On Wed, Oct 26, 2022 at 09:08:49AM +0300, Dmitry Baryshkov wrote: > > > On 26 October 2022 06:26:21 EEST, Bjorn Andersson <quic_bjorande@xxxxxxxxxxx> wrote: > >From: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> > > > >The DisplayPort controller's internal HPD interrupt handling is used for > >cases where the HPD signal is connected to a GPIO which is pinmuxed into > >the DisplayPort controller. > > > >Most of the logic for enabling and disabling the HPD-related interrupts > >is conditioned on the presence of an EDP panel, but more generically > >designs that has a downstream drm_bridge (next_bridge) could use this to > >handle the HPD interrupts, instead of the internal mechanism. > > > >So replace the current is_edp-based guards with a check for the presence > >of next_bridge. > > This does not sound correct. The next bridge might be a dummy bridge, > not supporting the hpd. I only considered checking for the Chrome case, where the output isn't modelled and we have to rely on the internal HPD logic. Checking that next_bridge is present and will deliver us hpd events sounds somewhat reasonable. But if I understand the code correctly, panel-edp isn't handing us hpd events - and we still don't want the internal HPD logic to trigger. So I presume I would need to check that this isn't a EDP controller and that we're going to get external HPD events? If so, clean you please give me some pointer on how to check if next_bridge will provide us with hpd signaling or not? PS. Which dummy bridge do you have in mind? > Please change this to use the enable_hpd()/disable_hpd() callbacks. > This way the drm_bridge_connector framework will make sure to enable > hpd handling for the bridge that is actually supposed to generate hpd > events. > The drm_bridge_connector_init() call in dp_drm_connector_init() does this for us already. Regards, Bjorn > > > > >Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> > >Signed-off-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx> > >--- > > > >Changes since v2: > >- None > > > -- > With best wishes > Dmitry
