[v4,0/2] Add HDMI audio on the Radxa ROCK 5B

Message

Detlev Casanova Jan. 31, 2025, 3:23 p.m. UTC

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 ROCK 5B device tree.

Based on Linus' master branch.

[1]: https://lore.kernel.org/all/[e-mail]/

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 (1):
  arm64: dts: rockchip: Add HDMI0 audio output on rock-5b

Sugar Zhang (1):
  drm/bridge: synopsys: Add audio support for dw-hdmi-qp

 arch/arm64/boot/dts/rockchip/rk3588-base.dtsi |   1 +
 .../boot/dts/rockchip/rk3588-rock-5b.dts      |  19 +
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c  | 497 ++++++++++++++++++
 3 files changed, 517 insertions(+)