On Fri, 2018-05-25 at 16:53 -0700, Steve Longerbeam wrote: > Interlaced scan, a.k.a. interweave, should be enabled at the CSI IDMAC > output pad if the input field type is 'alternate' (in addition to field > types 'seq-tb' and 'seq-bt'). > > Which brings up whether V4L2_FIELD_HAS_BOTH() macro should be used > to determine enabling interlaced/interweave scan. That macro > includes the 'interlaced' field types, and in those cases the data > is already interweaved with top/bottom field lines. A heads-up for > now that this if statement may need to call V4L2_FIELD_IS_SEQUENTIAL() > instead, I have no sensor hardware that sends 'interlaced' data, so can't > test.
I agree, the check here should be IS_SEQUENTIAL || ALTERNATE, and interlaced_scan should also be enabled if image.pix.field is INTERLACED_TB/BT. And for INTERLACED_TB/BT input, the logic should be inverted: then we'd have to enable interlaced_scan whenever image.pix.field is SEQ_BT/TB. regards Philipp > Signed-off-by: Steve Longerbeam <steve_longerb...@mentor.com> > --- > drivers/staging/media/imx/imx-media-csi.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/staging/media/imx/imx-media-csi.c > b/drivers/staging/media/imx/imx-media-csi.c > index 9bc555c..eef3483 100644 > --- a/drivers/staging/media/imx/imx-media-csi.c > +++ b/drivers/staging/media/imx/imx-media-csi.c > @@ -477,7 +477,8 @@ static int csi_idmac_setup_channel(struct csi_priv *priv) > ipu_smfc_set_burstsize(priv->smfc, burst_size); > > if (image.pix.field == V4L2_FIELD_NONE && > - V4L2_FIELD_HAS_BOTH(infmt->field)) > + (V4L2_FIELD_HAS_BOTH(infmt->field) || > + infmt->field == V4L2_FIELD_ALTERNATE)) > ipu_cpmem_interlaced_scan(priv->idmac_ch, > image.pix.bytesperline); >
