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i2c: stm32f7: recover the bus on access timeout

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commit b933d1faf8fa30d16171bcff404e39c41b2a7c84 upstream.

When getting an access timeout, ensure that the bus is in a proper
state prior to returning the error.

Fixes: aeb068c572 ("i2c: i2c-stm32f7: add driver")
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@foss.st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alain Volmat 2021-09-20 17:21:30 +02:00 • committed by Greg Kroah-Hartman
commit 9fce2ead76
1 changed files with 2 additions and 0 deletions
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2
drivers/i2c/busses/i2c-stm32f7.c
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@ -1602,6 +1602,7 @@ 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;
}
@ -1659,6 +1660,7 @@ 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;
}