[RFC PATCH 16/15] adv7604: return immediately if the new timings are equal to what is configured

[Hans Verkuil <hverkuil@xs4all.nl>]

Signed-off-by: Mats Randgaard <matrandg@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
---
 drivers/media/i2c/adv7604.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
index cfeaaaf..a1fa9a0 100644
--- a/drivers/media/i2c/adv7604.c
+++ b/drivers/media/i2c/adv7604.c
@@ -1423,6 +1423,11 @@ static int adv7604_s_dv_timings(struct v4l2_subdev *sd,
 	if (!timings)
 		return -EINVAL;
 
+	if (v4l2_match_dv_timings(&state->timings, timings, 0)) {
+		v4l2_dbg(1, debug, sd, "%s: no change\n", __func__);
+		return 0;
+	}
+
 	bt = &timings->bt;
 
 	if ((is_analog_input(sd) && bt->pixelclock > 170000000) ||
-- 
1.8.4.rc3