Comment # 4 on bug 110327 from Jens Ziller

No, the ioctl there 
https://github.com/zillevdr/v4l2-drm-test/blob/master/v4l2.c#L150
looks what format MFC can use. This I set in line 155. The output from fprintf
line 174:
FMT CAPTURE: width 1280 height 736 4cc TM12 num_planes 2

https://www.linuxtv.org/downloads/v4l-dvb-apis-new/uapi/v4l/yuv-formats.html
say that TM12 is V4L2_PIX_FMT_NV12MT not V4L2_PIX_FMT_NV12MT_16X16. I think the
right format is set.