linux-kernel - Re: [PATCH] ASoC: core: restore dpcm flags semantics

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Date:   Thu, 30 Jul 2020 19:12:57 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        Kevin Hilman <khilman@...libre.com>, zhangn1985@...look.com,
        Stephan Gerhold <stephan@...hold.net>
Subject: Re: [PATCH] ASoC: core: restore dpcm flags semantics

On Thu, Jul 30, 2020 at 11:04:53AM +0200, Jerome Brunet wrote:

> Carrying redundant information makes things complex and error prone.
> If you really want to update this, here is another proposition:
>  * Removing snd_soc_dai_link_set_capabilities()
>  * Removing both flags completely
>  * Let ASoC figure out what is needed based on the components present.

My understanding is that that was broadly where we were headed with this
stuff - snd_soc_dai_link_set_capabilities() is trying to figure things
out from the components already, it's storing the flags as a cache but
could be modified so we use it every time we need a value.

> 
> >
> >>
> >> Cc: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> >> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
> >> ---
> >>
> >>   Hi Mark,
> >>
> >>   Because b73287f0b0745 ('ASoC: soc-pcm: dpcm: fix playback/capture checks')
> >>   introduced more than one problem, the change
> >>   "ASoC: core: use less strict tests for dailink capabilities" [0] is still
> >>   necessary but the change of semantic remains a problem with it.
> >>
> >>   This patch applies on top of it.
> >>
> >>   sound/soc/soc-pcm.c | 14 --------------
> >>   1 file changed, 14 deletions(-)
> >>
> >> diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
> >> index 00ac1cbf6f88..2e205b738eae 100644
> >> --- a/sound/soc/soc-pcm.c
> >> +++ b/sound/soc/soc-pcm.c
> >> @@ -2749,13 +2749,6 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
> >>   					break;
> >>   				}
> >>   			}
> >> -
> >> -			if (!playback) {
> >> -				dev_err(rtd->card->dev,
> >> -					"No CPU DAIs support playback for stream %s\n",
> >> -					rtd->dai_link->stream_name);
> >> -				return -EINVAL;
> >> -			}
> >>   		}
> >>   		if (rtd->dai_link->dpcm_capture) {
> >>   			stream = SNDRV_PCM_STREAM_CAPTURE;
> >> @@ -2766,13 +2759,6 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
> >>   					break;
> >>   				}
> >>   			}
> >> -
> >> -			if (!capture) {
> >> -				dev_err(rtd->card->dev,
> >> -					"No CPU DAIs support capture for stream %s\n",
> >> -					rtd->dai_link->stream_name);
> >> -				return -EINVAL;
> >> -			}
> >>   		}
> >>   	} else {
> >>   		/* Adapt stream for codec2codec links */
> >>
> 

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