Re: [PATCH v2] drm/bridge: Fix assignment of the of_node of the parent to aux bridge

[Johan Hovold <johan@kernel.org>]

On Fri, Nov 01, 2024 at 11:49:07AM +0800, Sui Jingfeng wrote:
> On 2024/11/1 00:23, Johan Hovold wrote:
> > On Thu, Oct 31, 2024 at 11:06:38PM +0800, Sui Jingfeng wrote:
> >
> >> But I think Johan do need more times to understand what exactly
> >> the real problem is. We do need times to investigate new method.

> > No, I know perfectly well what the (immediate) problem is here (I was
> > the one adding support for the of_node_reused flag some years back).
> >
> > I just wanted to make sure that the commit message was correct and
> > complete before merging (and also to figure out whether this particular
> > patch needed to be backported).
> 
> Well under such a design, having the child device sharing the 'OF' device
> node with it parent device means that one parent device can *only*
> create one AUX bridge child device.
> 
> Since If you create two or more child AUX bridge, *all* of them will
> call devm_drm_of_get_bridge(&auxdev->dev, auxdev->dev.of_node, 0, 0),
> then we will *contend* the same next bridge resource.
> 
> Because of the 'auxdev->dev.of_node' is same for all its instance.
> While other display bridges seems don't has such limitations.

Oh, I'm not saying that there cannot be further issues with the design
or implementation here. And perhaps fixing those would make the
immediate issue Abel was trying to address go away.

Johan