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    SubjectRe: [PATCH v7 4/6] drm: Refuse to async flip with atomic prop changes
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    On 10/23/23 10:27, Simon Ser wrote:
    > On Sunday, October 22nd, 2023 at 12:12, Michel Dänzer <michel.daenzer@mailbox.org> wrote:
    >> On 10/17/23 14:16, Simon Ser wrote:
    >>
    >>> After discussing with André it seems like we missed a plane type check
    >>> here. We need to make sure FB_ID changes are only allowed on primary
    >>> planes.
    >>
    >> Can you elaborate why that's needed?
    >
    > Current drivers are in general not prepared to perform async page-flips
    > on planes other than primary. For instance I don't think i915 has logic
    > to perform async page-flip on an overlay plane FB_ID change.

    That should be handled in the driver's atomic_check then?

    Async flips of overlay planes would be useful e.g. for presenting a windowed application with tearing, while the rest of the desktop is tear-free.


    --
    Earthling Michel Dänzer | https://redhat.com
    Libre software enthusiast | Mesa and Xwayland developer

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