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

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Date:   Wed, 4 Dec 2019 22:01:18 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     "Sridharan, Ranjani" <ranjani.sridharan@...el.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Pierre-louis Bossart <pierre-louis.bossart@...el.com>
Cc:     Linux-ALSA <alsa-devel@...a-project.org>,
        Mark Brown <broonie@...nel.org>, tiwai@...e.com,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH] ASoC: soc-core: Set dpcm_playback /
 dpcm_capture



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...