[PATCH v6 0/7] drm/bridge: Implement generic USB Type-C DP HPD bridge

From: Chaoyi Chen <[email protected]>

This series is split from the v15 "Add Type-C DP support for RK3399 EVB
IND board" series [1]. It focuses on the DRM bridge and Rockchip
platform CDN-DP controller changes.

[1] https://lore.kernel.org/all/[email protected]/

====
1. Generic Type-C DP HPD bridge

Currently, several USB-C controller drivers register their own DP HPD
bridge via aux-hpd-bridge.c, each duplicating the same logic. For
devicetree based platforms, the USB-C controller may vary across boards,
and not every USB-C controller driver implements this feature. Patch 1
implements a generic DP HPD bridge that monitors Type-C bus events and
automatically creates an HPD bridge when a Type-C port device with DP
SVID is registered.

2. Multiple bridge model for CDN-DP

The RK3399 has two USB/DP combo PHY and one CDN-DP controller. Patch 5
introduces a multi-bridge model where each PHY port gets a separate
encoder and bridge, allowing flexible selection of the output PHY port.
This is based on the DRM AUX HPD bridge rather than extcon.

====
Patch 1 adds new API to check whether a DisplayPort HPD bridge has
	already been registered(Sebastian).
Patch 2 adds generic USB Type-C DP HPD bridge (Dmitry, Heikki).
Patch 3 adds module soft depend for USB Type-C DP HPD bridge(Sebastian).
Patch 4 adds new API drm_aux_bridge_register_from_node() (Neil).
Patch 5 adds DRM AUX bridge support for RK3399 USBDP PHY (Neil).
Patch 6 drops CDN-DP's extcon dependency when Type-C is present (Dmitry).
Patch 7 adds multiple bridges to support PHY port selection (Dmitry, Luca).

Changes in v6:
- Link to v5: https://lore.kernel.org/all/[email protected]/
- Avoid duplicate registration of the same DisplayPort HPD bridge.

Changes in v5:
- Link to v4: https://lore.kernel.org/all/[email protected]/
- Add module soft depend for USB Type-C DP HPD bridge.

Changes in v4:
- Link to v3: https://lore.kernel.org/all/[email protected]/
- Scan the entire typec_bus and attempt to register the hpd bridge,
  so as not to miss devices that were already added during initialization.

Changes in v3:
- Link to v2: https://lore.kernel.org/all/[email protected]/
  (Sorry, I forgot to add the "v2" title, so it looks like v1.)
- Remove now-redundant call to drm_connector_attach_encoder()
- Rebase to v7.2-rc2

Changes in v2:
- Link to v1: https://lore.kernel.org/all/[email protected]/
- Add copyright text.
- Remove useless goto.
- Fix incorrect function names in the documentation comments.
- Fix the check logic for dp->active_port (0 is valid).
- Fix the uninitialized prev_port.
- Remove duplicate logic from cdn_dp_switch_port().
- Fix the prototype of cdn_dp_bridge_hpd_notify().
- Properly release connector->fwnode.
- Properly release next_bridge.

Chaoyi Chen (7):
  drm/bridge: aux-hpd-bridge: Add drm_dev_has_dp_hpd_bridge()
  drm/bridge: Implement generic USB Type-C DP HPD bridge
  drm/display: Add soft depend for aux-hpd-typec-dp-bridge module
  drm/bridge: aux: Add drm_aux_bridge_register_from_node()
  phy: rockchip: phy-rockchip-typec: Add DRM AUX bridge
  drm/rockchip: cdn-dp: Support handle lane info without extcon
  drm/rockchip: cdn-dp: Add multiple bridges to support PHY port
    selection

 drivers/gpu/drm/bridge/Kconfig                |  10 +
 drivers/gpu/drm/bridge/Makefile               |   1 +
 drivers/gpu/drm/bridge/aux-bridge.c           |  26 +-
 drivers/gpu/drm/bridge/aux-hpd-bridge.c       |  42 +-
 .../gpu/drm/bridge/aux-hpd-typec-dp-bridge.c  |  67 ++++
 .../gpu/drm/display/drm_display_helper_mod.c  |   1 +
 drivers/gpu/drm/rockchip/Kconfig              |   1 +
 drivers/gpu/drm/rockchip/cdn-dp-core.c        | 358 ++++++++++++++----
 drivers/gpu/drm/rockchip/cdn-dp-core.h        |  18 +-
 drivers/phy/rockchip/Kconfig                  |   2 +
 drivers/phy/rockchip/phy-rockchip-typec.c     |  13 +-
 include/drm/bridge/aux-bridge.h               |  12 +
 12 files changed, 479 insertions(+), 72 deletions(-)
 create mode 100644 drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c

--
2.53.0


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