[PATCH v10 00/12] drm: Add support for bus-format negotiation

From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Andrey Smirnov <andrew.smirnov@gmail.com>,
	Jonas Karlman <jonas@kwiboo.se>, Rob Herring <robh+dt@kernel.org>,
	Andrzej Hajda <a.hajda@samsung.com>,
	devicetree@vger.kernel.org,
	Thierry Reding <thierry.reding@gmail.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Boris Brezillon <boris.brezillon@collabora.com>,
	intel-gfx-trybot@lists.freedesktop.org, kernel@collabora.com,
	Sam Ravnborg <sam@ravnborg.org>, Chris Healy <cphealy@gmail.com>
Subject: [PATCH v10 00/12] drm: Add support for bus-format negotiation
Date: Tue, 28 Jan 2020 14:55:02 +0100	[thread overview]
Message-ID: <20200128135514.108171-1-boris.brezillon@collabora.com> (raw)

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.

No fundamental changes in this v10, just collected R-bs, addressed
Philipp's comments and moved the changelog back to the visible part
of the commit message.

I plan to apply patches 1 to 7 soon, so if there's anything you don't
like in there, please say it now. Still waiting for review on the LVDS
bridge and panel stuff.

This patch series is also available here [1].

Thanks,

Boris

[1]https://github.com/bbrezillon/linux-0day/commits/drm-bridge-busfmt-v10

Boris Brezillon (12):
  drm/bridge: Add a drm_bridge_state object
  drm/rcar-du: Plug atomic state hooks to the default implementation
  drm/bridge: analogix: Plug atomic state hooks to the default
    implementation
  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/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     | 103 +++++
 drivers/gpu/drm/drm_bridge.c                  | 437 +++++++++++++++++-
 drivers/gpu/drm/imx/parallel-display.c        | 177 ++++++-
 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                      | 179 ++++++-
 16 files changed, 1258 insertions(+), 81 deletions(-)

-- 
2.24.1

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