diff options
Diffstat (limited to 'drivers/serial/serial_stm32.c')
| -rw-r--r-- | drivers/serial/serial_stm32.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/serial/serial_stm32.c b/drivers/serial/serial_stm32.c index dfef0d47e5..e2eeadef9d 100644 --- a/drivers/serial/serial_stm32.c +++ b/drivers/serial/serial_stm32.c @@ -43,10 +43,19 @@ static int stm32_serial_getc(struct udevice *dev) struct stm32x7_serial_platdata *plat = dev_get_platdata(dev); bool stm32f4 = plat->uart_info->stm32f4; fdt_addr_t base = plat->base; + u32 isr = readl(base + ISR_OFFSET(stm32f4)); - if ((readl(base + ISR_OFFSET(stm32f4)) & USART_SR_FLAG_RXNE) == 0) + if ((isr & USART_SR_FLAG_RXNE) == 0) return -EAGAIN; + if (isr & USART_SR_FLAG_ORE) { + if (!stm32f4) + setbits_le32(base + ICR_OFFSET, USART_ICR_OREF); + else + readl(base + RDR_OFFSET(stm32f4)); + return -EIO; + } + return readl(base + RDR_OFFSET(stm32f4)); } @@ -107,11 +116,9 @@ static int stm32_serial_probe(struct udevice *dev) return plat->clock_rate; }; - /* Disable uart-> disable overrun-> enable uart */ + /* Disable uart-> enable fifo-> enable uart */ clrbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_RE | USART_CR1_TE | BIT(uart_enable_bit)); - if (plat->uart_info->has_overrun_disable) - setbits_le32(base + CR3_OFFSET(stm32f4), USART_CR3_OVRDIS); if (plat->uart_info->has_fifo) setbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_FIFOEN); setbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_RE | USART_CR1_TE | |