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The differences between Allwinner/MXC matter surprisingly little in practice, it's not even worth it to bother the base mxc driver with it. Instead, frontend can make some informed choice by probing for the hardware and tweaking requested device caps accordingly. On Allwinner B288, we disable both hwrot (done in software in kernel and terribly, ie not worth it) and hwinverse (no support whatsoever). On NXT we'll keep both on, as the kernel driver seems to be using the hardware properly .