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Subject[PATCH 6/6] i2c: i2c-stm32f7: Implement I2C recovery mechanism
Date
Feature prevents I2C lock-ups. Mechanism resets I2C state machine
and releases SCL/SDA signals but preserves I2C registers.

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
---
Version history:
v1:
* Initial
---
---
drivers/i2c/busses/i2c-stm32f7.c | 32 +++++++++++++++++++++++++++++---
1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 593efa5..428bf96 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -718,6 +718,20 @@ static void stm32f7_i2c_smbus_reload(struct stm32f7_i2c_dev *i2c_dev)
writel_relaxed(cr2, i2c_dev->base + STM32F7_I2C_CR2);
}

+static int stm32f7_i2c_recover_bus(struct i2c_adapter *i2c_adap)
+{
+ struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(i2c_adap);
+
+ dev_info(i2c_dev->dev, "Trying to recover bus\n");
+
+ stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1,
+ STM32F7_I2C_CR1_PE);
+
+ stm32f7_i2c_hw_config(i2c_dev);
+
+ return 0;
+}
+
static int stm32f7_i2c_wait_free_bus(struct stm32f7_i2c_dev *i2c_dev)
{
u32 status;
@@ -727,12 +741,18 @@ static int stm32f7_i2c_wait_free_bus(struct stm32f7_i2c_dev *i2c_dev)
status,
!(status & STM32F7_I2C_ISR_BUSY),
10, 1000);
+ if (!ret)
+ return 0;
+
+ dev_info(i2c_dev->dev, "bus busy\n");
+
+ ret = i2c_recover_bus(&i2c_dev->adap);
if (ret) {
- dev_dbg(i2c_dev->dev, "bus busy\n");
- ret = -EBUSY;
+ dev_err(i2c_dev->dev, "Failed to recover the bus (%d)\n", ret);
+ return ret;
}

- return ret;
+ return -EBUSY;
}

static void stm32f7_i2c_xfer_msg(struct stm32f7_i2c_dev *i2c_dev,
@@ -1476,6 +1496,7 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
if (status & STM32F7_I2C_ISR_BERR) {
dev_err(dev, "<%s>: Bus error\n", __func__);
writel_relaxed(STM32F7_I2C_ICR_BERRCF, base + STM32F7_I2C_ICR);
+ i2c_recover_bus(&i2c_dev->adap);
f7_msg->result = -EIO;
}

@@ -1760,6 +1781,10 @@ static struct i2c_algorithm stm32f7_i2c_algo = {
.unreg_slave = stm32f7_i2c_unreg_slave,
};

+static struct i2c_bus_recovery_info stm32f7_i2c_recovery_info = {
+ .recover_bus = stm32f7_i2c_recover_bus,
+};
+
static int stm32f7_i2c_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
@@ -1879,6 +1904,7 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
adap->algo = &stm32f7_i2c_algo;
adap->dev.parent = &pdev->dev;
adap->dev.of_node = pdev->dev.of_node;
+ adap->bus_recovery_info = &stm32f7_i2c_recovery_info;

init_completion(&i2c_dev->complete);

--
2.7.4
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