Innomaker ov9281 produces blank images on pi5 with rpicam-still

[Gordon999]

innomaker ov9281 on pi5 with rapicam-still -o test.jpg only gets a black image, preview OK, rpicam-vid appears OK recording.

[naushir]

Has this worked in the past? My suspicion would be that it's a problem with the kernel driver and nothing to do with libcamera.

[6by9]

I asked Gordon to raise it here as it's less likely to get lost than in the linux repo.
https://forums.raspberrypi.com/viewtopic.php?p=2279207#p2279207

Not sure if it is going to be ov9282, cfe, or something else at fault. It works fine on Pi4.
Solution may be skip frames in libcamera.

[6by9]

Odd. In testing out #6705, OV9281 has just worked perfectly on both Pi5 and CM5 with a 6.12.17 kernel.

[6by9]

Been poking this as part of raspberrypi/linux#6705

It looks to be related to the CSI2 clocking mode.

The ov9281 overlay gained an override for the clocking mode via raspberrypi/linux#6700

If you use sudo rpi-update rpi-6.6.y to get the latest 6.6 kernel (it's not on 6.12 yet), then dtoverlay=ov9281,clk-continuous should work, but I believe dtoverlay=ov9281 won't.

[Gordon999]

Thankyou, that worked