DW_UART_RE_EN
u32 re_en = dw8250_readl_ext(p, DW_UART_RE_EN);
dw8250_writel_ext(p, DW_UART_RE_EN, 0);
dw8250_writel_ext(p, DW_UART_RE_EN, re_en);
dw8250_writel_ext(p, DW_UART_RE_EN, 1);
dw8250_writel_ext(p, DW_UART_RE_EN, 1);
reg = dw8250_readl_ext(p, DW_UART_RE_EN);
dw8250_writel_ext(p, DW_UART_RE_EN, 0);