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Commit 30b54d50 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
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V4L/DVB (3254): Don't reprogram the video standard if it is unchanged. 




- Don't reprogram the video standard if the new standard
equals the old standard.

Signed-off-by: default avatarHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@brturbo.com.br>
parent 8a854284

drivers/media/video/saa7115.c

+10 −0
Original line number Diff line number Diff line
@@ -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");