[alsa-devel] [PATCH] ALSA: hda - using POS_FIX_LPIB on Broadwell HDMI Audio

[Yang, Libin]

Hi Takashi,

I checked the wallclock counter. The counter is OK. But it failed to correct the position.

This issue happens when we play sound on HDMI audio. We have tried with aplay and paplay. 

I have tried the buffer size of 16384, 8192 and 4096 and with the sample rate of 48KHz and 44.1KHz.

Regards,
Libin

> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai at suse.de]
> Sent: Thursday, May 8, 2014 1:09 PM
> To: Yang, Libin
> Cc: alsa-devel at alsa-project.org; Lin, Mengdong; Pierre-Louis Bossart
> Subject: Re: [PATCH] ALSA: hda - using POS_FIX_LPIB on Broadwell HDMI
> Audio
> 
> At Thu,  8 May 2014 02:03:24 +0800,
> libin.yang at intel.com wrote:
> >
> > From: Libin Yang <libin.yang at intel.com>
> >
> > Audio stream is not continuous if using position buffer on Broadwell
> > HDMI audio. Sound is clipped.
> > Fix this issue by using POS_FIX_LPIB.
> 
> That's odd.  The recent Intel hardware has a wallclock support, so the
> position should be corrected by that.
> 
> In which situation did the problem happen?  Did it happen with every
> application and any period/buffer setup?
> 
> 
> Takashi
> 
> >
> > Signed-off-by: Libin Yang <libin.yang at intel.com>
> > ---
> >  sound/pci/hda/hda_intel.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> > index b540ad7..9cd40c6 100644
> > --- a/sound/pci/hda/hda_intel.c
> > +++ b/sound/pci/hda/hda_intel.c
> > @@ -993,6 +993,7 @@ static struct snd_pci_quirk position_fix_list[] = {
> >  	SND_PCI_QUIRK(0x1565, 0x8218, "Biostar Microtech", POS_FIX_LPIB),
> >  	SND_PCI_QUIRK(0x1849, 0x0888, "775Dual-VSTA", POS_FIX_LPIB),
> >  	SND_PCI_QUIRK(0x8086, 0x2503, "DG965OT AAD63733-203",
> POS_FIX_LPIB),
> > +	SND_PCI_QUIRK(0x8086, 0x2010, "Broadwell HDMI audio",
> POS_FIX_LPIB),
> >  	{}
> >  };
> >
> > --
> > 1.8.3.2
> >