In one of our multimedia device, we recently found an issue with DSS. Below is a description of the issue.
If we make & break the LVDS lines while the camera subsystem is running, it causes the Display subsystem to go out of sync. Though the display driver has its own recovery mechanism to come to normal, it seems like that itself causing the reset.
When the DSS is out-of-sync with ISP, it triggers the SYNC LOST ISR. And we noticed that whenever this ISR occurs, it resets the system.
What we tried so far is:
1. Disable DSS interrupts & Turn off the entire DSS if there is a signal loss on the LVDS lines. Turn back again once the LVDS is normal.
2. Turn off Video layer.
3. Temporarily stop the ISP.
We tried masking the ISR but still the issue persists. Can someone shed some light on what's going on?
FYI: our imager is connected serially(LVDS) to the OMAP.