[RFC 0/2] drm/connector: connector iterator with filtering

[Jani Nikula]

On Wed, 05 Oct 2022, Jani Nikula <jani.nikula at intel.com> wrote:
> Currently i915 assumes all drm_connectors it encounters are embedded in
> intel_connectors that i915 allocated. The drm_writeback_connector forces
> a design where this is not the case; we can't provide our own connector,
> and writeback embeds the drm_connector it initializes itself.
>
> To use drm writeback, none of the i915 connector iteration could assume
> the drm connector is embedded in intel_connector. Checking this is
> tedious, and would require an intermediate step with
> drm_connector. Here's an idea I came up with; filtering at the drm
> connector iterator level with a caller supplied function. Not too much
> code, and could be used for other things as well.
>
> Mind you, we'd still much rather modify drm writeback to allow passing
> the connector i915 allocated, instead of the current midlayer design
> that forces drivers to a certain model. Working around this is a bunch
> of error prone and tedious code that we really could do without.

Any feedback on this one?

BR,
Jani.

>
>
> BR,
> Jani.
>
>
> Cc: Arun R Murthy <arun.r.murthy at intel.com>
> Cc: Dave Airlie <airlied at gmail.com>
> Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> Cc: Suraj Kandpal <suraj.kandpal at intel.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Jani Nikula (2):
>   drm/connector: add connector list iteration with filtering
>   drm/i915: iterate intel_connectors only
>
>  drivers/gpu/drm/drm_connector.c               | 57 +++++++++++++++----
>  drivers/gpu/drm/i915/display/intel_display.c  |  3 +-
>  .../drm/i915/display/intel_display_types.h    |  7 +++
>  drivers/gpu/drm/i915/display/intel_dp.c       |  6 +-
>  drivers/gpu/drm/i915/display/intel_dp_mst.c   |  3 +-
>  drivers/gpu/drm/i915/display/intel_hdcp.c     |  3 +-
>  drivers/gpu/drm/i915/display/intel_hotplug.c  | 12 ++--
>  .../drm/i915/display/intel_modeset_setup.c    |  6 +-
>  drivers/gpu/drm/i915/display/intel_opregion.c |  9 ++-
>  include/drm/drm_connector.h                   |  9 +++
>  10 files changed, 89 insertions(+), 26 deletions(-)

-- 
Jani Nikula, Intel Open Source Graphics Center