[PATCH v4 00/14] drm/tidss: Add BeagleY-AI display support (and some more)

Tomi Valkeinen tomi.valkeinen at ideasonboard.com
Thu Oct 29 03:18:46 PDT 2026 

This series aims to add display support for all display interfaces on
BeagleY-AI board. More generally, it adds display support for TI AM62P,
J722S, and related SoCs.

The main topics to highlight:

- The data and sync signal polarities require accessing a register
  (DPI0_CLK_CTRL) in the CTRL_MMR block. This has already been discussed
  e.g. in
  https://lore.kernel.org/all/20250730-fix-edge-handling-v1-0-1bdfb3fe7922%40bootlin.com/.
  This topic is still open, and it also touches already upstreamed SoCs
  with DSS (AM625). In other words, with this series, we don't have full
  polarity support, and DPI works exactly like upstream AM625's does.

- In the SoC, the two OLDI TX instances are shared between the two DSS
  instances. This has been a bit tricky to solve neatly. In this series
  the result is that in the DT we have three OLDI TX nodes, two under
  DSS0, one under DSS1, representing the OLDIs that the DSS instance
  can use.

- I'm no audio expert, but based on the original dts from Robert Nelson,
  I did get HDMI audio working, but I see "davinci-mcasp
  2b10000.audio-controller: Sample-rate is off by 400 PPM".

With this series one can use the HDMI output on BeagleY-AI. I have also
tested the DSI output with Raspberry Pi's 7" DSI display, and OLDI
output with an oscilloscope (I don't have a suitable OLDI panel) with
extra DT overlays.

 Tomi

Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ideasonboard.com>
---
Changes in v4:
- Based on today's drm-misc-next
- Dropped the CTRL MMR related code. This means the DPI polarities are
  not quite right (the same as AM625)
- Dropped the commit to convert OLDI to an aux driver. This version uses
  a new (unmerged) PM dev_pm_domain_attach_by_node() to manage the OLDI
  power domains.
- Dropped a bunch of commits which were merged via "[PATCH 00/10]
  drm/tidss: Preparation for AM62P and BeagleY-AI display support"
  series.
- Dropped tested-by tags, as the series has changed quite a bit.
- Includes new fixes and cleanup patches:
  - vp_bus_type removal: 
    - "Add helper to identify the AM65x OLDI video port"
    - "Stop using vp_bus_type for directly connected panels"
    - "Drop the tied off video port check from mode validation"
    - "Remove the unused vp_bus_type feat"
  - OLDI:
    - "Drop unnecessary forward declaration"
    - "Fix wrong return value from tidss_oldi_mode_valid()"
    - "Fix serial clock reference leak"
    - "Fix cleanup on a failed init"
    - "Move the setup of one OLDI TX to its own function"
    - "Add power domain support"
- Link to v3: https://patch.msgid.link/20260529-beagley-ai-display-v3-0-7fefdc5d1adf@ideasonboard.com

Changes in v3:
- Base on "[PATCH 0/6] arm64: ti: Use syscon for the Control Module"
- Drop quotation marks from Rb tags
- Drop Tested-by tags for the bindings patches
- "drm/tidss: Add external data and sync signal edge configuration": Fix
  error handling
- "drm/tidss: Add support for DPIENABLE bit": set/unset DPIENABLE in
  prepare/unprepare
- "drm/tidss: oldi: Convert OLDI to an aux driver": Improve cleanups
  (of_node_put, clk_put, device_link_del)
- Dropped "arm64: dts: ti: k3-am62p-j722s-common-main: Make main_conf a syscon"
- "arm64: dts: ti: k3-am62p-j722s-common-main: Add support for DSS": Add
  missing clocks and ti,oldi-io-ctrl for oldi1 node. Drop unused
  main-gpio0-ioexp-intr-default-pins node. Fix MCASP1_AXR0 pin
  direction. Fix DSS videoport numbering.
- Link to v2: https://lore.kernel.org/r/20260513-beagley-ai-display-v2-0-9e9bcefde6bc@ideasonboard.com

