[media] adv7183: fix querystd

If no signal is detected, return V4L2_STD_UNKNOWN. Otherwise AND the standard
with the detected standards.
Note that the v4l2 core initializes the std with tvnorms before calling the
querystd ioctl.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Scott Jiang <scott.jiang.linux@gmail.com>
Acked-by: Scott Jiang <scott.jiang.linux@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 8 insertions, 8 deletions

diff --git a/drivers/media/i2c/adv7183.c b/drivers/media/i2c/adv7183.c
index 980815d37bb1..6f738d8e3a8f 100644
--- a/drivers/media/i2c/adv7183.c
+++ b/drivers/media/i2c/adv7183.c
@@ -374,28 +374,28 @@ static int adv7183_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
         reg = adv7183_read(sd, ADV7183_STATUS_1);
         switch ((reg >> 0x4) & 0x7) {
         case 0:
-                *std = V4L2_STD_NTSC;
+                *std &= V4L2_STD_NTSC;
                 break;
         case 1:
-                *std = V4L2_STD_NTSC_443;
+                *std &= V4L2_STD_NTSC_443;
                 break;
         case 2:
-                *std = V4L2_STD_PAL_M;
+                *std &= V4L2_STD_PAL_M;
                 break;
         case 3:
-                *std = V4L2_STD_PAL_60;
+                *std &= V4L2_STD_PAL_60;
                 break;
         case 4:
-                *std = V4L2_STD_PAL;
+                *std &= V4L2_STD_PAL;
                 break;
         case 5:
-                *std = V4L2_STD_SECAM;
+                *std &= V4L2_STD_SECAM;
                 break;
         case 6:
-                *std = V4L2_STD_PAL_Nc;
+                *std &= V4L2_STD_PAL_Nc;
                 break;
         case 7:
-                *std = V4L2_STD_SECAM;
+                *std &= V4L2_STD_SECAM;
                 break;
         default:
                 *std = V4L2_STD_UNKNOWN;