Hi, On Fri, Oct 11, 2024 at 08:43:05AM GMT, Thomas Zimmermann wrote: > Track a connector's physical status separately from the logical status > and implement BMC support for DRM drivers. Connectors with virtual BMC > stay connected even if no display is physically connected. DRM clients > then continue displaying output to the BMC. > > Ast and mgag200 have been doing this for a while. Moving this into > struct drm_connector and probe helpers simplifies htese divers and > makes the functionality available to others. Hibmc is a candidate here. > > Patch just simplifies code in probe helpers and has been acked as part > of the series at [1]. > > Pathces 2 and 3 add the physical status and a BMC flag to struct > drm_connector. Usually physical connector status and regular, logical > status are in sync, so nothing changes for most drivers. If the the > BMC flag has been set, the logical status is always connected. The > probe helpers also take care of sending hotplug events if the physical > status changes. > > Patches 4 to 7 update ast and mgag200. Both drivers already implement > their own tracking of physical status, which is now handled by DRM > helpers. Ast also receives two simple bug fixes for cleaning up EDID > properties in the BMC case. > > Tested on ast and mgag200 hardware. Another driver that could make use > of this functionality is hibmc. Generally speaking, it looks ok, but given how much of a corner case it is, we should have kunit tests to cover the whole thing. Maxime
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