linux-kernel - [PATCH v1 1/1] i2c: npcm: Add clock toggle in case of stuck bus during init in npcm_i2c_init

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Message-ID: <20250324203233.1266772-2-mohammed.0.elbadry@gmail.com>
Date: Mon, 24 Mar 2025 20:32:03 +0000
From: mohammed.0.elbadry@...il.com
To: 
Cc: Tali Perry <tali.perry1@...il.com>,
	Mohammed Elbadry <mohammed.0.elbadry@...il.com>,
	Avi Fishman <avifishman70@...il.com>,
	Tomer Maimon <tmaimon77@...il.com>,
	Patrick Venture <venture@...gle.com>,
	Nancy Yuen <yuenn@...gle.com>,
	Benjamin Fair <benjaminfair@...gle.com>,
	Andi Shyti <andi.shyti@...nel.org>,
	openbmc@...ts.ozlabs.org,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/1] i2c: npcm: Add clock toggle in case of stuck bus during init in npcm_i2c_init_module

From: Tali Perry <tali.perry1@...il.com>

Signed-off-by: Tali Perry <tali.perry1@...il.com>
Signed-off-by: Mohammed Elbadry <mohammed.0.elbadry@...il.com>
---
 drivers/i2c/busses/i2c-npcm7xx.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c
index 3ad6124be80f..78c85015d955 100644
--- a/drivers/i2c/busses/i2c-npcm7xx.c
+++ b/drivers/i2c/busses/i2c-npcm7xx.c
@@ -2043,10 +2043,14 @@ static int npcm_i2c_init_module(struct npcm_i2c *bus, enum i2c_mode mode,
 
 	/* Check HW is OK: SDA and SCL should be high at this point. */
 	if ((npcm_i2c_get_SDA(&bus->adap) == 0) || (npcm_i2c_get_SCL(&bus->adap) == 0)) {
-		dev_err(bus->dev, "I2C%d init fail: lines are low\n", bus->num);
-		dev_err(bus->dev, "SDA=%d SCL=%d\n", npcm_i2c_get_SDA(&bus->adap),
-			npcm_i2c_get_SCL(&bus->adap));
-		return -ENXIO;
+		dev_warn(bus->dev, " I2C%d SDA=%d SCL=%d, attempt recover\n", bus->num,
+				 npcm_i2c_get_SDA(&bus->adap), npcm_i2c_get_SCL(&bus->adap));
+		if (npcm_i2c_recovery_tgclk(&bus->adap)) {
+			dev_err(bus->dev, "I2C%d init fail: lines are low\n", bus->num);
+			dev_err(bus->dev, "SDA=%d SCL=%d\n", npcm_i2c_get_SDA(&bus->adap),
+				npcm_i2c_get_SCL(&bus->adap));
+			return -ENXIO;
+		}
 	}
 
 	npcm_i2c_int_enable(bus, true);
-- 
2.34.1

**Reported-by: Mohammed Elbadry <mohammed.0.elbadry@...il.com>**
**Tested-by: Mohammed Elbadry <mohammed.0.elbadry@...il.com>**