| Message ID | 20170115223255.10350-2-martin.blumenstingl@googlemail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Am 15.01.2017 um 23:32 schrieb Martin Blumenstingl: > 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@googlemail.com> Tested-by: Andreas Färber <afaerber@suse.de> Thanks, Andreas
Martin Blumenstingl <martin.blumenstingl@googlemail.com> writes: > 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@googlemail.com> Acked-by: Kevin Hilman <khilman@baylibre.com>
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;
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@googlemail.com> --- drivers/tty/serial/meson_uart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)