Re: [RFC v3 09/33] rust: drm/kms: Add DriverConnector::get_mode callback

[Lyude Paul]

On Fri, 2025-03-14 at 12:57 +0100, Maxime Ripard wrote:
> It's kind of what I wanted to express in my earlier statements I guess,
> but I'm not really sure we should force down helpers on drivers. The
> larger approach KMS has taken over the years was to provide hooks and
> default implementations, with the drivers allowed to use different
> implementations if they wanted to.
> 
> That approach largely worked for us I think, so I'm a bit worried about
> changing that.

This is mainly just another case of "this is the only way of probing we
support right now". In the future when we add more fine-grained behavior here,
we can stop passing helpers explicitly and only pass them when the appropriate
trait methods are defined.

> 
> >               debugfs_init: None,
> >               oob_hotplug_event: None,
> >               atomic_duplicate_state: Some(atomic_duplicate_state_callback::<Self::State>),
> > @@ -114,7 +114,7 @@ pub trait DriverConnector: Send + Sync + Sized {
> >           helper_funcs: bindings::drm_connector_helper_funcs {
> >               mode_valid: None,
> >               atomic_check: None,
> > -            get_modes: None,
> > +            get_modes: Some(get_modes_callback::<Self>),
> >               detect_ctx: None,
> 
> Since you pass (the equivalent of) the locking context to get_modes, I'd
> rather keep the convention you have with detect here and use the _ctx
> suffix, or drop the one from detect_ctx, and pass the context
> everywhere. But we should be consistent there at least.

Not totally sure what you mean by this? get_modes_callback() is just the
automatically generated vtable function, which gets generated based off the
rust trait implementation. but I can rename it if you think we should.

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

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