diff options
Diffstat (limited to 'drivers/serial/serial_stm32.c')
| -rw-r--r-- | drivers/serial/serial_stm32.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/serial/serial_stm32.c b/drivers/serial/serial_stm32.c index 0085113f67..23d476fba2 100644 --- a/drivers/serial/serial_stm32.c +++ b/drivers/serial/serial_stm32.c @@ -22,6 +22,14 @@ #include "serial_stm32.h" #include <dm/device_compat.h> +/* + * At 115200 bits/s + * 1 bit = 1 / 115200 = 8,68 us + * 8 bits = 69,444 us + * 10 bits are needed for worst case (8 bits + 1 start + 1 stop) = 86.806 us + */ +#define ONE_BYTE_B115200_US 87 + static void _stm32_serial_setbrg(fdt_addr_t base, struct stm32_uart_info *uart_info, u32 clock_rate, @@ -209,12 +217,10 @@ static int stm32_serial_probe(struct udevice *dev) * before uart initialization, wait for TC bit (Transmission Complete) * in case there is still chars from previous bootstage to transmit */ - ret = read_poll_timeout(readl, isr, isr & USART_ISR_TC, 10, 150, - plat->base + ISR_OFFSET(stm32f4)); - if (ret) { - clk_disable(&clk); - return ret; - } + ret = read_poll_timeout(readl, isr, isr & USART_ISR_TC, 50, + 16 * ONE_BYTE_B115200_US, plat->base + ISR_OFFSET(stm32f4)); + if (ret) + dev_dbg(dev, "FIFO not empty, some character can be lost (%d)\n", ret); ret = reset_get_by_index(dev, 0, &reset); if (!ret) { |