[media] v4l2-ioctl: clarify querystd comment

Improve the querystd comment.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 6774543..19e2988 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1385,10 +1385,10 @@ static int v4l_querystd(const struct v4l2_ioctl_ops *ops,
        v4l2_std_id *p = arg;
 
        /*
-        * If nothing detected, it should return all supported
-        * standard.
-        * Drivers just need to mask the std argument, in order
-        * to remove the standards that don't apply from the mask.
+        * If no signal is detected, then the driver should return
+        * V4L2_STD_UNKNOWN. Otherwise it should return tvnorms with
+        * any standards that do not apply removed.
+        *
         * This means that tuners, audio and video decoders can join
         * their efforts to improve the standards detection.
         */