drivers: i2c_stm32_v2: Bus error errata fix

erian747 · jhedberg · commit 789e1d2d4311 · 2025-09-30T17:59:04.000+03:00
Don't abort transaction on bus error in master mode
according to errata sheet

Signed-off-by: Erik Andersson &lt;erian747@gmail.com&gt;
diff --git a/drivers/i2c/i2c_ll_stm32_v2.c b/drivers/i2c/i2c_ll_stm32_v2.c
@@ -631,10 +631,14 @@ int i2c_stm32_error(const struct device *dev)
 		goto end;
 	}
 
+	/* Don't end a transaction on bus error in master mode
+	 * as errata sheet says that spurious false detections
+	 * of BERR can happen which shall be ignored.
+	 * If a real Bus Error occurs, transaction will time out.
+	 */
 	if (LL_I2C_IsActiveFlag_BERR(i2c)) {
 		LL_I2C_ClearFlag_BERR(i2c);
 		data->current.is_err = 1U;
-		goto end;
 	}
 
 #if defined(CONFIG_SMBUS_STM32_SMBALERT)

Original file line number	Diff line number	Diff line change
`@@ -631,10 +631,14 @@ int i2c_stm32_error(const struct device *dev)`
`631`	`631`	`goto end;`
`632`	`632`	`}`
`633`	`633`
	`634`	`+ /* Don't end a transaction on bus error in master mode`
	`635`	`+ * as errata sheet says that spurious false detections`
	`636`	`+ * of BERR can happen which shall be ignored.`
	`637`	`+ * If a real Bus Error occurs, transaction will time out.`
	`638`	`+ */`
`634`	`639`	`if (LL_I2C_IsActiveFlag_BERR(i2c)) {`
`635`	`640`	`LL_I2C_ClearFlag_BERR(i2c);`
`636`	`641`	`data->current.is_err = 1U;`
`637`		`- goto end;`
`638`	`642`	`}`
`639`	`643`
`640`	`644`	`#if defined(CONFIG_SMBUS_STM32_SMBALERT)`