Re: [PATCH 0/2] arm64: dts: allwinner: h616: add HDMI device tree nodes

["Jernej Škrabec" <jernej.skrabec@gmail.com>]

Dne petek, 4. september 2026 ob 23:33:27 Srednjeevropski poletni čas je Barzin Lotfabadi napisal(a):
> Hi all,
> 
> These two patches add the device tree nodes needed for HDMI output on the
> Allwinner H616 family.  Tested on an Orange Pi Zero 3 (H618, 4GB), which
> drives a 1920x1080@60Hz desktop with these applied.
> 
> Mainline already has DE33 mixer support in the sun4i driver, but there are
> no display nodes at all in sun50i-h616.dtsi, so nothing probes.  Ryan
> Walklin's "arm64: dts: allwinner: h616: add LCD timing controller and
> display engine support" series adds the display engine, bus, mixer and TCON
> nodes, but states that HDMI output is not provided.  These patches are the
> missing HDMI half.
> 
> Every register address, clock index and reset line was read out of the
> vendor device tree shipped with the board and translated to the mainline
> dt-bindings macros; the clock and reset numbering was verified identical
> between the vendor and mainline CCU headers before substitution.
> 
> Two things I would appreciate guidance on:
> 
> 1. Patch 1 currently also adds the display engine, bus, mixer and TCON
>    nodes, because Ryan's series has not landed and the HDMI nodes need
>    something to attach to.  If his series is merged first, I am happy to
>    respin this as an HDMI-only delta on top of it.  That is probably the
>    right shape; I did not want to post a series that applies to nothing in
>    the meantime.
> 
> 2. These nodes alone are not sufficient for a picture.  Two driver changes
>    are also needed: an H616 variant in sun8i_hdmi_phy.c (only
>    a83t/h3/r40/a64/h6 exist today), and setting the TCON pad select bit in
>    sun4i_tcon.c.  Both exist in the Armbian sunxi-6.12 tree, authored by
>    The-going.  I have deliberately not included them here, because I cannot
>    provide a Signed-off-by on another developer's work.  If someone in a
>    position to carry those forward would like to, I am happy to help test.
>    Without them these nodes probe but produce no output.
> 
> checkpatch is clean apart from one 103-column warning on a remote-endpoint
> line in patch 1; the identical construct at the same width already exists in
> sun50i-h6.dtsi:183, so I left it matching the surrounding convention.
> 
> One implementation note worth recording, since it cost a boot cycle: the
> DE33 mixer's three register regions must be named "layers", "top" and
> "display".  The driver fetches the latter two by name, so a wrong name here
> surfaces as "invalid resource (null)" and a -EINVAL bind failure several
> layers away from the cause.
> 
> Result on the board, with the two driver patches also applied:
> 
>   sun4i-drm display-engine: bound 1100000.mixer (ops sun8i_mixer_ops)
>   sun4i-drm display-engine: bound 6510000.tcon-top (ops sun8i_tcon_top_ops)
>   sun4i-drm display-engine: bound 6515000.lcd-controller (ops sun4i_tcon_ops)
>   sun8i-dw-hdmi 6000000.hdmi: Detected HDMI TX controller v2.12a with HDCP
>   sun4i-drm display-engine: bound 6000000.hdmi (ops sun8i_dw_hdmi_ops)
>   [drm] Initialized sun4i-drm 1.0.0 for display-engine on minor 0
> 
> with the connector reading "connected", EDID read correctly from the sink,
> and 1920x1080 among the reported modes.
> 
> Full boot logs, the decompiled vendor device tree the nodes were derived
> from, and a photo of the running desktop are at:
> 
>   https://github.com/BarzinL/h616-hdmi-mainline
> 
> Based on mainline a500db7819c5.

NACK.

This uses old, improper description of HW. That's why it was never
merged. Two mixers would never work with it. Also, TCON_TOP
isn't directly compatible with H6.

Here is newer work:
https://lore.kernel.org/linux-sunxi/20260509190015.79086-1-jernej.skrabec@siol.net/

Best regards,
Jernej

> 
> Barzin Lotfabadi (2):
>   arm64: dts: allwinner: h616: add display engine and HDMI nodes
>   arm64: dts: allwinner: orangepi-zero3: enable HDMI output
> 
>  arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi     | 191 +++++++++++++++++++++
>  .../dts/allwinner/sun50i-h618-orangepi-zero3.dts   |  25 +++
>  2 files changed, 216 insertions(+)
> 
>