The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From b933d1faf8fa30d16171bcff404e39c41b2a7c84 Mon Sep 17 00:00:00 2001
From: Alain Volmat <alain.volmat@xxxxxxxxxxx>
Date: Mon, 20 Sep 2021 17:21:30 +0200
Subject: [PATCH] i2c: stm32f7: recover the bus on access timeout
When getting an access timeout, ensure that the bus is in a proper
state prior to returning the error.
Fixes: aeb068c57214 ("i2c: i2c-stm32f7: add driver")
Signed-off-by: Alain Volmat <alain.volmat@xxxxxxxxxxx>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@xxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index ed977b6f7ab6..ad3459a3bc5e 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -1712,6 +1712,7 @@ static int stm32f7_i2c_xfer(struct i2c_adapter *i2c_adap,
i2c_dev->msg->addr);
if (i2c_dev->use_dma)
dmaengine_terminate_all(dma->chan_using);
+ stm32f7_i2c_wait_free_bus(i2c_dev);
ret = -ETIMEDOUT;
}
@@ -1769,6 +1770,7 @@ static int stm32f7_i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
dev_dbg(dev, "Access to slave 0x%x timed out\n", f7_msg->addr);
if (i2c_dev->use_dma)
dmaengine_terminate_all(dma->chan_using);
+ stm32f7_i2c_wait_free_bus(i2c_dev);
ret = -ETIMEDOUT;
goto pm_free;
}
