Phonetic contrast between lenis unvoiced and lenis voiced?

Are there languages where it is the norm* to phonemically contrast
lenis voiced and lenis unvoiced stop phonemes?
* i.e., where such a contrast is found in most speakers' speech

In spoken Malayalam, such a contrast is found in a small minority of
speakers:

In plebian Malayalam, an intervocalic stop is lenis; there's no
contrast between the realizations of a voiced stop phoneme and an
unvoiced stop phoneme.

In high register Malayalam, which can sound affected to plebians,
there can be a contrast between the realizations of a voiced stop
phoneme and an unvoiced stop phoneme, whereby the former is lenis
voiced whereas the latter is lenis unvoiced (except in the case of /
t./ vs. /d./ whose realizations may be contrasted as postalveolar
lenis stop vs. postalveolar flap).


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