[PATCH v4 00/11] drm: Add support for bus-format negotiation

[Boris Brezillon <boris.brezillon@collabora.com>]

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 v4. I think I addressed all comments I got
from Neil and Laurent (thanks for the detailed reviews BTW). 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

[1]https://github.com/bbrezillon/linux-0day/commits/drm-bridge-busfmt-v4

Boris Brezillon (11):
  drm/bridge: Rename bridge helpers targeting a bridge chain
  drm/bridge: Introduce drm_bridge_get_next_bridge()
  drm: Stop accessing encoder->bridge directly
  drm/bridge: Make the bridge chain a double-linked list
  drm/bridge: Add the drm_for_each_bridge_in_chain() helper
  drm/bridge: Add the drm_bridge_get_prev_bridge() helper
  drm/bridge: Clarify the atomic enable/disable hooks semantics
  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           |  53 +-
 drivers/gpu/drm/drm_bridge.c                  | 756 +++++++++++++++---
 drivers/gpu/drm/drm_encoder.c                 |  15 +-
 drivers/gpu/drm/drm_probe_helper.c            |   4 +-
 drivers/gpu/drm/exynos/exynos_drm_dsi.c       |  13 +-
 drivers/gpu/drm/mediatek/mtk_hdmi.c           |   8 +-
 drivers/gpu/drm/msm/edp/edp_bridge.c          |  10 +-
 drivers/gpu/drm/omapdrm/omap_drv.c            |   4 +-
 drivers/gpu/drm/omapdrm/omap_encoder.c        |   3 +-
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c        |  10 +-
 drivers/gpu/drm/vc4/vc4_dsi.c                 |  18 +-
 include/drm/drm_atomic.h                      |   3 +
 include/drm/drm_bridge.h                      | 404 +++++++++-
 include/drm/drm_encoder.h                     |   7 +-
 16 files changed, 1174 insertions(+), 214 deletions(-)

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2.23.0