[v2,00/21] drm: Add support for bus-format negotiation

Message

Boris Brezillon Aug. 26, 2019, 3:26 p.m. UTC

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 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-drm-bridge-busfmt-v2

Boris Brezillon (21):
  drm: Stop including drm_bridge.h from drm_crtc.h
  drm: Add a dummy bridge object to drm_encoder
  drm/vc4: Implement bridge_funcs instead of encoder_helper_funcs
  drm/exynos: Fix potential unbalanced calls to pm_runtime_put
  drm/exynos: Don't reset bridge->next
  drm/exynos: Implement bridge_funcs instead of encoder_helper_funcs
  drm/bridge: Rename bridge helpers targeting a bridge chain
  drm/msm: Use drm_attach_bridge() to attach a bridge to an encoder
  drm/bridge: Introduce drm_bridge_chain_get_next_bridge()
  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: 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
  drm/bridge: panel: Propage bus format/flags
  drm/panel: simple: Add support for Toshiba LTA089AC29000 panel
  ARM: dts: imx: imx51-zii-rdu1: Fix the display pipeline definition

 .../display/bridge/lvds-transmitter.txt       |  12 +
 .../display/panel/toshiba,lt089ac29000.txt    |   5 +-
 arch/arm/boot/dts/imx51-zii-rdu1.dts          |  24 +-
 drivers/gpu/drm/arc/arcpgu_hdmi.c             |   1 +
 drivers/gpu/drm/bridge/analogix-anx78xx.c     |   1 +
 .../drm/bridge/analogix/analogix_dp_core.c    |  13 +-
 drivers/gpu/drm/bridge/dumb-vga-dac.c         |   1 +
 drivers/gpu/drm/bridge/lvds-encoder.c         | 105 +++
 .../bridge/megachips-stdpxxxx-ge-b850v3-fw.c  |   1 +
 drivers/gpu/drm/bridge/nxp-ptn3460.c          |   1 +
 drivers/gpu/drm/bridge/panel.c                |  31 +
 drivers/gpu/drm/bridge/parade-ps8622.c        |   1 +
 drivers/gpu/drm/bridge/sii902x.c              |   1 +
 drivers/gpu/drm/bridge/sii9234.c              |   1 +
 drivers/gpu/drm/bridge/sil-sii8620.c          |   1 +
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     |   1 +
 drivers/gpu/drm/bridge/tc358764.c             |   1 +
 drivers/gpu/drm/bridge/tc358767.c             |   1 +
 drivers/gpu/drm/bridge/ti-sn65dsi86.c         |   1 +
 drivers/gpu/drm/bridge/ti-tfp410.c            |   1 +
 drivers/gpu/drm/drm_atomic.c                  |  39 +
 drivers/gpu/drm/drm_atomic_helper.c           |  46 +-
 drivers/gpu/drm/drm_bridge.c                  | 749 ++++++++++++++----
 drivers/gpu/drm/drm_crtc_helper.c             |  29 +-
 drivers/gpu/drm/drm_encoder.c                 |  26 +-
 drivers/gpu/drm/drm_probe_helper.c            |   3 +-
 drivers/gpu/drm/drm_simple_kms_helper.c       |   1 +
 drivers/gpu/drm/exynos/exynos_dp.c            |   2 +-
 drivers/gpu/drm/exynos/exynos_drm_dsi.c       |  70 +-
 drivers/gpu/drm/exynos/exynos_drm_mic.c       |   1 +
 drivers/gpu/drm/exynos/exynos_hdmi.c          |   1 +
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c     |   1 +
 drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c  |   1 +
 drivers/gpu/drm/i2c/tda998x_drv.c             |   1 +
 drivers/gpu/drm/imx/imx-ldb.c                 |   1 +
 drivers/gpu/drm/imx/parallel-display.c        | 137 +++-
 drivers/gpu/drm/ingenic/ingenic-drm.c         |   1 +
 drivers/gpu/drm/mediatek/mtk_dpi.c            |   1 +
 drivers/gpu/drm/mediatek/mtk_dsi.c            |   1 +
 drivers/gpu/drm/mediatek/mtk_hdmi.c           |   9 +-
 drivers/gpu/drm/msm/dsi/dsi.h                 |   1 +
 drivers/gpu/drm/msm/edp/edp.c                 |   4 +-
 drivers/gpu/drm/msm/edp/edp.h                 |   1 +
 drivers/gpu/drm/msm/edp/edp_bridge.c          |  10 +-
 drivers/gpu/drm/msm/hdmi/hdmi.c               |   4 +-
 drivers/gpu/drm/msm/hdmi/hdmi.h               |   2 +
 drivers/gpu/drm/omapdrm/dss/output.c          |   1 +
 drivers/gpu/drm/omapdrm/omap_drv.c            |   5 +-
 drivers/gpu/drm/omapdrm/omap_encoder.c        |   4 +-
 drivers/gpu/drm/panel/panel-simple.c          |  36 +
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c        |  10 +-
 drivers/gpu/drm/rcar-du/rcar_du_encoder.c     |   1 +
 drivers/gpu/drm/rockchip/rockchip_lvds.c      |   1 +
 drivers/gpu/drm/rockchip/rockchip_rgb.c       |   1 +
 drivers/gpu/drm/sti/sti_dvo.c                 |   1 +
 drivers/gpu/drm/sti/sti_hda.c                 |   1 +
 drivers/gpu/drm/sti/sti_hdmi.c                |   1 +
 drivers/gpu/drm/sun4i/sun4i_lvds.c            |   1 +
 drivers/gpu/drm/sun4i/sun4i_rgb.c             |   1 +
 drivers/gpu/drm/sun4i/sun4i_tcon.c            |   1 +
 drivers/gpu/drm/tilcdc/tilcdc_external.c      |   1 +
 drivers/gpu/drm/vc4/vc4_dsi.c                 |  73 +-
 include/drm/drm_atomic.h                      |   3 +
 include/drm/drm_bridge.h                      | 335 +++++++-
 include/drm/drm_crtc.h                        |   1 -
 include/drm/drm_encoder.h                     |  23 +-
 66 files changed, 1533 insertions(+), 314 deletions(-)