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Having hardware inversion and having dedicated waveform modes optimized for white on black are two different things.
Every i.MX EPDC can do the former (barring glaring kernel bugs in some early iterations), while the latter is reserved for the PW4/KOA2/KOA3.
(Other devices, starting with the PW2, since FW 5.6.x only, have *minimal* waveform optimizations, but nothing as fancy. The actual toggle is only present on devices w/ fancy support, IIRC).
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