I set the colibri imx6 to use the “EDT-WVGA” display setting. I attached an oscilloscope probe to LCD_PCLK_WR on the eval board. While the clock frequency on average is correct, there seems to be some “jitter” in the signal. Attached is an oscilloscope image with persistence on. You can see there are two different frequencies. I would expect this signal to much more consistent. Any ideas why this is happening and how to fix it?
I have created a custom carrier board and I see the same thing. On this custom carrier I am sending the display signals to a serializer. The serializer is trying to lock onto the pixel clock but I think this is messing it up.