blob: 3600528b44eb12f269d4c79613954bec306ad117 [file] [log] [blame]
From 7a9c48a31ca1028e5281f468906bcce353363bce Mon Sep 17 00:00:00 2001
From: Chris Packham <>
Date: Thu, 2 Jul 2020 10:39:11 +1200
Subject: [PATCH] i2c: algo-pca: Add 0x78 as SCL stuck low status for PCA9665
commit cd217f2300793a106b49c7dfcbfb26e348bc7593 upstream.
The PCA9665 datasheet says that I2CSTA = 78h indicates that SCL is stuck
low, this differs to the PCA9564 which uses 90h for this indication.
Treat either 0x78 or 0x90 as an indication that the SCL line is stuck.
Based on looking through the PCA9564 and PCA9665 datasheets this should
be safe for both chips. The PCA9564 should not return 0x78 for any valid
state and the PCA9665 should not return 0x90.
Fixes: eff9ec95efaa ("i2c-algo-pca: Add PCA9665 support")
Signed-off-by: Chris Packham <>
Reviewed-by: Andy Shevchenko <>
Signed-off-by: Wolfram Sang <>
Signed-off-by: Paul Gortmaker <>
diff --git a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c
index 5ac93f41bfec..8ea850eed18f 100644
--- a/drivers/i2c/algos/i2c-algo-pca.c
+++ b/drivers/i2c/algos/i2c-algo-pca.c
@@ -314,7 +314,8 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
DEB2("BUS ERROR - SDA Stuck low\n");
goto out;
- case 0x90: /* Bus error - SCL stuck low */
+ case 0x78: /* Bus error - SCL stuck low (PCA9665) */
+ case 0x90: /* Bus error - SCL stuck low (PCA9564) */
DEB2("BUS ERROR - SCL Stuck low\n");
goto out;