diff options
author | Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | 2024-08-21 02:13:56 +0000 |
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committer | Mark Brown <broonie@kernel.org> | 2024-08-22 13:36:45 +0100 |
commit | fd69dfe6789f4ed46d1fdb52e223cff83946d997 (patch) | |
tree | 170c946832d32ac6e0d8045b8e05b56caffe6a7c /include | |
parent | 61c80c77b4f35e229347551d13e265752f067151 (diff) |
ASoC: soc-pcm: Indicate warning if dpcm_playback/capture were used for availability limition
I have been wondering why DPCM needs special flag (= dpcm_playback/capture)
to use it. Below is the history why it was added to ASoC.
(A) In beginning, there was no dpcm_xxx flag on ASoC.
It checks channels_min for DPCM, same as current non-DPCM.
Let's name it as "validation check" here.
if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
if (cpu_dai->driver->playback.channels_min)
playback = 1;
if (cpu_dai->driver->capture.channels_min)
capture = 1;
(B) commit 1e9de42f4324 ("ASoC: dpcm: Explicitly set BE DAI link supported
stream directions") force to use dpcm_xxx flag on DPCM. According to
this commit log, this is because "Some BE dummy DAI doesn't set
channels_min for playback/capture". But we don't know which DAI is it,
and not know why it can't/don't have channels_min. Let's name it as
"no_chan_DAI" here. According to the code and git-log, it is used as
DCPM-BE and is CPU DAI. I think the correct solution was set
channels_min on "no_chan_DAI" side, not update ASoC framework side. But
everything is under smoke today.
if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
playback = rtd->dai_link->dpcm_playback;
capture = rtd->dai_link->dpcm_capture;
(C) commit 9b5db059366a ("ASoC: soc-pcm: dpcm: Only allow playback/capture
if supported") checks channels_min (= validation check) again. Because
DPCM availability was handled by dpcm_xxx flag at that time, but some
Sound Card set it even though it wasn't available. Clearly there's
a contradiction here. I think correct solution was update Sound Card
side instead of ASoC framework. Sound Card side will be updated to
handle this issue later (commit 25612477d20b ("ASoC: soc-dai: set
dai_link dpcm_ flags with a helper"))
if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
...
playback = rtd->dai_link->dpcm_playback &&
snd_soc_dai_stream_valid(cpu_dai, ...);
capture = rtd->dai_link->dpcm_capture &&
snd_soc_dai_stream_valid(cpu_dai, ...);
This (C) patch should have broken "no_chan_DAI" which doesn't have
channels_min, but there was no such report during this 4 years.
Possibilities case are as follows
- No one is using "no_chan_DAI"
- "no_chan_DAI" is no longer exist : was removed ?
- "no_chan_DAI" is no longer exist : has channels_min ?
Because of these history, this dpcm_xxx is unneeded flag today. But because
we have been used it for 10 years since (B), it may have been used
differently. For example some DAI available both playback/capture, but it
set dpcm_playback flag only, in this case dpcm_xxx flag is used as
availability limitation. We can use playback_only flag instead in this
case, but it is very difficult to find such DAI today.
Let's add grace time to remove dpcm_playback/capture flag.
This patch don't use dpcm_xxx flag anymore, and indicates warning to use
xxx_only flag if both playback/capture were available but using only
one of dpcm_xxx flag, and not using xxx_only flag.
Link: https://lore.kernel.org/r/87edaym2cg.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://patch.msgid.link/87seuyaahn.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/sound/soc.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sound/soc.h b/include/sound/soc.h index e844f6afc5b5..81ef380b2e06 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -815,6 +815,7 @@ struct snd_soc_dai_link { /* This DAI link can route to other DAI links at runtime (Frontend)*/ unsigned int dynamic:1; + /* REMOVE ME */ /* DPCM capture and Playback support */ unsigned int dpcm_capture:1; unsigned int dpcm_playback:1; |