The ADV7180 and ADV7182 transmit whole fields, bottom field followed
by top (or vice-versa, depending on detected video standard). So
for chips that do not have support for explicitly setting the field
mode via I2P, set the field mode to V4L2_FIELD_ALTERNATE.
I2P converts fields into frames using an edge adaptive algorithm. The
frame rate is the same as the 'field rate': e.g. X fields per second
are now X frames per second.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
drivers/media/i2c/adv7180.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index 25d24a3f10a7cb4d..c2e24132e8c21d38 100644
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -644,6 +644,9 @@ static int adv7180_mbus_fmt(struct v4l2_subdev *sd,
fmt->width = 720;
fmt->height = state->curr_norm & V4L2_STD_525_60 ? 480 : 576;
+ if (state->field == V4L2_FIELD_ALTERNATE)
+ fmt->height /= 2;
+
return 0;
}
@@ -711,11 +714,11 @@ static int adv7180_set_pad_format(struct v4l2_subdev *sd,
switch (format->format.field) {
case V4L2_FIELD_NONE:
- if (!(state->chip_info->flags & ADV7180_FLAG_I2P))
- format->format.field = V4L2_FIELD_INTERLACED;
- break;
+ if (state->chip_info->flags & ADV7180_FLAG_I2P)
+ break;
+ /* fall through */
default:
- format->format.field = V4L2_FIELD_INTERLACED;
+ format->format.field = V4L2_FIELD_ALTERNATE;
break;
}
@@ -1291,7 +1294,7 @@ static int adv7180_probe(struct i2c_client *client,
return -ENOMEM;
state->client = client;
- state->field = V4L2_FIELD_INTERLACED;
+ state->field = V4L2_FIELD_ALTERNATE;
state->chip_info = (struct adv7180_chip_info *)id->driver_data;
state->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
--
2.18.0
