<pre>
Hi Tzung-Bi,

We would want to confirm with you as we work on the hdmi-codec for the
mt8186.

Do you have any plan to continue working on this series? We may take
over as well.

Thanks,
Allen

On Tue, 2019-10-22 at 19:45 +0800, Tzung-Bi Shih wrote:
> HDMI codec may be also interested in PCM triggers. Add PCM trigger
> operator.
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
> ---
> include/sound/hdmi-codec.h | 13 +++++++++++++
> sound/soc/codecs/hdmi-codec.c | 31 +++++++++++++++++++++++++++++++
> 2 files changed, 44 insertions(+)
>
> diff --git a/include/sound/hdmi-codec.h b/include/sound/hdmi-codec.h
> index 83b17682e01c..9de462ef170d 100644
> --- a/include/sound/hdmi-codec.h
> +++ b/include/sound/hdmi-codec.h
> @@ -50,6 +50,13 @@ struct hdmi_codec_params {
> typedef void (*hdmi_codec_plugged_cb)(struct device *dev,
> bool plugged);
>
> +enum {
> +HDMI_CODEC_TRIGGER_EVENT_STOP,
> +HDMI_CODEC_TRIGGER_EVENT_START,
> +HDMI_CODEC_TRIGGER_EVENT_SUSPEND,
> +HDMI_CODEC_TRIGGER_EVENT_RESUME,
> +};
> +
> struct hdmi_codec_pdata;
> struct hdmi_codec_ops {
> /*
> @@ -66,6 +73,12 @@ struct hdmi_codec_ops {
> struct hdmi_codec_daifmt *fmt,
> struct hdmi_codec_params *hparms);
>
> +/*
> + * PCM trigger callback.
> + * Optional
> + */
> +int (*trigger)(struct device *dev, int event);
> +
> /*
> * Shuts down the audio stream.
> * Mandatory
> diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-
> codec.c
> index b5fd8f08726e..1ba2fa26ba03 100644
> --- a/sound/soc/codecs/hdmi-codec.c
> +++ b/sound/soc/codecs/hdmi-codec.c
> @@ -565,12 +565,42 @@ static int hdmi_codec_digital_mute(struct
> snd_soc_dai *dai, int mute)
> return 0;
> }
>
> +static int hdmi_codec_trigger(struct snd_pcm_substream *substream,
> int cmd,
> + struct snd_soc_dai *dai)
> +{
> +struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
> +int event;
> +
> +if (!hcp->hcd.ops->trigger)
> +return 0;
> +
> +switch (cmd) {
> +case SNDRV_PCM_TRIGGER_STOP:
> +event = HDMI_CODEC_TRIGGER_EVENT_STOP;
> +break;
> +case SNDRV_PCM_TRIGGER_START:
> +event = HDMI_CODEC_TRIGGER_EVENT_START;
> +break;
> +case SNDRV_PCM_TRIGGER_SUSPEND:
> +event = HDMI_CODEC_TRIGGER_EVENT_SUSPEND;
> +break;
> +case SNDRV_PCM_TRIGGER_RESUME:
> +event = HDMI_CODEC_TRIGGER_EVENT_RESUME;
> +break;
> +default:
> +return -EINVAL;
> +}
> +
> +return hcp->hcd.ops->trigger(dai->dev->parent, event);
> +}
> +
> static const struct snd_soc_dai_ops hdmi_codec_i2s_dai_ops = {
> .startup= hdmi_codec_startup,
> .shutdown= hdmi_codec_shutdown,
> .hw_params= hdmi_codec_hw_params,
> .set_fmt= hdmi_codec_i2s_set_fmt,
> .digital_mute= hdmi_codec_digital_mute,
> +.trigger= hdmi_codec_trigger,
> };
>
> static const struct snd_soc_dai_ops hdmi_codec_spdif_dai_ops = {
> @@ -578,6 +608,7 @@ static const struct snd_soc_dai_ops
> hdmi_codec_spdif_dai_ops = {
> .shutdown= hdmi_codec_shutdown,
> .hw_params= hdmi_codec_hw_params,
> .digital_mute= hdmi_codec_digital_mute,
> +.trigger= hdmi_codec_trigger,
> };
>
> #define HDMI_RATES(SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\

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