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(-) -- 2.22.0
