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

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Message-Id: <20220630130023.9308-1-srinivas.kandagatla@linaro.org>
Date:   Thu, 30 Jun 2022 14:00:22 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     broonie@...nel.org
Cc:     alsa-devel@...a-project.org, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com, linux-kernel@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Subject: [PATCH 1/2] ASoC: codecs: wsa881x: handle timeouts in resume path

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>
---
 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);
-- 
2.25.1