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 -- 2.20.1
