Re: [PATCH 01/13] ASoC: soc-pcm: Don't reconnect an already active BE

Pierre-Louis Bossart
2021-09-30T19:02:36Z

> 1. The original issue at my end was not just a configuration redundancy.
> I realize now that with more stream addition following error print is seen.
>    "ASoC: too many users playback at open 4"
>
>    This is because the max DPCM users is capped at 8. Increasing this
> may help (need to see what number is better), but does not address the
> redundancy problem.
Going back to this DPCM_MAX_BE_USERS definition, it seems rather
arbitrary and not so useful indeed.

/* first time the dpcm is open ? */
if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
dev_err(be->dev, "ASoC: too many users %s at open %d\n",
stream ? "capture" : "playback",
be->dpcm[stream].state);
continue;
}

The comment is no longer aligned with the code, wondering if this is a
feature or a bug. There's no reason to arbitrarily restrict the number
of users of a BE, or the check would need to use platform-specific
information such as the number of inputs/outputs supported by a mixer/demux.

Maybe Morimoto-san can comment since this was added in:

1db19c151819 ('ASoC: soc-pcm: fixup dpcm_be_dai_startup() user count')

We're not done with soc-pcm.c cleanups :-)