[PATCH v8 00/12] drm: Add support for bus-format negotiation

[Boris Brezillon]

Hello,

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.

Two new fixes in this v8, one moving functions out of a ifdef
CONFIG_DEBUGFS section and another fixing a check in
drm_atomic_bridge_chain_select_bus_fmts(). 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-v8

Boris Brezillon (12):
  drm/bridge: Add a drm_bridge_state object
  drm/bridge: Patch atomic hooks to take a drm_bridge_state
  drm/rcar-du: Plug atomic state hooks to the default implementation
  drm/bridge: analogix: Plug atomic state hooks to the default
    implementation
  drm/bridge: Add an ->atomic_check() hook
  drm/bridge: Add the necessary bits to support bus format negotiation
  drm/imx: pd: Use bus format/flags provided by the bridge when
    available
  drm/bridge: lvds-codec: Implement basic bus format negotiation
  dt-bindings: display: bridge: lvds-codec: Add new bus-width prop
  drm/bridge: panel: Propage bus format/flags
  drm/panel: simple: Fix the lt089ac29000 bus_format
  ARM: dts: imx: imx51-zii-rdu1: Fix the display pipeline definition

 .../bindings/display/bridge/lvds-codec.yaml   |   8 +
 arch/arm/boot/dts/imx51-zii-rdu1.dts          |  24 +-
 .../drm/bridge/analogix/analogix_dp_core.c    |  44 +-
 drivers/gpu/drm/bridge/lvds-codec.c           |  64 ++-
 drivers/gpu/drm/bridge/panel.c                |   4 +
 drivers/gpu/drm/drm_atomic.c                  | 116 +++++
 drivers/gpu/drm/drm_atomic_helper.c           |  73 +++-
 drivers/gpu/drm/drm_atomic_state_helper.c     | 131 ++++++
 drivers/gpu/drm/drm_bridge.c                  | 407 +++++++++++++++++-
 drivers/gpu/drm/imx/parallel-display.c        | 176 ++++++--
 drivers/gpu/drm/panel/panel-simple.c          |   2 +-
 drivers/gpu/drm/rcar-du/rcar_lvds.c           |  11 +-
 include/drm/drm_atomic.h                      |  76 ++++
 include/drm/drm_atomic_helper.h               |   8 +
 include/drm/drm_atomic_state_helper.h         |  13 +
 include/drm/drm_bridge.h                      | 172 +++++++-
 16 files changed, 1248 insertions(+), 81 deletions(-)

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2.24.1