mirrors/u-boot
1
0
Fork 0
mirror of https://source.denx.de/u-boot/u-boot.git synced 2026-05-05 12:46:14 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

serial: stm32: BRR must be set only when usart is disable

Browse Source 
To avoid spurious chars, BRR register must only be written when
USART is disabled.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
This commit is contained in:
Patrice Chotard 2023-05-31 08:01:31 +02:00
parent b4dbc5d65a
commit 8ab9e8ffdf
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/serial/serial_stm32.c
View File

@ -29,6 +29,10 @@ static void _stm32_serial_setbrg(fdt_addr_t base,
{
bool stm32f4 = uart_info->stm32f4;
u32 int_div, mantissa, fraction, oversampling;
u8 uart_enable_bit = uart_info->uart_enable_bit;
/* BRR register must be set when uart is disabled */
clrbits_le32(base + CR1_OFFSET(stm32f4), BIT(uart_enable_bit));
int_div = DIV_ROUND_CLOSEST(clock_rate, baudrate);
@ -44,6 +48,8 @@ static void _stm32_serial_setbrg(fdt_addr_t base,
fraction = int_div % oversampling;
writel(mantissa | fraction, base + BRR_OFFSET(stm32f4));
setbits_le32(base + CR1_OFFSET(stm32f4), BIT(uart_enable_bit));
}
static int stm32_serial_setbrg(struct udevice *dev, int baudrate)