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. Major changes since v2: * Get rid of the dummy bridge embedded in drm_encoder and let encoder drivers provide their own bridge element * Clarify APIs and improve the doc * Propagate bus flags by default Major changes since the RFC: * Add a dummy bridge to the drm_encoder object so that vc4 and exynos DSI drivers can implement the pre_enable/post_disable hooks instead of manually setting encoder->bridge to NULL to control the enable/disable sequence. This change is also a first step towards drm_bridge/drm_encoder unification. New encoder drivers should stop implementing drm_encoder_helper_funcs and switch to drm_bridge_funcs. Existing drivers can be converted progressively (already have a branch where I started converting some of them [1]) * rework the bus format negotiation to give more control to bridge drivers in the selection process (driver can select at runtime which input bus format they support for a specific output bus format based on any information available in the connector, crtc and bridge state. A more detailed changelog is provided in each patch. This patch series is also available here [2]. Thanks, Boris [1]https://github.com/bbrezillon/linux-0day/commits/drm-encoder-bridge [2]https://github.com/bbrezillon/linux-0day/commits/drm-bridge-busfmt-v3 *** BLURB HERE *** Boris Brezillon (21): drm/vc4: Declare the DSI encoder as a bridge element drm/exynos: Don't reset bridge->next drm/exynos: Declare the DSI encoder as a bridge element drm/bridge: Rename bridge helpers targeting a bridge chain drm/bridge: Introduce drm_bridge_chain_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 a drm_bridge_state object drm/bridge: Clarify the atomic enable/disable hooks semantics drm/bridge: Patch atomic hooks to take a drm_bridge_state drm/bridge: Add an ->atomic_check() hook drm/bridge: Add the drm_bridge_chain_get_prev_bridge() helper 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-encoder: Implement basic bus format negotiation dt-bindings: display: bridge: lvds-transmitter: Add new props drm/bridge: panel: Propage bus format/flags drm/panel: simple: Add support for Toshiba LTA089AC29000 panel dt-bindings: display: panel: Add the LTA089AC29000 variant ARM: dts: imx: imx51-zii-rdu1: Fix the display pipeline definition .../display/bridge/lvds-transmitter.txt | 13 + .../display/panel/toshiba,lt089ac29000.txt | 5 +- arch/arm/boot/dts/imx51-zii-rdu1.dts | 24 +- .../drm/bridge/analogix/analogix_dp_core.c | 12 +- drivers/gpu/drm/bridge/lvds-encoder.c | 72 ++ drivers/gpu/drm/bridge/panel.c | 1 + drivers/gpu/drm/drm_atomic.c | 39 + drivers/gpu/drm/drm_atomic_helper.c | 54 +- drivers/gpu/drm/drm_bridge.c | 800 +++++++++++++++--- drivers/gpu/drm/drm_encoder.c | 15 +- drivers/gpu/drm/drm_probe_helper.c | 4 +- drivers/gpu/drm/exynos/exynos_dp.c | 1 - drivers/gpu/drm/exynos/exynos_drm_dsi.c | 90 +- drivers/gpu/drm/imx/parallel-display.c | 174 +++- 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/panel/panel-simple.c | 36 + drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 11 +- drivers/gpu/drm/vc4/vc4_dsi.c | 90 +- include/drm/drm_atomic.h | 3 + include/drm/drm_bridge.h | 396 ++++++++- include/drm/drm_encoder.h | 9 +- 24 files changed, 1588 insertions(+), 286 deletions(-) -- 2.21.0
