linux-kernel - Re: [PATCH 1/2] ASoC: codecs: wsa881x: handle timeouts in resume path

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Date:   Thu, 30 Jun 2022 08:09:39 -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, perex@...ex.cz,
        tiwai@...e.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ASoC: codecs: wsa881x: handle timeouts in resume path



On 6/30/22 08:00, Srinivas Kandagatla wrote:
> Currently we do not check if SoundWire slave initialization timeout
> expired before continuing to access its registers.
> 
> Its possible that the registers are not accessible if timeout is
> expired. Handle this by returning timeout in resume path.
> 
> Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> Fixes: 8dd552458361 ("ASoC: codecs: wsa881x: add runtime pm support")
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

For the two patches

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

> ---
>  sound/soc/codecs/wsa881x.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/codecs/wsa881x.c b/sound/soc/codecs/wsa881x.c
> index dc954b85a988..6c8b1db649b8 100644
> --- a/sound/soc/codecs/wsa881x.c
> +++ b/sound/soc/codecs/wsa881x.c
> @@ -1173,11 +1173,17 @@ 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);
> +	unsigned long time;
>  
>  	gpiod_direction_output(wsa881x->sd_n, 1);
>  
> -	wait_for_completion_timeout(&slave->initialization_complete,
> -				    msecs_to_jiffies(WSA881X_PROBE_TIMEOUT));
> +	time = wait_for_completion_timeout(&slave->initialization_complete,
> +					   msecs_to_jiffies(WSA881X_PROBE_TIMEOUT));
> +	if (!time) {
> +		dev_err(dev, "Initialization not complete, timed out\n");
> +		gpiod_direction_output(wsa881x->sd_n, 0);
> +		return -ETIMEDOUT;
> +	}
>  
>  	regcache_cache_only(regmap, false);
>  	regcache_sync(regmap);