[media] adv7604/adv7842: fix il_vbackporch typo and zero the struct

Both adv7604 and adv7842 had the same typo in the code that sets
the vertical backporch for the second interlaced field: it was
assigned to vbackporch instead of il_vbackporch.

In addition, the timings struct wasn't zeroed in the adv7842 driver,
leaving several fields to undefined values causing the timing match
function to fail.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/i2c/adv7604.c

@@ -1593,7 +1593,7 @@ static int adv7604_query_dv_timings(struct v4l2_subdev *sd,
 			bt->height += hdmi_read16(sd, 0x0b, 0xfff);
 			bt->il_vfrontporch = hdmi_read16(sd, 0x2c, 0x1fff) / 2;
 			bt->il_vsync = hdmi_read16(sd, 0x30, 0x1fff) / 2;
-			bt->vbackporch = hdmi_read16(sd, 0x34, 0x1fff) / 2;
+			bt->il_vbackporch = hdmi_read16(sd, 0x34, 0x1fff) / 2;
 		}
 		adv7604_fill_optional_dv_timings_fields(sd, timings);
 	} else {

drivers/media/i2c/adv7842.c

@@ -1435,6 +1435,8 @@ static int adv7842_query_dv_timings(struct v4l2_subdev *sd,
 
 	v4l2_dbg(1, debug, sd, "%s:\n", __func__);
 
+	memset(timings, 0, sizeof(struct v4l2_dv_timings));
+
 	/* SDP block */
 	if (state->mode == ADV7842_MODE_SDP)
 		return -ENODATA;
@@ -1483,7 +1485,7 @@ static int adv7842_query_dv_timings(struct v4l2_subdev *sd,
 					hdmi_read(sd, 0x2d)) / 2;
 			bt->il_vsync = ((hdmi_read(sd, 0x30) & 0x1f) * 256 +
 					hdmi_read(sd, 0x31)) / 2;
-			bt->vbackporch = ((hdmi_read(sd, 0x34) & 0x1f) * 256 +
+			bt->il_vbackporch = ((hdmi_read(sd, 0x34) & 0x1f) * 256 +
 					hdmi_read(sd, 0x35)) / 2;
 		}
 		adv7842_fill_optional_dv_timings_fields(sd, timings);