ADV7280 capture

[Tim Harvey]

Fabio,

Recently you mentioned you were capturing successfully using an
adv7280 analog video decoder on an imx6dl with 5.10.

I have found that using the adv7280 on an imx6q/dl does not work
without a patch [1] to make the output format of the adv7280 the same
as the adv7180. I'm not sure what the best solution for this issue is
as the patch was nak'd because it may break existing users of the
adv7280. I suspect perhaps the best approach is to add a kernel module
parameter or device-tree property to configure the adv7280 for
compatibility with the imx6 CSI.

I also still have to patch imx-media-csi.c to skip the first few
frames in order to sync properly on bt656 sources [2]. I'm also not
sure if this patch is perhaps acceptable upstream of of there is a
better solution.

I would have expected you to run into these issues as well?

Here is the media-ctl setup that I use:
media-ctl -l "'adv7180 0-0020':0 -> 'ipu1_csi1_mux':4[1]"
media-ctl -l "'ipu1_csi1_mux':5 -> 'ipu1_csi1':0[1]"
media-ctl -l "'ipu1_csi1':1 -> 'ipu1_vdic':0[1]"
media-ctl -l "'ipu1_vdic':2 -> 'ipu1_ic_prp':0[1]"
media-ctl -l "'ipu1_ic_prp':2 -> 'ipu1_ic_prpvf':0[1]"
media-ctl -l "'ipu1_ic_prpvf':1 -> 'ipu1_ic_prpvf capture':0[1]"
media-ctl -V "'adv7180 0-0020':0 [fmt:UYVY2X8/640x480 field:seq-tb]"
media-ctl -V "'ipu1_csi1_mux':5 [fmt:UYVY2X8/640x480]"
media-ctl -V "'ipu1_csi1':1 [fmt:AYUV32/640x480]"
media-ctl -V "'ipu1_vdic':2 [fmt:AYUV32/640x480 field:none]"
media-ctl -V "'ipu1_ic_prp':2 [fmt:AYUV32/640x480 field:none]"
media-ctl -V "'ipu1_ic_prpvf':1 [fmt:AYUV32/640x480 field:none]"
v4l2-ctl -d2 --set-fmt-video=field=none

gst-launch-1.0 v4l2src device=/dev/video2 ! kmssink:

Best Regards,

Tim
[1] - https://patchwork.kernel.org/project/linux-media/patch/20190827215539.1286-1-mmichilot@gateworks.com
[2] - https://github.com/Gateworks/linux-imx6/commit/959fbd4