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driver: i2c: npcx: reset i2c semaphore before start transaction.

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This CL reset i2c event-completed semaphore before starting
transactions. Some interrupt events such as BUS_ERROR might change its
counter when i2c bus is idle. It causes that the driver cannot wait
for the event completed and return immediately.

Signed-off-by: Mulin Chao <mlchao@nuvoton.com>
This commit is contained in:
Mulin Chao 2021-02-04 21:47:02 -08:00 committed by Anas Nashif
parent 5ccb89c3bc
commit 7c8cb78b23
1 changed files with 7 additions and 0 deletions
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7
drivers/i2c/i2c_npcx_controller.c
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@ -790,6 +790,13 @@ int npcx_i2c_ctrl_transfer(const struct device *i2c_dev, struct i2c_msg *msgs,
data->trans_err = 0;
data->addr = addr;
/*
* Reset i2c event-completed semaphore before starting transactions.
* Some interrupt events such as BUS_ERROR might change its counter
* when bus is idle.
*/
k_sem_reset(&data->sync_sem);
for (i = 0U; i < num_msgs; i++) {
struct i2c_msg *msg = msgs + i;