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Diffstat (limited to 'drivers/media/video/saa7115.c')
| -rw-r--r-- | drivers/media/video/saa7115.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/media/video/saa7115.c b/drivers/media/video/saa7115.c index 3e4e5584c5d..5d33d0922e7 100644 --- a/drivers/media/video/saa7115.c +++ b/drivers/media/video/saa7115.c @@ -668,6 +668,16 @@ static void saa7115_set_v4lstd(struct i2c_client *client, v4l2_std_id std) struct saa7115_state *state = i2c_get_clientdata(client); int taskb = saa7115_read(client, 0x80) & 0x10; + /* Prevent unnecessary standard changes. During a standard + change the I-Port is temporarily disabled. Any devices + reading from that port can get confused. + Note that VIDIOC_S_STD is also used to switch from + radio to TV mode, so if a VIDIOC_S_STD is broadcast to + all I2C devices then you do not want to have an unwanted + side-effect here. */ + if (std == state->std) + return; + // This works for NTSC-M, SECAM-L and the 50Hz PAL variants. if (std & V4L2_STD_525_60) { saa7115_dbg("decoder set standard 60 Hz\n"); |