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drivers: serial: Reset UART using RCC before initialization

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In multi-image environment, after jump to the image we can have UART in
unexpected state. Reset UART to default state to make sure that UART is
initialized properly and won't cause system to crash or hang.

Signed-off-by: Patryk Duda <pdk@semihalf.com>
This commit is contained in:
Patryk Duda 2022-10-28 14:25:13 +02:00 • committed by Marti Bolivar
commit 1aebcec02f
3 changed files with 13 additions and 0 deletions
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10
drivers/serial/uart_stm32.c
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@ -21,6 +21,7 @@
#include <zephyr/init.h>
#include <zephyr/drivers/uart.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/reset.h>
#include <zephyr/pm/policy.h>
#include <zephyr/pm/device.h>
@ -1620,6 +1621,14 @@ static int uart_stm32_init(const struct device *dev)
LL_USART_Disable(config->usart);
if (!device_is_ready(data->reset.dev)) {
LOG_ERR("reset controller not ready");
return -ENODEV;
}
/* Reset UART to default state using RCC */
reset_line_toggle_dt(&data->reset);
/* TX/RX direction */
LL_USART_SetTransferDirection(config->usart,
LL_USART_DIRECTION_TX_RX);
@ -1896,6 +1905,7 @@ static const struct uart_stm32_config uart_stm32_cfg_##index = { \
\
static struct uart_stm32_data uart_stm32_data_##index = { \
.baud_rate = DT_INST_PROP(index, current_speed), \
.reset = RESET_DT_SPEC_GET(DT_DRV_INST(index)), \
UART_DMA_CHANNEL(index, rx, RX, PERIPHERAL, MEMORY) \
UART_DMA_CHANNEL(index, tx, TX, MEMORY, PERIPHERAL) \
}; \