Re: [PATCH RFC 0/8] drm: Add DRM_MODE_ATOMIC_RESET flag

[Maxime Ripard]

Hi Xaver,

On Wed, Jul 08, 2026 at 08:25:36PM +0200, Xaver Hugl wrote:
> Hi,
> 
> Thanks for working on this, it'll be great to finally have this solved properly.
> 
> > Open question: should DRM_MODE_ATOMIC_RESET require
> > DRM_MODE_ATOMIC_ALLOW_MODESET? A full state reset will change CRTC
> > active states, which is effectively a modeset. Without requiring it,
> > a reset could pass flag validation but fail later at atomic_check in
> > a confusing way.
>
> The compositor may use the same CRTC states, modes etc; whether or not
> the commit actually ends up requiring a modeset depends entirely on
> the exact contents of the commit. So I definitely wouldn't require
> ALLOW_MODESET.

Just to make sure we're on the same page, you're saying that when using
the reset flag, the compositor is expected to fill the state with enough
that a modeset is unlikely to happen anyway?

Maxime

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