linux-kernel - Re: [alsa-devel] [PATCH] ASoC: soc-core: Set dpcm_playback / dpcm

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Date:   Thu, 5 Dec 2019 11:18:01 +0200
From:   Daniel Baluta <daniel.baluta@...il.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     "Sridharan, Ranjani" <ranjani.sridharan@...el.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Pierre-louis Bossart <pierre-louis.bossart@...el.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH] ASoC: soc-core: Set dpcm_playback / dpcm_capture

On Thu, Dec 5, 2019 at 6:11 AM Pierre-Louis Bossart
<pierre-louis.bossart@...ux.intel.com> wrote:
>
>
>
> On 12/4/19 5:29 PM, Sridharan, Ranjani wrote:
> > On Wed, Dec 4, 2019 at 7:16 AM Daniel Baluta <daniel.baluta@....com> wrote:
> >
> >> When converting a normal link to a DPCM link we need
> >> to set dpcm_playback / dpcm_capture otherwise playback/capture
> >> streams will not be created resulting in errors like this:
> >>
> >> [   36.039111]  sai1-wm8960-hifi: ASoC: no backend playback stream
> >>
> >> Fixes: a655de808cbde ("ASoC: core: Allow topology to override machine
> >> driver FE DAI link config")
> >> Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> >> ---
> >>   sound/soc/soc-core.c | 2 ++
> >>   1 file changed, 2 insertions(+)
> >>
> >> diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
> >> index 977a7bfad519..f89cf9d0860c 100644
> >> --- a/sound/soc/soc-core.c
> >> +++ b/sound/soc/soc-core.c
> >> @@ -1872,6 +1872,8 @@ static void soc_check_tplg_fes(struct snd_soc_card
> >> *card)
> >>
> >>                          /* convert non BE into BE */
> >>                          dai_link->no_pcm = 1;
> >> +                       dai_link->dpcm_playback = 1;
> >> +                       dai_link->dpcm_capture = 1;
> >>
> > Hi Daniel,
> >
> > Typically, for Intel platforms, this information comes from the machine
> > driver and there are some DAI links that have either playback or capture
> > set. But this change would set both for all DAI links.
> > Not sure if this is the right thing to do.
>
> I am with Ranjani, I don't get why we'd set the full-duplex mode by
> default. but to be honest I never quite understood what this code is
> supposed to do...

Indeed I need to figure out when exactly to enable playback/capture. I
was hoping
Liam will chime in, as this was in the original patch he sent months ago.