The vendor driver allows setting baud-rates higher than 115200 baud. There is a check in the vendor driver which prevents using more than 115200 baud during startup, however it does not have such a check in .set_termios. Higher baud-rates are often used by the bluetooth modules embedded into the SDIO wifi chips (Amlogic devices use brcmfmac based wifi chips quite often, 2000000 baud seems to be a common value for the UART baud-rate in Amlogic's "libbt"). I have tested this on a Meson GXL device with uart_A (to which the bluetooth module is connected, where initialization times out with 115200 baud) and uart_AO (which I manually set to 2000000 baud and then connected with my USB UART adapter to that). Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> --- drivers/tty/serial/meson_uart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c index 6aea0f4a9165..60f16795d16b 100644 --- a/drivers/tty/serial/meson_uart.c +++ b/drivers/tty/serial/meson_uart.c @@ -364,7 +364,7 @@ static void meson_uart_set_termios(struct uart_port *port, writel(val, port->membase + AML_UART_CONTROL); - baud = uart_get_baud_rate(port, termios, old, 9600, 115200); + baud = uart_get_baud_rate(port, termios, old, 9600, 4000000); meson_uart_change_speed(port, baud); port->read_status_mask = AML_UART_TX_FIFO_WERR; -- 2.11.0 -- 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
