[RFC][PATCH 0/2] drm: PATH prop for all connectors?

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at 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 at ffwll.ch>
Cc: Pekka Paalanen <ppaalanen at gmail.com>
Cc: Ilia Mirkin <imirkin at 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(-)

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2.21.0