[PATCH] Revert "drm/msm/dp: use drm_bridge_hpd_notify() to report HPD status changes"

[Johan Hovold]

On Tue, Feb 27, 2024 at 02:11:56PM -0800, Abhinav Kumar wrote:
> On 2/27/2024 2:08 PM, Dmitry Baryshkov wrote:
> > This reverts commit e467e0bde881 ("drm/msm/dp: use
> > drm_bridge_hpd_notify() to report HPD status changes").
> > 
> > The commit changed the way how the MSM DP driver communicates
> > HPD-related events to the userspace. The mentioned commit made some of
> > the HPD events being reported earlier. This way userspace starts poking
> > around. It interacts in a bad way with the dp_bridge_detect and the
> > driver's state machine, ending up either with the very long delays
> > during hotplug detection or even inability of the DP driver to report
> > the display as connected.
> > 
> > A proper fix will involve redesigning of the HPD handling in the MSM DP
> > driver. It is underway, but it will be intrusive and can not be thought
> > about as a simple fix for the issue. Thus, revert the offending commit.
> 
> Yes, for fixing this on 6.9 I am fine with this.

Since this is a regression in 6.8-rc1, I hope you meant to say 6.8 here?

> I hope there were not other changes which were built on top of this. So 
> it will be better if we retest internal HPD case as well with this.
> 
> We will do that in a day or two and give Tested-by.

Johan