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drivers: i2c_ll_stm32_v1: Reset i2c device on read/write error

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Reset the i2c device when read or write return with an error
code. This is to bring the i2c hardware back into a known
state after a hardware error (like EMC spikes) caused
the device to lock up.

Signed-off-by: Erwin Rol <erwin@erwinrol.com>
This commit is contained in:
Erwin Rol 2020-08-18 18:41:12 +02:00 committed by Maureen Helm
parent 9ac8dcf5a7
commit dce9580490
1 changed files with 18 additions and 3 deletions
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21
drivers/i2c/i2c_ll_stm32_v1.c
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@ -66,6 +66,8 @@ static void stm32_i2c_enable_transfer_interrupts(struct device *dev)
LL_I2C_EnableIT_BUF(i2c);
}
#endif /* CONFIG_I2C_STM32_INTERRUPT */
static void stm32_i2c_reset(struct device *dev)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
@ -77,7 +79,9 @@ static void stm32_i2c_reset(struct device *dev)
/* disable i2c and disable IRQ's */
LL_I2C_Disable(i2c);
#ifdef CONFIG_I2C_STM32_INTERRUPT
stm32_i2c_disable_transfer_interrupts(dev);
#endif
/* save all important registers before reset */
cr1 = LL_I2C_ReadReg(i2c, CR1);
@ -109,7 +113,6 @@ static void stm32_i2c_reset(struct device *dev)
#endif
}
#endif /* CONFIG_I2C_STM32_INTERRUPT */
static void stm32_i2c_master_finish(struct device *dev)
{
@ -714,6 +717,7 @@ int32_t stm32_i2c_msg_write(struct device *dev, struct i2c_msg *msg,
uint32_t len = msg->len;
uint16_t timeout;
uint8_t *buf = msg->buf;
int32_t res;
msg_init(dev, msg, next_msg_flags, saddr, I2C_REQUEST_WRITE);
@ -794,7 +798,12 @@ int32_t stm32_i2c_msg_write(struct device *dev, struct i2c_msg *msg,
end:
check_errors(dev, __func__);
return msg_end(dev, next_msg_flags, __func__);
res = msg_end(dev, next_msg_flags, __func__);
if (res < 0) {
stm32_i2c_reset(dev);
}
return res;
}
int32_t stm32_i2c_msg_read(struct device *dev, struct i2c_msg *msg,
@ -806,6 +815,7 @@ int32_t stm32_i2c_msg_read(struct device *dev, struct i2c_msg *msg,
uint32_t len = msg->len;
uint16_t timeout;
uint8_t *buf = msg->buf;
int32_t res;
msg_init(dev, msg, next_msg_flags, saddr, I2C_REQUEST_READ);
@ -950,7 +960,12 @@ int32_t stm32_i2c_msg_read(struct device *dev, struct i2c_msg *msg,
}
end:
check_errors(dev, __func__);
return msg_end(dev, next_msg_flags, __func__);
res = msg_end(dev, next_msg_flags, __func__);
if (res < 0) {
stm32_i2c_reset(dev);
}
return res;
}
#endif /* CONFIG_I2C_STM32_INTERRUPT */