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tty: serial: meson: allow baud-rates higher than 115200 

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>
Tested-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
zero-colors
Martin Blumenstingl 2017-01-15 23:32:52 +01:00 committed by Greg Kroah-Hartman
parent 9ed90d2044
commit 8c9faa556a
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/meson_uart.c
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@ -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;