[PATCH v5 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.

Already applied patch from v4 were removed.
No Major changes in this v5, I addressed the slight changed requested
by Laurent on the patch 1. 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-v5

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                  | 557 +++++++++++++++++-
 include/drm/drm_atomic.h                      |   3 +
 include/drm/drm_bridge.h                      | 281 ++++++++-
 6 files changed, 907 insertions(+), 46 deletions(-)

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2.22.0