From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>, broonie@kernel.org
Cc: robh@kernel.org, alsa-devel@alsa-project.org,
bgoswami@codeaurora.org, spapothi@codeaurora.org,
lgirdwood@gmail.com, vkoul@kernel.org
Subject: Re: [alsa-devel] [PATCH v10 2/2] ASoC: codecs: add wsa881x amplifier support
Date: Fri, 20 Dec 2019 09:45:01 -0600 [thread overview]
Message-ID: <052d527b-77a5-172e-2b18-ca635242b440@linux.intel.com> (raw)
In-Reply-To: <20191220115629.8293-3-srinivas.kandagatla@linaro.org>
Looks mostly good, couple of comments below.
> +static int wsa881x_prepare(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct wsa881x_priv *wsa881x = dev_get_drvdata(dai->dev);
> + int ret;
> +
> + if (wsa881x->stream_prepared) {
> + sdw_disable_stream(wsa881x->sruntime);
> + sdw_deprepare_stream(wsa881x->sruntime);
> + wsa881x->stream_prepared = false;
> + }
in what scenario would you have a transition from a stream active to
prepared?
> +
> +
> + ret = sdw_prepare_stream(wsa881x->sruntime);
> + if (ret)
> + return ret;
> +
> + /**
> + * NOTE: there is a strict hw requirement about the ordering of port
> + * enables and actual PA enable. PA enable should only happen after
PA == power amplifiers?
> + * soundwire ports are enabled if not DC on the line is accumlated
accumulated
> + * resulting in Click/Pop Noise
> + */
> +
> + ret = sdw_enable_stream(wsa881x->sruntime);
I guess this answers to my question above, you are not using the 'usual'
mapping between ALSA states and SoundWire stream states. Enabling the
stream will cause a bank switch and (zero?) data to be transmitted, is
this intentional?
If this is due to the order with the PA, then where is the PA handled?
> + if (ret) {
> + sdw_deprepare_stream(wsa881x->sruntime);
> + return ret;
> + }
> + wsa881x->stream_prepared = true;
> +
> + return ret;
> +}
> +
> +static int wsa881x_hw_params(struct snd_pcm_substream *substream,
> + struct snd_pcm_hw_params *params,
> + struct snd_soc_dai *dai)
> +{
> + struct wsa881x_priv *wsa881x = dev_get_drvdata(dai->dev);
> + int i;
> +
> + wsa881x->active_ports = 0;
> + for (i = 0; i < WSA881X_MAX_SWR_PORTS; i++) {
> + if (!wsa881x->port_enable[i])
> + continue;
> +
> + wsa881x->port_config[wsa881x->active_ports] =
> + wsa881x_pconfig[i];
> + wsa881x->active_ports++;
> + }
> +
> + return sdw_stream_add_slave(wsa881x->slave, &wsa881x->sconfig,
> + wsa881x->port_config, wsa881x->active_ports,
> + wsa881x->sruntime);
> +}
> +
> +static int wsa881x_hw_free(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct wsa881x_priv *wsa881x = dev_get_drvdata(dai->dev);
> +
> + sdw_disable_stream(wsa881x->sruntime);
> + sdw_deprepare_stream(wsa881x->sruntime);
This works if you do a hw_params->prepare->hw_free transition, but isn't
it possible to have hw_params->hw_free as well? In that case the stream
would not enabled/prepared, so shouldn't you have the same test as in
prepare?
if (wsa881x->stream_prepared) {
sdw_disable_stream(wsa881x->sruntime);
sdw_deprepare_stream(wsa881x->sruntime);
wsa881x->stream_prepared = false;
}
> + sdw_stream_remove_slave(wsa881x->slave, wsa881x->sruntime);
> + wsa881x->stream_prepared = false;
> +
> + return 0;
> +}
> +
> +static struct snd_soc_dai_driver wsa881x_dais[] = {
> + [0] = {
is that [0] needed?
> + .name = "SPKR",
> + .id = 0,
> + .playback = {
> + .stream_name = "SPKR Playback",
> + .rate_max = 48000,
> + .rate_min = 48000,
> + .channels_min = 1,
> + .channels_max = 1,
> + },
> + .ops = &wsa881x_dai_ops,
> + },
> +};
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next prev parent reply other threads:[~2019-12-20 15:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-20 11:56 [alsa-devel] [PATCH v10 0/2] ASoC: codecs: Add WSA881x Smart Speaker amplifier support Srinivas Kandagatla
2019-12-20 11:56 ` [alsa-devel] [PATCH v10 1/2] dt-bindings: ASoC: Add WSA881x bindings Srinivas Kandagatla
2019-12-20 11:56 ` [alsa-devel] [PATCH v10 2/2] ASoC: codecs: add wsa881x amplifier support Srinivas Kandagatla
2019-12-20 15:45 ` Pierre-Louis Bossart [this message]
2019-12-20 16:31 ` Srinivas Kandagatla
2019-12-20 17:38 ` Pierre-Louis Bossart
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