[v3,0/2] ASoC: prepare streams on codec-to-codec links

Message

Martin Blumenstingl Jan. 14, 2025, 9:56 p.m. UTC

Hello,

the DRM subsystem has recently gained a HDMI audio codec framework [0].
This is already queued for Linux 6.14.

I want to implement a HDMI controller driver for the Amlogic
Meson8/8b/8m2 SoCs using the DRM HDMI audio codec framework. Internally
the DRM HDMI audio codec framework relies on hdmi-codec's .prepare
callback to be called. This unfortunately is not happening on Amlogic
Meson8/8b/8m2 platforms [1].

Jerome suggested that this may be because of the codec-to-codec link on
our Amlogic AIU audio driver [2]. He encouraged me to send this series
to allow hdmi-codec's .prepare() callback to be called - even on
platforms that connect it via a codec-to-codec link.

The reason why this series is marked as RFC is that I'm not familiar
with the ASoC subsystem and lot of the functionality and terminology
is new to me.

Also I Cc'ed Sylwester Nawrocki (Samsung maintainer) as codec-to-codec
links seem to be most heavily used on Samsung and Amlogic platforms.

Changes since v2 at [4]:
- add Reviewed-by from Charles and Jerome (thank you!)
- dropped RFC status

Changes since v1 at [3]:
- updated patch #2 to also prepare the source side of the link for
  consistency reasons (as suggested by Jerome and Mark)


[0] https://lore.kernel.org/dri-devel/[e-mail]/
[1] https://lore.kernel.org/linux-amlogic/CAFBinCDdiJ3UNVUcShjq=7U2=[e-mail]/
[2] https://lore.kernel.org/linux-amlogic/[e-mail]/
[3] https://lore.kernel.org/linux-sound/[e-mail]/
[4] https://lore.kernel.org/linux-sound/[e-mail]/


Martin Blumenstingl (2):
  ASoC: soc-dai: add snd_soc_dai_prepare() and use it internally
  ASoC: dapm: add support for preparing streams

 include/sound/soc-dai.h |  3 +++
 sound/soc/soc-dai.c     | 27 +++++++++++++++++++--------
 sound/soc/soc-dapm.c    | 12 ++++++++++++
 3 files changed, 34 insertions(+), 8 deletions(-)

Comments

Mark Brown Jan. 15, 2025, 7:38 p.m. UTC | #1

On Tue, 14 Jan 2025 22:56:15 +0100, Martin Blumenstingl wrote:
> the DRM subsystem has recently gained a HDMI audio codec framework [0].
> This is already queued for Linux 6.14.
> 
> I want to implement a HDMI controller driver for the Amlogic
> Meson8/8b/8m2 SoCs using the DRM HDMI audio codec framework. Internally
> the DRM HDMI audio codec framework relies on hdmi-codec's .prepare
> callback to be called. This unfortunately is not happening on Amlogic
> Meson8/8b/8m2 platforms [1].
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/2] ASoC: soc-dai: add snd_soc_dai_prepare() and use it internally
      commit: d4e91adfc261de1454538ee6437e6014a2d1fca1
[2/2] ASoC: dapm: add support for preparing streams
      commit: e436d43551764bd6ca22a1ab1e80e98939b8aec7

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark