linux-kernel - [PATCH 1/3] hwmon: spd5118: Do not fail resume on temporary I2C errors

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Message-ID: <20260110172003.13969-1-tinsaetadesse2015@gmail.com>
Date: Sat, 10 Jan 2026 20:19:23 +0300
From: Tinsae Tadesse <tinsaetadesse2015@...il.com>
To: linux@...ck-us.net
Cc: Tinsae Tadesse <tinsaetadesse2015@...il.com>,
	linux-hwmon@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] hwmon: spd5118: Do not fail resume on temporary I2C errors

SPD5118 DDR5 temperature sensors may be temporarily unavailable
during s2idle resume. Ignore temporary -ENXIO and -EIO errors during resume and allow
register synchronization to be retried later.

Signed-off-by: Tinsae Tadesse <tinsaetadesse2015@...il.com>
---
 drivers/hwmon/spd5118.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/spd5118.c b/drivers/hwmon/spd5118.c
index 5da44571b6a0..ec9f14f6e0df 100644
--- a/drivers/hwmon/spd5118.c
+++ b/drivers/hwmon/spd5118.c
@@ -512,9 +512,15 @@ static int spd5118_resume(struct device *dev)
 {
 	struct spd5118_data *data = dev_get_drvdata(dev);
 	struct regmap *regmap = data->regmap;
+	int ret;
 
 	regcache_cache_only(regmap, false);
-	return regcache_sync(regmap);
+	ret = regcache_sync(regmap);
+	if(ret == -ENXIO || ret == -EIO) {
+		dev_warn(dev, "SPD hub not responding on resume (%d), deferring init\n", ret);
+		return 0;
+	}
+	return ret;
 }
 
 static DEFINE_SIMPLE_DEV_PM_OPS(spd5118_pm_ops, spd5118_suspend, spd5118_resume);
-- 
2.47.3