[alsa-devel] [PATCH v3 3/4] ALSA: hda - display audio call sync_audio_rate callback

[Takashi Iwai]

On Mon, 17 Aug 2015 12:40:00 +0200,
libin.yang at intel.com wrote:
> 
> From: Libin Yang <libin.yang at intel.com>
> 
> For display audio, call the sync_audio_rate callback function
> to do the synchronization between gfx driver and audio driver.
> 
> Signed-off-by: Libin Yang <libin.yang at intel.com>

I guess it would be easier to take this series from drm tree.
Feel free to my ack
  Reviewed-by: Takashi Iwai <tiwai at suse.de>


thanks,

Takashi


> ---
>  sound/pci/hda/patch_hdmi.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
> index a97db5f..1668868 100644
> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -1770,6 +1770,16 @@ static bool check_non_pcm_per_cvt(struct hda_codec *codec, hda_nid_t cvt_nid)
>  	return non_pcm;
>  }
>  
> +/* There is a fixed mapping between audio pin node and display port
> + * on current Intel platforms:
> + * Pin Widget 5 - PORT B (port = 1 in i915 driver)
> + * Pin Widget 6 - PORT C (port = 2 in i915 driver)
> + * Pin Widget 7 - PORT D (port = 3 in i915 driver)
> + */
> +static int intel_pin2port(hda_nid_t pin_nid)
> +{
> +	return pin_nid - 4;
> +}
>  
>  /*
>   * HDMI callbacks
> @@ -1786,6 +1796,8 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
>  	int pin_idx = hinfo_to_pin_index(codec, hinfo);
>  	struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
>  	hda_nid_t pin_nid = per_pin->pin_nid;
> +	struct snd_pcm_runtime *runtime = substream->runtime;
> +	struct i915_audio_component *acomp = codec->bus->core.audio_component;
>  	bool non_pcm;
>  	int pinctl;
>  
> @@ -1802,6 +1814,13 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
>  		intel_not_share_assigned_cvt(codec, pin_nid, per_pin->mux_idx);
>  	}
>  
> +	/* Call sync_audio_rate to set the N/CTS/M manually if necessary */
> +	/* Todo: add DP1.2 MST audio support later */
> +	if (acomp && acomp->ops && acomp->ops->sync_audio_rate)
> +		acomp->ops->sync_audio_rate(acomp->dev,
> +				intel_pin2port(pin_nid),
> +				runtime->rate);
> +
>  	non_pcm = check_non_pcm_per_cvt(codec, cvt_nid);
>  	mutex_lock(&per_pin->lock);
>  	per_pin->channels = substream->runtime->channels;
> -- 
> 1.9.1
>