[PATCH v6 0/4] drm: Add support for bus-format negotiation

[Neil Armstrong]

This patch series aims at adding support for runtime bus-format
negotiation between all elements of the
'encoder -> bridges -> connector/display' section of the pipeline.

In order to support that, we need drm bridges to fully take part in the
atomic state validation process, which requires adding a
drm_bridge_state and a new drm_bridge_funcs.atomic_check() hook.
Once those basic building blocks are in place, we can add new hooks to
allow bus format negotiation (those are called just before
->atomic_check()). The bus format selection is done at runtime by
testing all possible combinations across the whole bridge chain until
one is reported to work.

No Major changes in this v6, I addressed the slight changed requested
by Boris from Laurent on the patch 1, and rebased on drm-misc-next. 
Note that this version only contains core changes.
Once those changes are merged I'll send the imx/panel/lvds-codec specific bits.

A more detailed changelog is provided in each patch.

This patch series is also available here [1].

Thanks,

~Boris~ Neil

[1] https://github.com/superna9999/linux/commits/drm-bridge-busfmt-v6

Boris Brezillon (4):
  drm/bridge: Add a drm_bridge_state object
  drm/bridge: Patch atomic hooks to take a drm_bridge_state
  drm/bridge: Add an ->atomic_check() hook
  drm/bridge: Add the necessary bits to support bus format negotiation

 .../drm/bridge/analogix/analogix_dp_core.c    |  41 +-
 drivers/gpu/drm/drm_atomic.c                  |  39 ++
 drivers/gpu/drm/drm_atomic_helper.c           |  32 +-
 drivers/gpu/drm/drm_bridge.c                  | 527 +++++++++++++++++-
 drivers/gpu/drm/rcar-du/rcar_lvds.c           |   5 +-
 include/drm/drm_atomic.h                      |   3 +
 include/drm/drm_bridge.h                      | 275 ++++++++-
 7 files changed, 874 insertions(+), 48 deletions(-)

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2.22.0