[PATCH 3/3] drm/atomic: Refuse to steal encoders from connectors not part of the state.

[Maarten Lankhorst]

Op 18-02-16 om 12:07 schreef Daniel Vetter:
> On Thu, Feb 18, 2016 at 09:54:43AM +0100, Maarten Lankhorst wrote:
>> Because encoder <-> connector mapping is fixed when not moving to
>> another crtc we can just reject connectors trying to steal an encoder
>> from a connector not part of the state. This won't break MST on i915
>> because in that case connectors will be part of the state if you switch
>> them between crtc's. If they're not they stay on the same crtc, and
>> encoder stealing would have failed anyway.
> We must do this for backwards compat. setCrtc on a connector that needs an
> encoder already used on some other crtc is supposed to disable that
> encoder (and the entire pipe if it's all unused) if we need it.
> -Daniel
>
Could this be done from the setcrtc helper? Seems with atomic that wouldn't be desired behavior.

~Maarten