Hi all, I have implemented runtime display switching in the MIPI switch design where LVDS and HDMI bridges are selected with the help of runtime GPIO. Initial discussion on the same can be found here, https://www.spinics.net/lists/dri-devel/msg318524.html The implementation has been done by creating each connector at runtime. The default boot will create the LVDS connector and based on the HDMI plug-in the ISR. 1. forcing the LVDS to disconnect 2. call drm_kms_helper_hotplug_event 3. detach the bridge chain 4. attach the new bridge chain (HDMI) 5. call drm_kms_helper_hotplug_event do the reverse when we unplug the HDMI cable. So, the bridge chains are attached and detached based on GPIO Interrupt which is indeed identified based on the physical HDMIA connector. Pipeline for LVDS, mxfsb => nwl-dsi => display-switch => sn65dsi83=> panel-bridge Pipeline for HDMI, mxfsb => nwl-dsi => display-switch => adv7511 => display-connector With this, implementation and I can able switch the displays with default DRM (without specific DRM applications) where the LVDS is ON by default and when HDMI plug-in the LVDS OFF/HDMI ON, and when HDMI unplug the HDMI OFF/LVDS ON. However, with QT5 I can see the DRM Master ignoring hotplug event by returning 0 on drm_master_internal_acquire in drm_fb_helper_hotplug_event. With this the hotplug returned early so it cannot able to disconnect and connect the new switching connector. Any help? Thanks, Jagan.
