linux-kernel - Re: [PATCH 0/5] ASoC: meson: add hdmitx glue support

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Message-ID: <f7bafd16-1332-e124-79fb-7f045975aed9@baylibre.com>
Date:   Wed, 15 May 2019 15:32:55 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Jerome Brunet <jbrunet@...libre.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Kevin Hilman <khilman@...libre.com>
Cc:     devicetree@...r.kernel.org, alsa-devel@...a-project.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] ASoC: meson: add hdmitx glue support

On 15/05/2019 15:18, Jerome Brunet wrote:
> On the Amlogic SoC, there is a glue between the SoC audio outputs and the
> input of the embedded Synopsys HDMI controller.
> 
> On the g12a, this glue is mostly a couple of muxes to select the i2s and
> spdif inputs of the hdmi controller. Each of these inputs may have
> different hw_params and fmt which makes our life a little bit more
> interesting, especially when switching between to active inputs.
> 
> This glue is modeled as codec driver and uses codec-to-codec links to
> connect to the Synopsys controller. This allows to use the regular
> hdmi-codec driver (used by dw-hdmi i2s).
> 
> To avoid glitches while switching input, the trick is to temporarily
> force a disconnection of the mux output, which shutdowns the output dai
> link. This also ensure that the stream parameters and fmt are updated
> when the output is connected back.
> 
> Jerome Brunet (5):
>   ASoC: meson: axg-card: set link name based on link node name
>   ASoC: dapm: allow muxes to force a disconnect
>   ASoC: meson: add tohdmitx DT bindings
>   ASoC: meson: axg-card: add basic codec-to-codec link support
>   ASoC: meson: add g12a tohdmitx control
> 
>  .../bindings/sound/amlogic,g12a-tohdmitx.txt  |  55 +++
>  .../dt-bindings/sound/meson-g12a-tohdmitx.h   |  13 +
>  sound/soc/meson/Kconfig                       |   8 +
>  sound/soc/meson/Makefile                      |   2 +
>  sound/soc/meson/axg-card.c                    |  31 +-
>  sound/soc/meson/g12a-tohdmitx.c               | 413 ++++++++++++++++++
>  sound/soc/soc-dapm.c                          |   2 +-
>  7 files changed, 518 insertions(+), 6 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/sound/amlogic,g12a-tohdmitx.txt
>  create mode 100644 include/dt-bindings/sound/meson-g12a-tohdmitx.h
>  create mode 100644 sound/soc/meson/g12a-tohdmitx.c
> 

Tested-by: Neil Armstrong <narmstrong@...libre.com>