drivers/video/isx019: Clear clip setting in unnecessary cases

In QVGA or QQVGA cases, FPGA clip setting "clip 1280x720" or "clip 640x360"
may cause the delay of data transmission and error detection in applications.

drivers/video/isx019.c

@@ -1446,7 +1446,7 @@ static int activate_clip(imgsensor_stream_type_t type,
 
         break;
 
-      default: /* 640 */
+      case 640:
         if (clip->width == 640)
           {
             /* In this case, clip->height == 360 */
@@ -1474,6 +1474,12 @@ static int activate_clip(imgsensor_stream_type_t type,
           }
 
         break;
+
+      default: /* Otherwise, clear clip setting. */
+        size = FPGA_CLIP_NON;
+        top  = 0;
+        left = 0;
+        break;
     }
 
   fpga_i2c_write(FPGA_CLIP_SIZE, &size, 1);
@@ -1535,30 +1541,27 @@ static int isx019_start_capture(imgsensor_stream_type_t type,
     }
 
   switch (fmt[IMGSENSOR_FMT_MAIN].width)
-   {
-     case 1280:
-       regval |= FPGA_SCALE_1280_960;
-       activate_clip(type,
-                     fmt[IMGSENSOR_FMT_MAIN].width,
-                     fmt[IMGSENSOR_FMT_MAIN].height);
-       break;
-
-     case 640:
-       regval |= FPGA_SCALE_640_480;
-       activate_clip(type,
-                     fmt[IMGSENSOR_FMT_MAIN].width,
-                     fmt[IMGSENSOR_FMT_MAIN].height);
-       break;
-
-     case 320:
-       regval |= FPGA_SCALE_320_240;
-       break;
-
-     default: /* 160 */
-
-       regval |= FPGA_SCALE_160_120;
-       break;
-   }
+    {
+      case 1280:
+        regval |= FPGA_SCALE_1280_960;
+        break;
+
+      case 640:
+        regval |= FPGA_SCALE_640_480;
+        break;
+
+      case 320:
+        regval |= FPGA_SCALE_320_240;
+        break;
+
+      default: /* 160 */
+        regval |= FPGA_SCALE_160_120;
+        break;
+    }
+
+  activate_clip(type,
+               fmt[IMGSENSOR_FMT_MAIN].width,
+               fmt[IMGSENSOR_FMT_MAIN].height);
 
   fpga_i2c_write(FPGA_FORMAT_AND_SCALE, &regval, 1);