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SubjectRe: [PATCH v3 17/24] media: imx: Add CSI subdev driver
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On Tue, 2017-01-31 at 16:51 +0100, Philipp Zabel wrote:
> On Fri, 2017-01-06 at 18:11 -0800, Steve Longerbeam wrote:
> [...]
> > +static int csi_set_fmt(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_format *sdformat)
> > +{
> > + struct csi_priv *priv = v4l2_get_subdevdata(sd);
> > + struct v4l2_mbus_framefmt *infmt, *outfmt;
> > + struct v4l2_rect crop;
> > + int ret;
> > +
> > + if (sdformat->pad >= CSI_NUM_PADS)
> > + return -EINVAL;
> > +
> > + if (priv->stream_on)
> > + return -EBUSY;
> > +
> > + infmt = &priv->format_mbus[priv->input_pad];
> > + outfmt = &priv->format_mbus[priv->output_pad];
> > +
> > + if (sdformat->pad == priv->output_pad) {
> > + sdformat->format.code = infmt->code;
> > + sdformat->format.field = infmt->field;
> > + crop.left = priv->crop.left;
> > + crop.top = priv->crop.top;
> > + crop.width = sdformat->format.width;
> > + crop.height = sdformat->format.height;
> > + ret = csi_try_crop(priv, &crop);
>
> This is the wrong way around, see also below.
>
> Here the the output sdformat->format.width/height should be set to the
> priv->crop.width/height (or priv->crop.width/height / 2, to enable
> downscaling). The crop rectangle should not be changed by an output pad
> set_fmt.
[...]
> The crop rectangle instead should be reset to the full input frame when
> the input pad format is set.

How about this:

----------8<----------
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 5e80a0871b139..8220e4204a125 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -484,6 +484,8 @@ static int csi_setup(struct csi_priv *priv)
if_fmt.field = outfmt->field;

ipu_csi_set_window(priv->csi, &priv->crop);
+ ipu_csi_set_downsize(priv->csi, priv->crop.width == 2 * outfmt->width,
+ priv->crop.height == 2 * outfmt->height);

ipu_csi_init_interface(priv->csi, &sensor_mbus_cfg, &if_fmt);

@@ -830,15 +832,14 @@ static int csi_set_fmt(struct v4l2_subdev *sd,
switch (sdformat->pad) {
case CSI_SRC_PAD_DIRECT:
case CSI_SRC_PAD_IDMAC:
- crop.left = priv->crop.left;
- crop.top = priv->crop.top;
- crop.width = sdformat->format.width;
- crop.height = sdformat->format.height;
- ret = csi_try_crop(priv, &crop, sensor);
- if (ret)
- return ret;
- sdformat->format.width = crop.width;
- sdformat->format.height = crop.height;
+ if (sdformat->format.width < priv->crop.width * 3 / 4)
+ sdformat->format.width = priv->crop.width / 2;
+ else
+ sdformat->format.width = priv->crop.width;
+ if (sdformat->format.height < priv->crop.height * 3 / 4)
+ sdformat->format.height = priv->crop.height / 2;
+ else
+ sdformat->format.height = priv->crop.height;

if (sdformat->pad == CSI_SRC_PAD_IDMAC) {
cc = imx_media_find_format(0, sdformat->format.code,
@@ -887,6 +888,14 @@ static int csi_set_fmt(struct v4l2_subdev *sd,
}
break;
case CSI_SINK_PAD:
+ crop.left = 0;
+ crop.top = 0;
+ crop.width = sdformat->format.width;
+ crop.height = sdformat->format.height;
+ ret = csi_try_crop(priv, &crop, sensor);
+ if (ret)
+ return ret;
+
cc = imx_media_find_format(0, sdformat->format.code,
true, false);
if (!cc) {
@@ -904,9 +913,8 @@ static int csi_set_fmt(struct v4l2_subdev *sd,
} else {
priv->format_mbus[sdformat->pad] = sdformat->format;
priv->cc[sdformat->pad] = cc;
- /* Update the crop window if this is an output pad */
- if (sdformat->pad == CSI_SRC_PAD_DIRECT ||
- sdformat->pad == CSI_SRC_PAD_IDMAC)
+ /* Reset the crop window if this is the input pad */
+ if (sdformat->pad == CSI_SINK_PAD)
priv->crop = crop;
}

---------->8----------
regards
Philipp

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