Re: [PATCH] drm/i2c: tda998x: don't register the connector

[Brian Starkey]

Hi,

On Mon, Jul 25, 2016 at 05:08:21PM +0200, Daniel Vetter wrote:
> On Mon, Jul 25, 2016 at 01:54:06PM +0100, Brian Starkey wrote:
> > Hi Russell,
> >
> > On Mon, Jul 25, 2016 at 01:25:04PM +0100, Russell King - ARM Linux wrote:
> > > On Mon, Jul 25, 2016 at 11:55:48AM +0100, Brian Starkey wrote:
> > > > The connector shouldn't be registered until the rest of the whole device
> > > > is set up, so that consistent state is presented to userspace.
> > > >
> > > > As drm_dev_register() now registers all of the connectors anyway,
> > > > there's no need to explicitly do it in individual drivers so remove
> > > > the calls to drm_connector_register()/drm_connector_unregister().
> > > >
> > > > This allows componentised drivers to use tda998x without having racy
> > > > initialisation.
> > >
> > > Is there a corresponding patch for armada-drm so that the cubox doesn't
> > > regress?  Has it already been merged?
> > >
> >
> > A patch for armada-drm to do what?
> >
> > I should perhaps have explicitly mentioned that this change depends
> > on e28cd4d0a223: "drm: Automatically register/unregister all
> > connectors", which is in drm-next.
> >
> > Like my commit message says - after the above commit, all connectors
> > are automatically registered in drm_dev_register() - so I don't
> > anticipate any regression, but I don't have a cubox to test.
> >
> > armada-drm seems to be doing effectively the same thing as arm/hdlcd,
> > which works fine after this patch with no other changes.
> >
> > Let me know if I've missed something; or if you are able to test on
> > cubox that would be great.
>
> Ack from my side on generally nuking drm_connector_register() from
> everywhere except truely hotplugged connectors like dp mst. It should keep
> working for everyone. Only exception is if there's a driver which calls
> drm_dev_register too early (before all connectors are probed), which would
> be a bug anyway.

Right; the motivation for this change is to fix the init order in
HDLCD and Mali-DP (move drm_dev_register to the end), which we can't
do right now because tda998x expects the DRM device sysfs to be set
up in bind.

@Daniel: Can I take this as your Acked-by?

Should this go in via Russell's tree?

@Russell, are you happy with this change?

Thanks,
Brian

> -Daniel
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch