From: Ville Syrjälä ville.syrjala@linux.intel.com
Here's a possible apporoach for providing userspace with some stable connector identifiers. Combine with the bus name of the GPU and you should have some kind of real physical path description. Unfortunately the ship has sailed for MST connectors because userspace is already parsing the property and expects to find certain things there. So if we want stable names for those we'd probably have introduce another PATH prop (PHYS_PATH?).
I suppose one alternative would to make the connector type_id stable. Currently that is being populated by drm core and it's just a global counter. Not sure how badly things would turn out if we'd allow each driver to set that. It could result in conflicting xrandr connector names between different GPUs which I suppose would confuse existing userspace?
Cc: Daniel Vetter daniel@ffwll.ch Cc: Pekka Paalanen ppaalanen@gmail.com Cc: Ilia Mirkin imirkin@alum.mit.edu
Ville Syrjälä (2): drm: Improve PATH prop docs drm/i915: Populate PATH prop for every connector
drivers/gpu/drm/drm_connector.c | 13 ++++++++-- drivers/gpu/drm/i915/icl_dsi.c | 3 +++ drivers/gpu/drm/i915/intel_connector.c | 20 +++++++++++++++ drivers/gpu/drm/i915/intel_connector.h | 3 +++ drivers/gpu/drm/i915/intel_crt.c | 2 ++ drivers/gpu/drm/i915/intel_dp.c | 6 ++++- drivers/gpu/drm/i915/intel_dp_mst.c | 3 +-- drivers/gpu/drm/i915/intel_dvo.c | 3 +++ drivers/gpu/drm/i915/intel_hdmi.c | 4 +++ drivers/gpu/drm/i915/intel_lvds.c | 2 ++ drivers/gpu/drm/i915/intel_sdvo.c | 35 ++++++++++++++++++-------- drivers/gpu/drm/i915/intel_tv.c | 2 ++ drivers/gpu/drm/i915/vlv_dsi.c | 3 +++ 13 files changed, 83 insertions(+), 16 deletions(-)