linux-kernel - Re: [PATCH v4] ASoC: codecs: wsa881x: add runtime pm support

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Message-ID: <b1b0a8b9-5fc2-bfe1-dfde-692a0a7ac34a@linux.intel.com>
Date:   Wed, 20 Apr 2022 12:59:12 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        broonie@...nel.org
Cc:     alsa-devel@...a-project.org, lgirdwood@...il.com,
        linux-kernel@...r.kernel.org, tiwai@...e.com,
        quic_srivasam@...cinc.com
Subject: Re: [PATCH v4] ASoC: codecs: wsa881x: add runtime pm support

Hi Srini,

> +static int __maybe_unused wsa881x_runtime_resume(struct device *dev)
> +{
> +	struct sdw_slave *slave = dev_to_sdw_dev(dev);
> +	struct regmap *regmap = dev_get_regmap(dev, NULL);
> +	struct wsa881x_priv *wsa881x = dev_get_drvdata(dev);
> +
> +	gpiod_direction_output(wsa881x->sd_n, 1);
> +
> +	wait_for_completion_timeout(&slave->initialization_complete,
> +				    msecs_to_jiffies(WSA881X_PROBE_TIMEOUT));

while I was revisiting pm_runtime support, I also saw that this codec driver is the only one that doesn't check for errors

max98373-sdw.c: time = wait_for_completion_timeout(&slave->initialization_complete,

rt1308-sdw.c:   time = wait_for_completion_timeout(&slave->initialization_complete,

rt1316-sdw.c:   time = wait_for_completion_timeout(&slave->initialization_complete,

rt5682-sdw.c:   time = wait_for_completion_timeout(&slave->initialization_complete,

rt5682.c:                       &slave->initialization_complete,

rt700-sdw.c:    time = wait_for_completion_timeout(&slave->initialization_complete,

rt711-sdca-sdw.c:       time = wait_for_completion_timeout(&slave->initialization_complete,

rt711-sdw.c:    time = wait_for_completion_timeout(&slave->initialization_complete,

rt715-sdw.c:    time = wait_for_completion_timeout(&slave->initialization_complete,

wsa881x.c:      wait_for_completion_timeout(&slave->initialization_complete,


If the attachment fails for some reason, you probably want to avoid starting regmap syncs that will fail by construction, no?

> +
> +	regcache_cache_only(regmap, false);
> +	regcache_sync(regmap);
> +
> +	return 0;
> +}