linux-kernel - [PATCH 2/2] ASoC: codecs: wsa883x: handle timeouts in resume path

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Date:   Thu, 30 Jun 2022 14:00:23 +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 2/2] ASoC: codecs: wsa883x: 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: 43b8c7dc85a1 ("ASoC: codecs: add wsa883x amplifier support")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 sound/soc/codecs/wsa883x.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/wsa883x.c b/sound/soc/codecs/wsa883x.c
index e8f519e89213..40c7d64a9c41 100644
--- a/sound/soc/codecs/wsa883x.c
+++ b/sound/soc/codecs/wsa883x.c
@@ -1455,6 +1455,7 @@ 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);
+	unsigned long time;
 	int ret;
 
 	ret = regulator_enable(wsa883x->vdd);
@@ -1465,8 +1466,14 @@ static int __maybe_unused wsa883x_runtime_resume(struct device *dev)
 
 	gpiod_direction_output(wsa883x->sd_n, 1);
 
-	wait_for_completion_timeout(&slave->initialization_complete,
-				    msecs_to_jiffies(WSA883X_PROBE_TIMEOUT));
+	time = wait_for_completion_timeout(&slave->initialization_complete,
+					   msecs_to_jiffies(WSA883X_PROBE_TIMEOUT));
+	if (!time) {
+		dev_err(dev, "Initialization not complete, timed out\n");
+		gpiod_direction_output(wsa883x->sd_n, 0);
+		regulator_disable(wsa883x->vdd);
+		return -ETIMEDOUT;
+	}
 
 	usleep_range(20000, 20010);
 	regcache_cache_only(regmap, false);
-- 
2.25.1