Hi Tim,

On 1/5/21 3:57 PM, Tim Harvey wrote:

On Sat, Jan 2, 2021 at 9:55 AM Steve Longerbeam [off-list ref] wrote:

quoted

Hi Tim,

I gave this a shot a while ago, but I recall struggling with some
locking problems. I haven't been able to return to it. I've updated the
imx/add-fim-to-prpencvf branch to latest media-tree master branch
(5.11.0-rc1), in my github fork [1]. The patches against master are:

0001-media-imx.rst-update-doc-to-reflect-FIM-changes.patch
0002-media-imx-prpencvf-attach-FIM.patch
0003-WIP.patch

The last patch was my first attempts to debug the locking problems.

I don't have access to imx6 hardware any longer, so I can't progress any
further on it at this point.

Steve

[1] git@github.com:slongerbeam/mediatree.git

Steve,

Thanks for the patches!

I have found via experimentation that if you are using the VDIC to
de-interlace and you loose/regain the signal to the adv7180 it will
roll endlesslessly. However if you are doing raw capture the video
will sync up within a few seconds (240 lines * 16.6ms-per-frame =
3.8secs max I suspect). Thus the simplest solution for users who
suffer from this may just be to capture raw and upscale.

Yes, but for our users, a 3.8 second delay is unacceptable, for example 
in a rear-view-camera application, it's not acceptable to see rolling 
video for that long. Hence the FIM which will restore sync very quickly 
on loss/regain of the analog signal to the adv718x.

Steve

Best regards,

Tim