Hi Paul, Neil, > Am 04.03.2022 um 17:47 schrieb Paul Cercueil <p...@crapouillou.net>: > > From what I understood in Nikolaus' last message, HDMI hotplug is actually > correctly detected, so there's no need for polling. What is missing is the > call to drm_kms_helper_hotplug_event *somewhere*, so that the information is > correctly relayed to userspace.
Exactly. As Maxime pointed out it should already be called by drm_helper_hpd_irq_event() in dw_hdmi_irq() but isn't because mode_config.poll_enabled isn't enabled. So we can either a) enable mode_config.poll_enabled so that it is called by drm_helper_hpd_irq_event() or b) make drm_kms_helper_hotplug_event() being called explicitly in dw_hdmi_irq(). We could guard that by mode_config.poll_enabled to avoid drm_kms_helper_hotplug_event() being called twice (but I think the "changed" mechanism will take care of). > I think this issue can be fixed by calling drm_bridge_connector_enable_hpd() > on the connector in ingenic-drm-drv.c. I don't see yet how this would solve it, but it may work. Anyways, this all is a missing feature (sometimes called "bug") of the *dw-hdmi driver* and IMHO neither of the connector nor the ingenic-drm-drv. So I think it should not be solved outside dw-hdmi. BR and thanks, Nikolaus
