[PATCH] drm/i915/display: Allow async flips on planes with no framebuffer changes

[Xaver Hugl]

Am Do., 10. Juli 2025 um 22:21 Uhr schrieb Ville Syrjälä
<ville.syrjala at linux.intel.com>:
>
> On Mon, Jul 07, 2025 at 03:41:20PM +0000, Naveen Kumar wrote:
> > Allow asynchronous page flips on planes that either lack a framebuffer or
> > retain the same framebuffer, as long as no plane properties are modified.
> >
> > This avoids unnecessary failures in async flip paths when the update is
> > effectively a no-op, improving compatibility with some compositors.
>
> IMO what we want to do is make the drm core filter out all the garbage
> from the commit. That way the driver would only see the planes that are
> supposed to actually participate in the async flip.

That sounds like a good goal, but I think it'll need some extra care
to avoid regressions. For example, "no-op" pageflips must still
trigger pageflip events, and affect the refresh rate with adaptive
sync.