Re: [PATCH v3 3/3] drm/amd/display: advertise PIXEL_NONE as blend mode for DCE generations

Xaver Hugl <[email protected]>
Newsgroups org.freedesktop.lists.amd-gfx,org.freedesktop.lists.dri-devel
Message-ID <CAFZQkGxwOQ6a+ZmjfNE=BnKV3VosOm6A_7=3rmWowTTwZsD3Tw@mail.gmail.com> 
> I suspect KDE is not interpreting correctly the blend mode
Yeah, KWin made the assumption that pre-multiplied is always
supported, since the documentation said so in the past.
Thanks for notifying me, I'll have that fixed in the next bugfix update.

> I think we can keep it working as before by adding PREMULTI. In the end there is no overlay plane for DCE, and PIXEL_NONE and PREMULTI are equivalent when one primary is composed on top of a black background.
Makes sense to me.

- Xaver
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