V4L/DVB (12336): ivtv: Fix improper GPIO audio mux input switch on video standard change

Remove the subdev_s_std() method from the GPIO subdev.  It appears it was
used in the past to effect the switch back from radio mode to tuner mode,
but it had a side effect that is improper and against the V4L2 spec, when
you were not in radio mode.  Whenever the video stanadrd was changed, the
GPIO audio mux was set back to the tuner audio input, even if you were set
to a Line In input.

Thanks to Ravi A. for doing the troubleshooting to point me right to the
problem.

Reported-by: Ravi A <asvravi@gmail.com>
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/ivtv/ivtv-gpio.c

@@ -236,18 +236,6 @@ static int subdev_s_radio(struct v4l2_subdev *sd)
 	return 0;
 }
 
-static int subdev_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
-{
-	struct ivtv *itv = sd_to_ivtv(sd);
-	u16 mask, data;
-
-	mask = itv->card->gpio_audio_input.mask;
-	data = itv->card->gpio_audio_input.tuner;
-	if (mask)
-		write_reg((read_reg(IVTV_REG_GPIO_OUT) & ~mask) | (data & mask), IVTV_REG_GPIO_OUT);
-	return 0;
-}
-
 static int subdev_s_audio_routing(struct v4l2_subdev *sd,
 				  u32 input, u32 output, u32 config)
 {
@@ -344,7 +332,6 @@ static const struct v4l2_subdev_core_ops subdev_core_ops = {
 	.g_ctrl = subdev_g_ctrl,
 	.s_ctrl = subdev_s_ctrl,
 	.queryctrl = subdev_queryctrl,
-	.s_std = subdev_s_std,
 };
 
 static const struct v4l2_subdev_tuner_ops subdev_tuner_ops = {