请问921600需要用DMA接收才不会丢数据吗？

昨天跑通了K210的UART中断，可以收发数据了，尝试了下921600的速率，数据2，3十个发的时候就会丢数据，感觉底层驱动改的有些问题，看了下论坛里的帖子，说921600需要用DMA接收才不会丢数据。。

uart中断函数

/ UART ISR /
static void uart_irq_handler(int irqno, void param)
{
rt_ubase_t isr;
uint8_t v_int_status;
struct rt_serial_device serial = (struct rt_serial_device )param;
struct device_uart uartls = serial->parent.user_data;

/* read interrupt status and clear it
if (uart->hw_base == UARTHS_BASE_ADDR)
{
if (uarths->ip.rxwm)
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}*/
if(irqno == IRQN_UARTHS_INTERRUPT)
{
if (uarths->ip.rxwm)
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}
else
{
v_int_status = uart[serial->config.uart_num]->IIR & 0xF;
if(v_int_status == UART_INTERRUPT_SEND )
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_TX_DONE);
else if(v_int_status == UART_INTERRUPT_RECEIVE || v_int_status == UART_INTERRUPT_CHARACTER_TIMEOUT)
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}
}中断在这里接收数据/ ISR for serial interrupt /
void rt_hw_serial_isr(struct rt_serial_device serial, int event)
{
switch (event & 0xff)
{
case RT_SERIAL_EVENT_RX_IND:
{
int ch = -1;
rt_base_t level;
struct rt_serial_rx_fifo rx_fifo;

/* interrupt mode receive */
    rx_fifo = (struct rt_serial_rx_fifo*)serial->serial_rx;
    RT_ASSERT(rx_fifo != RT_NULL);
    while (1)
    {
        ch = serial->ops->getc(serial);
        if (ch == -1) break;```

K210底层函数

int uartapb_getc(uart_device_number_t channel)
{
if(uart[channel]->LSR & 1)
return (char)(uart[channel]->RBR & 0xff);
else
return -1;

/ while (!(uart[channel]->LSR & 1))
continue;
return (char)(uart[channel]->RBR & 0xff);/
}

原本底层函数为屏蔽的那一段，但那样没有数据的时候，会死在while中，改成if判断，那样发现每获取一个字节，都会进两次uartapb_getc，感觉这个底层驱动有点问题。