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@xxxxxxxxxxxx>
