Re: [PATCH 00/15] drm/tidss: Add BeagleY-AI display support (and some more)

[Swamil Jain <s-jain1@ti.com>]

On 20-04-2026 18:24, Tomi Valkeinen wrote:
> 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, and, as a bit extra, improves AM62L's DPI
> handling.
> 
> The main topics to highlight:
> 
> - The ti,am625-dss-dpi0-clk-ctrl feels a bit like a hack.
>    But it is a single quirk register, among other registers that belong
>    to either the firmware or other drivers. So what other options are
>    there? This has already been discussed e.g. in
>    https://lore.kernel.org/all/20250730-fix-edge-handling-v1-0-1bdfb3fe7922%40bootlin.com/
>    without proper conclusion.
> 
> - The tidss OLDI support will now use auxiliary device/driver. This seems
>    to solve quite neatly the requirement to have a power-domain for each
>    OLDI. The main issue that remains is that on AM62P (and similar) we
>    will have three OLDI TX DT nodes, even if there are only two in the
>    hardware.
> 
> 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).
> 
>   Tomi
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> ---

The series is tested on TI's AM62P[1] SoC and tested HDMI display and
audio output with BeagleY-AI(AM67A SoC[2]).

Display panels used:
--------------------

DSI Panel: https://www.raspberrypi.com/products/raspberry-pi-touch-display/
OLDI Panel: https://www.ti.com/tool/SK-LCD1
HDMI Panel: https://www.viewsonic.com/in/products/lcd/VA1655-3

Test branch: 
https://github.com/jainswamil/linux-next/tree/AM62P_J722S_BEAGLEY_AI_DSS_V1_TEST

Got some DT check warnings with the above test branch[3].

Links
[1]: https://www.ti.com/product/AM62P
[2]: https://www.ti.com/product/AM67A
[3]: https://gist.github.com/jainswamil/945a9859c0f75b41ef21abeede405b2e

Tested-by: Swamil Jain <s-jain1@ti.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 (12):
>        dt-bindings: display: ti: Move ti,am62l-dss binding to a new binding file
>        dt-bindings: display: ti,am65x-dss: Simplify binding
>        dt-bindings: mfd: syscon: Add ti,am625-dss-dpi0-clk-ctrl compatible
>        dt-bindings: display: ti,am625-oldi: Add optional power-domain for OLDI
>        dt-bindings: display: ti,am65x-dss: Add AM62P DSS
>        drm/tidss: Remove extra pm_runtime_mark_last_busy
>        drm/tidss: oldi: Remove define for unused register OLDI_LB_CTRL
>        drm/tidss: Add mechanism to detect DPI output
>        drm/tidss: Add external data and sync signal edge configuration
>        drm/tidss: Add support for DPIENABLE bit
>        drm/tidss: oldi: Fix OLDI signal polarities
>        drm/tidss: oldi: Convert OLDI to an aux driver
> 
>   .../bindings/display/ti/ti,am625-oldi.yaml         |   4 +
>   .../bindings/display/ti/ti,am62l-dss.yaml          | 136 ++++++
>   .../bindings/display/ti/ti,am65x-dss.yaml          | 176 +++----
>   Documentation/devicetree/bindings/mfd/syscon.yaml  |   2 +
>   MAINTAINERS                                        |   1 +
>   .../boot/dts/ti/k3-am62p-j722s-common-main.dtsi    | 112 +++++
>   arch/arm64/boot/dts/ti/k3-am62p.dtsi               |  16 +
>   arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts     | 197 ++++++++
>   arch/arm64/boot/dts/ti/k3-j722s.dtsi               |  16 +
>   drivers/gpu/drm/tidss/tidss_crtc.c                 |  10 +-
>   drivers/gpu/drm/tidss/tidss_crtc.h                 |   4 +-
>   drivers/gpu/drm/tidss/tidss_dispc.c                |  46 +-
>   drivers/gpu/drm/tidss/tidss_dispc.h                |   5 +-
>   drivers/gpu/drm/tidss/tidss_dispc_regs.h           |   5 +
>   drivers/gpu/drm/tidss/tidss_drv.c                  |  54 ++-
>   drivers/gpu/drm/tidss/tidss_drv.h                  |   5 +-
>   drivers/gpu/drm/tidss/tidss_kms.c                  |  55 ++-
>   drivers/gpu/drm/tidss/tidss_oldi.c                 | 531 +++++++++++++++------
>   drivers/gpu/drm/tidss/tidss_oldi.h                 |   8 +-
>   19 files changed, 1095 insertions(+), 288 deletions(-)
> ---
> base-commit: 3131ff5a117498bb4b9db3a238bb311cbf8383ce
> change-id: 20260420-beagley-ai-display-d7f634cde5f4
> prerequisite-message-id: <20260415110409.2577633-1-s-jain1@ti.com>
> prerequisite-patch-id: 654d90f9cddec8b41e6fb1b3776a632606fef88c
> 
> Best regards,