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drivers: i2c: stm32: Disable suspend to idle during transaction 

Suspend-to-idle stops I2C module clocks, which must remain active during
transaction

Signed-off-by: Petr Hlineny <development@hlineny.cz>
This commit is contained in:
Petr Hlineny 2023-09-22 15:25:11 +02:00 committed by Carles Cufí
parent bc1a988f9d
commit a97c825d64
1 changed files with 6 additions and 4 deletions
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10
drivers/i2c/i2c_ll_stm32.c
View File

@ -9,6 +9,7 @@
#include <zephyr/drivers/clock_control.h>
#include <zephyr/pm/device.h>
#include <zephyr/pm/device_runtime.h>
#include <zephyr/pm/policy.h>
#include <zephyr/sys/util.h>
#include <zephyr/kernel.h>
#include <soc.h>
@ -173,10 +174,11 @@ static int i2c_stm32_transfer(const struct device *dev, struct i2c_msg *msg,
/* Prevent driver from being suspended by PM until I2C transaction is complete */
#ifdef CONFIG_PM_DEVICE_RUNTIME
(void)pm_device_runtime_get(dev);
#else
pm_device_busy_set(dev);
#endif
/* Prevent the clocks to be stopped during the i2c transaction */
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
current = msg;
while (num_msgs > 0) {
@ -194,10 +196,10 @@ static int i2c_stm32_transfer(const struct device *dev, struct i2c_msg *msg,
num_msgs--;
}
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
#ifdef CONFIG_PM_DEVICE_RUNTIME
(void)pm_device_runtime_put(dev);
#else
pm_device_busy_clear(dev);
#endif
k_sem_give(&data->bus_mutex);