On Fri, 13 Mar 2020 at 12:15, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote: > > Hi all, > > I've been testing and debugging OV5640 with TI's DRA76 and AM65 platforms, which have the CAL IP for > MIPI CSI2 RX. > > The most clear problem is that 1280x720@30 doesn't work at all, but with all resolutions I can see > occasional PHY errors reported when starting the streaming. > > The OV5640 spec lists the video timings, but I haven't been able to figure out what exactly they > mean, as e.g. the vsync time doesn't seem to match the other times according to my calculations. > > In any case, I was poking here and there, and noticed that if I use the htot value from the spec > (2844), instead of the current value (1896 for most resolutions), 1280x720 works, and the PHY errors > are gone. > > Testing more, I found out that the smaller the htot, the more unreliable the RX becomes, and going > down from 2844, somewhere around 2400 I start to see errors. > > I'm not that much familiar with CSI-2, and very little with OV5640. Does anyone have a clue about > what I'm observing here? Does 1280x720@30 work on other platforms with CSI2? Where do the current > OV5640 video timings come from? On my side, It works at least with dragonboard-410c (Qualcomm APQ8016). Regards, Loic
