On Wed, 2017-02-08 at 15:23 -0800, Steve Longerbeam wrote:
[...]

quoted

quoted

+
+static int imxcsi2_get_fmt(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_format *sdformat)
+{
+	struct imxcsi2_dev *csi2 = sd_to_dev(sd);
+
+	sdformat->format = csi2->format_mbus;

The output formats are different from the input formats, see the media
bus format discussion in the other thread. The input pad is the MIPI
CSI-2 bus, but the four output pads are connected to the muxes / CSIs
via a 16-bit parallel bus.

So if the input format is UYVY8_1X16, for example, the output should be
set to UYVY8_2X8.

Since the output buses from the CSI2IPU gasket are 16-bit
parallel buses, shouldn't an input format UYVY8_1X16 also be
the same at the output?

I looked at the reference manual again, and I think I have read this
incorrectly, probably confused by the coloring in Figure 19-10 "YUV422-8
data reception" in the CSI2IPU chapter. It looks like indeed the 16-bit
bus carries UYVY8_1X16, whereas the internal 32-bit bus between MIPI
CSI-2 decoder and the CSI2IPU carries two samples (complete UYVY) per
pixel clock.
So UYVY is straight forward. It's the YUV420, RGB, and RAW formats that
would be interesting to describe correctly.

regards
Philipp