On Mon, Nov 20, 2017 at 03:44:13PM +0000, Ed Blake wrote: > On 20/11/17 14:40, Shuyu Wei wrote: > > dw8250_set_termios is causing problems for rk3188 on my radxa board. > > It's using a fixed clock at 24M, not baud*16 in dw8250_set_termios. > > I'm not sure if other rk3xxx chips are facing the same problem. > > > > Signed-off-by Wei Shuyu <wsy@xxxxxxxxxx> > > --- > > drivers/tty/serial/8250/8250_dw.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c > > index 5bb0c42c88dd..e760a5c1f3f6 100644 > > --- a/drivers/tty/serial/8250/8250_dw.c > > +++ b/drivers/tty/serial/8250/8250_dw.c > > @@ -340,6 +340,9 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data) > > data->skip_autocfg = true; > > } > > #endif > > + if (of_device_is_compatible(np, "rockchip,rk3188-uart")) { > > + p->set_termios = NULL; > > + } > > if (of_device_is_big_endian(p->dev->of_node)) { > > p->iotype = UPIO_MEM32BE; > > p->serial_in = dw8250_serial_in32be; > > Can you provide more details on the problem you're trying to solve? Hi Ed, Current dw8250_set_termios() trys to set p->uartclk and d->clk to baud*16, which is incorrect for rk3188. It should be a fixed 24000000. The incorrect value will result in a wrong baud rate, generating bad bytes on my serial console. Heikki Krogerus had worried about this, see https://patchwork.kernel.org/patch/9306275/. -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html