Maxime Ripard <maxime.ripard@xxxxxxxxxxx> writes: > The vc4 HVS uses an internal RGB888 representation of the frames, and will > by default expand formats using a lower depth using zeros. > > This causes an issue when we try to use other compositing software such as > pixman that seems to be filling the missing bits using the format least > significant bit value. As such, this prevents us from checking the display > output in a reliable way. I don't think this is the right expansion function, though? My understanding of proper unorm expansion, and what pixman's unorm_to_unorm() does, is that you replicate the value in the missing bits until you've filled them all (so SCALER_CTL0_EXPAND_REPEAT)
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