Changes in v2:
- Add Rb and Tb tags
- Drop "dt-bindings: mfd: syscon: Add ti,am625-dss-dpi0-clk-ctrl
  compatible", which is now implemented with the below changes.
- New patch "dt-bindings: display: ti,am65x-dss: Add ti,dpi-io-ctrl"
- Modify "drm/tidss: Add external data and sync signal edge
  configuration" to use the 'ti,dpi-io-ctrl' with offset.
- New patch "arm64: dts: ti: k3-am62p-j722s-common-main: Make main_conf
  a syscon".
- Modify "arm64: dts: ti: k3-am62p-j722s-common-main: Add support for
  DSS" to set 'ti,dpi-io-ctrl' properties
- Drop generic desc in DT bindings for power-domains property
- Fix pm_runtime_get_sync() return value check
- Link to v1: https://lore.kernel.org/r/20260420-beagley-ai-display-v1-0-f628543dfd14@ideasonboard.com

---
Andrew Davis (1):
      arm64: dts: ti: beagley-ai: Enable HDMI display and audio

Jayesh Choudhary (1):
      arm64: dts: ti: k3-am62p-j722s-common-main: Add support for DSS

Swamil Jain (1):
      drm/tidss: Add support for AM62P display subsystem

Tomi Valkeinen (11):
      dt-bindings: display: ti,am65x-dss: Add AM62P DSS
      drm/tidss: Add helper to identify the AM65x OLDI video port
      drm/tidss: Stop using vp_bus_type for directly connected panels
      drm/tidss: Drop the tied off video port check from mode validation
      drm/tidss: Remove the unused vp_bus_type feat
      drm/tidss: oldi: Drop unnecessary forward declaration
      drm/tidss: oldi: Fix wrong return value from tidss_oldi_mode_valid()
      drm/tidss: oldi: Fix serial clock reference leak
      drm/tidss: oldi: Fix cleanup on a failed init
      drm/tidss: oldi: Move the setup of one OLDI TX to its own function
      drm/tidss: oldi: Add power domain support

 .../bindings/display/ti/ti,am65x-dss.yaml          |  27 ++
 .../boot/dts/ti/k3-am62p-j722s-common-main.dtsi    | 110 +++++++
 arch/arm64/boot/dts/ti/k3-am62p.dtsi               |  16 +
 arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts     | 180 +++++++++++
 arch/arm64/boot/dts/ti/k3-j722s.dtsi               |  16 +
 drivers/gpu/drm/tidss/tidss_dispc.c                |  23 +-
 drivers/gpu/drm/tidss/tidss_dispc.h                |  16 +-
 drivers/gpu/drm/tidss/tidss_drv.c                  |   1 +
 drivers/gpu/drm/tidss/tidss_kms.c                  |  13 +-
 drivers/gpu/drm/tidss/tidss_oldi.c                 | 356 +++++++++++++--------
 drivers/gpu/drm/tidss/tidss_oldi.h                 |   2 -
 11 files changed, 593 insertions(+), 167 deletions(-)
---
base-commit: 33ed26235db93162935d1719bc6f538c384a2fd8
change-id: 20260420-beagley-ai-display-d7f634cde5f4
prerequisite-message-id: 20260907-cdns-dsi-fixes-v2-0-96d9b116e9bc at ideasonboard.com
prerequisite-patch-id: 22251f03ea9147feb3270bb8ecf5d08169ddf7a6
prerequisite-patch-id: 667af0055a8a26880d810f1a246202dde3b4b9fb
prerequisite-patch-id: 76b566286279f3544096c32a34d757ac47ff77d6
prerequisite-message-id: 20261015-tc358762-fixes-v5-0-7cd721a6451b at ideasonboard.com
prerequisite-patch-id: df4c4c2ab36f4504f08fd89804c91ecf1bbc5b85
prerequisite-patch-id: d270eb332c88f888f628b2cf751517500024b12c
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prerequisite-patch-id: 84cf0fc416da9a016ebbd586020cb67b18aa84b7
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prerequisite-patch-id: c6c3d34380425f4ee21411e860726786b56c8236
prerequisite-patch-id: ac1f5d7bc054cf7a0d84cb343f4b1d1e393a7956
prerequisite-message-id: 20261023-pm_attach_by_node-v1-1-4dbaccdf8b0e at ideasonboard.com
prerequisite-patch-id: 154b9cfd53b351e7d7617322e436dcf3db3413b3
prerequisite-message-id: 20261016-attiny-probe-fix-v1-1-96337ba58dfa at ideasonboard.com
prerequisite-patch-id: 45efa9d7ccd75f4a0b5c6868fe8ab369cd83303e

Best regards,
--  
Tomi Valkeinen <tomi.valkeinen at ideasonboard.com>

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