From: Carlos Song <carlos.song@nxp.com>

Mark the I2C adapter as suspended during system suspend to block further
transfers, and resume it on system resume. This prevents potential hangs
when the hardware is powered down but clients still attempt I2C transfers.

Fixes: 1ee867e465c1 ("i2c: imx-lpi2c: add target mode support")
Cc: stable@vger.kernel.org
Signed-off-by: Carlos Song <carlos.song@nxp.com>
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index a01c23696481..bf8c1ce1c7ff 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -1635,7 +1635,16 @@ static int __maybe_unused lpi2c_runtime_resume(struct device *dev)
 
 static int __maybe_unused lpi2c_suspend_noirq(struct device *dev)
 {
-	return pm_runtime_force_suspend(dev);
+	struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
+	int ret;
+
+	ret = pm_runtime_force_suspend(dev);
+	if (ret)
+		return ret;
+
+	i2c_mark_adapter_suspended(&lpi2c_imx->adapter);
+
+	return 0;
 }
 
 static int __maybe_unused lpi2c_resume_noirq(struct device *dev)
@@ -1655,6 +1664,8 @@ static int __maybe_unused lpi2c_resume_noirq(struct device *dev)
 	if (lpi2c_imx->target)
 		lpi2c_imx_target_init(lpi2c_imx);
 
+	i2c_mark_adapter_resumed(&lpi2c_imx->adapter);
+
 	return 0;
 }
 
-- 
2.43.0