, x, y);
 
-    if (fimc_v4l2_s_ctrl(m_cam_fd, V4L2_CID_CAMERA_OBJECT_POSITION_X, x) < 0) {
-        ALOGE("ERR(%s):Fail on V4L2_CID_CAMERA_OBJECT_POSITION_X", __func__);
-        return -1;
-    }
+    if (m_flag_camera_start) {
+        if (fimc_v4l2_s_ctrl(m_cam_fd, V4L2_CID_CAMERA_OBJECT_POSITION_X, x) < 0) {
+            ALOGE("ERR(%s):Fail on V4L2_CID_CAMERA_OBJECT_POSITION_X", __func__);
+            return -1;
+        }
 
-    if (fimc_v4l2_s_ctrl(m_cam_fd, V4L2_CID_CAMERA_OBJECT_POSITION_Y, y) < 0) {
-        ALOGE("ERR(%s):Fail on V4L2_CID_CAMERA_OBJECT_POSITION_Y", __func__);
-        return -1;
+        if (fimc_v4l2_s_ctrl(m_cam_fd, V4L2_CID_CAMERA_OBJECT_POSITION_Y, y) < 0) {
+            ALOGE("ERR(%s):Fail on V4L2_CID_CAMERA_OBJECT_POSITION_Y", __func__);
+            return -1;
+        }
     }
 
     return 0;