linux-kernel - Re: [PATCH 2/4] ASoC: codecs: add wsa883x amplifier support

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Date:   Wed, 29 Jun 2022 17:09:28 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        broonie@...nel.org
Cc:     alsa-devel@...a-project.org, lgirdwood@...il.com,
        linux-kernel@...r.kernel.org, tiwai@...e.com
Subject: Re: [PATCH 2/4] ASoC: codecs: add wsa883x amplifier support

Thanks Pierre,

On 29/06/2022 16:03, Pierre-Louis Bossart wrote:
> 
>> +/* 4 ports */
>> +static struct sdw_dpn_prop wsa_sink_dpn_prop[WSA883X_MAX_SWR_PORTS] = {
>> +	{
>> +		/* DAC */
>> +		.num = 1,
>> +		.type = SDW_DPN_SIMPLE,
>> +		.min_ch = 1,
>> +		.max_ch = 1,
>> +		.simple_ch_prep_sm = true,
>> +		.read_only_wordlength = true,
>> +	}, {
> 
> nit-pick: it's unusual to see such opening brackets for structure
> initialization, usually there are on a new line.
> 
>> +		/* COMP */
>> +		.num = 2,
>> +		.type = SDW_DPN_SIMPLE,
>> +		.min_ch = 1,
>> +		.max_ch = 1,
>> +		.simple_ch_prep_sm = true,
>> +		.read_only_wordlength = true,
>> +	}, {
>> +		/* BOOST */
>> +		.num = 3,
>> +		.type = SDW_DPN_SIMPLE,
>> +		.min_ch = 1,
>> +		.max_ch = 1,
>> +		.simple_ch_prep_sm = true,
>> +		.read_only_wordlength = true,
>> +	}, {
>> +		/* VISENSE */
>> +		.num = 4,
>> +		.type = SDW_DPN_SIMPLE,
>> +		.min_ch = 1,
>> +		.max_ch = 1,
>> +		.simple_ch_prep_sm = true,
>> +		.read_only_wordlength = true,
>> +	}
>> +};
> 
>> +static int wsa883x_update_status(struct sdw_slave *slave,
>> +				 enum sdw_slave_status status)
>> +{
>> +	struct wsa883x_priv *wsa883x = dev_get_drvdata(&slave->dev);
>> +
>> +	if (status == SDW_SLAVE_ATTACHED && slave->dev_num > 0)
> 
> do you actually need to test if slave->dev_num is > 0?
> 
Few years back I think it was you who asked me to add this check.. :-)

https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2073074.html


> if I look at drivers/soundwire/bus.c, update_status cannot really be
> invoked with dev_num == 0.
> 
>> +		wsa883x_init(wsa883x);
>> +
>> +	return 0;
>> +}
>> +
> 
>> +static int __maybe_unused wsa883x_runtime_resume(struct device *dev)
>> +{
>> +	struct sdw_slave *slave = dev_to_sdw_dev(dev);
>> +	struct regmap *regmap = dev_get_regmap(dev, NULL);
>> +	struct wsa883x_priv *wsa883x = dev_get_drvdata(dev);
>> +	int ret;
>> +
>> +	ret = regulator_enable(wsa883x->vdd);
>> +	if (ret) {
>> +		dev_err(dev, "Failed to enable vdd regulator (%d)\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	gpiod_direction_output(wsa883x->sd_n, 1);
>> +
>> +	wait_for_completion_timeout(&slave->initialization_complete,
>> +				    msecs_to_jiffies(WSA883X_PROBE_TIMEOUT));
> 
> check for success? You don't want to enable regmap sync below if the
> device never successfully attached and initialized.

Yes, that might be possible, I can spin a fix for this.

thanks,
--srini
> 
>> +
>> +	usleep_range(20000, 20010);
>> +	regcache_cache_only(regmap, false);
>> +	regcache_sync(regmap);
>> +
>> +	return 0;
>> +}
>