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[media] saa7191: fix querystd

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Return V4L2_STD_UNKNOWN if no signal is detected.
Otherwise AND the standard mask with the detected standards.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2013-05-29 10:18:59 -03:00 committed by Mauro Carvalho Chehab
parent af1f7284da
commit ec276a5a26
1 changed files with 8 additions and 6 deletions
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14
drivers/media/i2c/saa7191.c
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@ -271,7 +271,7 @@ static int saa7191_querystd(struct v4l2_subdev *sd, v4l2_std_id *norm)
dprintk("SAA7191 extended signal auto-detection...\n");
*norm = V4L2_STD_NTSC | V4L2_STD_PAL | V4L2_STD_SECAM;
*norm &= V4L2_STD_NTSC | V4L2_STD_PAL | V4L2_STD_SECAM;
stdc &= ~SAA7191_STDC_SECS;
ctl3 &= ~(SAA7191_CTL3_FSEL);
@ -302,7 +302,7 @@ static int saa7191_querystd(struct v4l2_subdev *sd, v4l2_std_id *norm)
if (status & SAA7191_STATUS_FIDT) {
/* 60Hz signal -> NTSC */
dprintk("60Hz signal: NTSC\n");
*norm = V4L2_STD_NTSC;
*norm &= V4L2_STD_NTSC;
return 0;
}
@ -324,12 +324,13 @@ static int saa7191_querystd(struct v4l2_subdev *sd, v4l2_std_id *norm)
if (status & SAA7191_STATUS_FIDT) {
dprintk("No 50Hz signal\n");
saa7191_s_std(sd, old_norm);
return -EAGAIN;
*norm = V4L2_STD_UNKNOWN;
return 0;
}
if (status & SAA7191_STATUS_CODE) {
dprintk("PAL\n");
*norm = V4L2_STD_PAL;
*norm &= V4L2_STD_PAL;
return saa7191_s_std(sd, old_norm);
}
@ -349,18 +350,19 @@ static int saa7191_querystd(struct v4l2_subdev *sd, v4l2_std_id *norm)
/* not 50Hz ? */
if (status & SAA7191_STATUS_FIDT) {
dprintk("No 50Hz signal\n");
err = -EAGAIN;
*norm = V4L2_STD_UNKNOWN;
goto out;
}
if (status & SAA7191_STATUS_CODE) {
/* Color detected -> SECAM */
dprintk("SECAM\n");
*norm = V4L2_STD_SECAM;
*norm &= V4L2_STD_SECAM;
return saa7191_s_std(sd, old_norm);
}
dprintk("No color detected with SECAM - Going back to PAL.\n");
*norm = V4L2_STD_UNKNOWN;
out:
return saa7191_s_std(sd, old_norm);