[alsa-devel] [PATCH RFC 1/3] drm/i915: Avoid MST pipe handling for LPE audio

[Takashi Iwai]

On Fri, 27 Jan 2017 15:15:14 +0100,
Pierre-Louis Bossart wrote:
> 
> 
> 
> On 01/27/2017 04:36 AM, Takashi Iwai wrote:
> > The pipe gets cleared to -1 for non-MST before the ELD audio
> > notification due to the MST audio support.  This makes sense for
> > HD-audio that received the MST handling, but it's useless for LPE
> > audio.  Handle the MST pipe hack conditionally only for HD-audio.
> >
> > Reported-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> > Signed-off-by: Takashi Iwai <tiwai at suse.de>
> > ---
> >   drivers/gpu/drm/i915/intel_audio.c | 21 +++++++++++----------
> >   1 file changed, 11 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> > index 1645ce42b898..d4e6d1136cfe 100644
> > --- a/drivers/gpu/drm/i915/intel_audio.c
> > +++ b/drivers/gpu/drm/i915/intel_audio.c
> > @@ -624,13 +624,14 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder,
> >   	dev_priv->av_enc_map[pipe] = intel_encoder;
> >   	mutex_unlock(&dev_priv->av_mutex);
> >   -	/* audio drivers expect pipe = -1 to indicate Non-MST cases */
> > -	if (intel_encoder->type != INTEL_OUTPUT_DP_MST)
> > -		pipe = -1;
> > -
> > -	if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify)
> > +	if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify) {
> > +		/* audio drivers expect pipe = -1 to indicate Non-MST cases */
> > +		if (intel_encoder->type != INTEL_OUTPUT_DP_MST)
> > +			pipe = -1;
> >   		acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr,
> >   						 (int) port, (int) pipe);
> > +	}
> > +
> Cool. I missed this part, couldn't figure out where the -1 was coming from.
> So do you get audio working on both of the DP ports now?

DP1 is working now.
DP3 starts streaming, but no audio came out yet :-<


Takashi