[alsa-devel] [PATCH V2 5/7] ALSA: x86: hdmi: Improve position reporting

[Anand, Jerome]

> -----Original Message-----
> From: Pierre-Louis Bossart [mailto:pierre-louis.bossart at linux.intel.com]
> Sent: Saturday, January 7, 2017 2:10 AM
> To: Anand, Jerome <jerome.anand at intel.com>; intel-
> gfx at lists.freedesktop.org; alsa-devel at alsa-project.org
> Cc: tiwai at suse.de; broonie at kernel.org; Ughreja, Rakesh A
> <rakesh.a.ughreja at intel.com>; ville.syrjala at linux.intel.com
> Subject: Re: [alsa-devel] [PATCH V2 5/7] ALSA: x86: hdmi: Improve position
> reporting
> 
> On 1/6/17 7:21 PM, Jerome Anand wrote:
> > Use a hw register to calculate sub-period position reports.
> > This makes PulseAudio happier.
> 
>  From Takashi: There is no big merit to keep this a separate patch.
> Please fold into the main patch. You can put some comment in the code for
> explanation.
> 

Misread the final comments. Thought we will be having it as separate patches only
Do you still think we can merge these changes to the main file ?

> 
> 
> >
> > Signed-off-by: David Henningsson <david.henningsson at canonical.com>
> > Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> > Signed-off-by: Jerome Anand <jerome.anand at intel.com>
> > ---
> >  sound/x86/intel_hdmi_audio.c | 12 +++++++++++-
> >  1 file changed, 11 insertions(+), 1 deletion(-)
> >
> > diff --git a/sound/x86/intel_hdmi_audio.c
> b/sound/x86/intel_hdmi_audio.c
> > index d7b57658..d2036bc 100644
> > --- a/sound/x86/intel_hdmi_audio.c
> > +++ b/sound/x86/intel_hdmi_audio.c
> > @@ -1489,6 +1489,8 @@ static snd_pcm_uframes_t
> snd_intelhad_pcm_pointer(
> >  {
> >  	struct snd_intelhad *intelhaddata;
> >  	u32 bytes_rendered = 0;
> > +	u32 t;
> > +	int buf_id;
> >
> >  	/* pr_debug("snd_intelhad_pcm_pointer called\n"); */
> >
> > @@ -1499,6 +1501,14 @@ static snd_pcm_uframes_t
> snd_intelhad_pcm_pointer(
> >  		return SNDRV_PCM_POS_XRUN;
> >  	}
> >
> > +	buf_id = intelhaddata->curr_buf % 4;
> > +	had_read_register(AUD_BUF_A_LENGTH + (buf_id *
> HAD_REG_WIDTH), &t);
> > +	if (t == 0) {
> > +		pr_debug("discovered buffer done for buf %d\n", buf_id);
> > +		/* had_process_buffer_done(intelhaddata); */
> > +	}
> > +	t = intelhaddata->buf_info[buf_id].buf_size - t;
> > +
> >  	if (intelhaddata->stream_info.buffer_rendered)
> >  		div_u64_rem(intelhaddata->stream_info.buffer_rendered,
> >  			intelhaddata->stream_info.ring_buf_size,
> > @@ -1506,7 +1516,7 @@ static snd_pcm_uframes_t
> snd_intelhad_pcm_pointer(
> >
> >  	intelhaddata->stream_info.buffer_ptr = bytes_to_frames(
> >  						substream->runtime,
> > -						bytes_rendered);
> > +						bytes_rendered + t);
> >  	return intelhaddata->stream_info.buffer_ptr;
> >  }
> >
> >