Re: [PATCH v7 0/3] Add HDMI audio on the rk3588 SoC

[Piotr Oniszczuk <piotr.oniszczuk@gmail.com>]

> Wiadomość napisana przez Detlev Casanova <detlev.casanova@collabora.com> w dniu 17 lut 2025, o godz. 22:47:
> 
> To support HDMI audio on the rk3588 based devices, the generic HDMI
> Codec framework is used in the dw-hdmi-qp DRM bridge driver.
> 
> The implementation is mainly based on the downstream driver, ported to the
> generic HDMI Codec framework [1] recently merged in the master branch.
> The parameters computation has been kept as is and the data stored in the
> dw_hdmi_qp struct as been cleaned up.
> 
> The table for the N values has been edited to reflect N recommended values
> as well as CTS recommended values.
> 
> The downstream kernel also implements a machine driver for HDMI audio but
> it is doing exactly what the simple-audio-card driver does, so use that
> instead in the RK3588 SoC device tree.
> 
> This adds HDMI audio support for both HDMI TX ports.
> 
> *** Dependencies ***
> 
> Based on Linus' master branch, but also needs Cristian's dts patches for HDMI1
> support [2], which depends on Heiko's patchset for
> phy-rockchip-samsung-hdptx [3]. Patches will apply without [3], but HDMI will
> not work (at all).
> 
> [1]: https://lore.kernel.org/all/20241224-drm-bridge-hdmi-connector-v10-0-dc89577cd438@linaro.org
> [2]: https://lore.kernel.org/linux-rockchip/20241211-rk3588-hdmi1-v2-0-02cdca22ff68@collabora.com
> [3]: https://lore.kernel.org/lkml/20241206103401.1780416-3-heiko@sntech.de/
> 
> Changes since v6:
> - Fix arguments alignement (checkpatch --strict warnings)
> - Add hdmi1 audio support too
> - Move hdmi0_sound node under hdmi0_out_con
> 
> Changes since v5:
> - Simplify audio math computation for N
> - Move hdmi0-sound node up with other address-less nodes
> 
> Changes since v4:
> - Moved hdmi0_audio node the rk3588-base.dtsi
> - Enable hdmi0_audio in rk3588-rock-5b.dts
> 
> Changes since v3:
> - Renamed function to start with dw_hdmi_qp
> 
> Changes since v2:
> - Also clear the audio infoframe
> - Write AUDI_CONTENTS0 to its default value in case it gets overwritten.
> - Store tmds_char_rate in the dw_hdmi_qp struct in atomic_enable
> - Clear tmds_char_rate in atomic_disable and only write registers when
>   tmds_char_rate is not 0.
> - Do not use connector_state duplicates
> 
> Changes since v1:
> - Remove useless audio_mutex (was used downstream for multiple drivers access
>   to audio functions)
> - Let hdmi_codec build and setup audio infoframes
> - Only access audio registers when connector is connected
> - Rebased on master branch
> 
> Detlev Casanova (2):
>  arm64: dts: rockchip: Add HDMI audio outputs for rk3588 SoC
>  arm64: dts: rockchip: Enable HDMI audio outputs for Rock 5B
> 
> Sugar Zhang (1):
>  drm/bridge: synopsys: Add audio support for dw-hdmi-qp
> 
> arch/arm64/boot/dts/rockchip/rk3588-base.dtsi |  17 +
> .../arm64/boot/dts/rockchip/rk3588-extra.dtsi |  17 +
> .../boot/dts/rockchip/rk3588-rock-5b.dts      |  16 +
> drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c  | 489 ++++++++++++++++++
> 4 files changed, 539 insertions(+)
> 
> -- 
> 2.48.1
> 
> 
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Detelv,

Just curious of your opinion:

I’m on 6.14-rc3 and using https://gitlab.collabora.com/cristicc/linux-next/-/commits/rk3588-hdmi-bridge + this v7 series.

On mine rock5b all works nicely but - at boot time - i’m getting some oops in kernel like this: https://gist.github.com/warpme/e1668acbef7817e5d2a88a6840328722

I’m not sure where issue is but it looks to me like kind of interference between analog audio and hdmi audio as commenting analog audio in dts ( https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts?h=v6.14-rc3#n24 ) stops kernel from oops’ing….

 rock5b dts i’m using is like this: https://gist.github.com/warpme/a8a32afd4a05d4b7f25d2808984b05ac