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From: Fugang Duan <b38611@xxxxxxxxxxxxx> Sent: Monday, May 04, 2015 3:56 PM
> To: gregkh@xxxxxxxxxxxxxxxxxxx
> Cc: linux-serial@xxxxxxxxxxxxxxx; Duan Fugang-B38611
> Subject: [PATCH] serial: core: don't set console cflag to zero
>
> From: "Fugang Duan" <B38611@xxxxxxxxxxxxx>
>
> In android without shell environment (androidboot.selinux enable), do
> suspend/resume test, console terminal has no message print out. The issue
> is reproduced at i.MX serial platforms like i.MX6Q/DL/SX.
>
> In common code, cons->cflag is cleared to zero in .uart_port_startup(),
> but after resume back, use the cons->cflag to set termios.
> ......................
> uart_port_startup->
> uport->cons->cflag = 0;
>
> uart_resume_port()->
> termios.c_cflga = uport->cons->cflag;
> ...
> uport->ops->set_termios(uport, &termios, NULL); ......................
>
> If the console baud rate is 115200 bps, after Android resume back, the
> console baud rate is initialized to 9600 bps. So the patch save the
> console cflag.
>
> Signed-off-by: Fugang Duan <B38611@xxxxxxxxxxxxx>
> ---
> drivers/tty/serial/serial_core.c | 5 ++---
> 1 files changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/tty/serial/serial_core.c
> b/drivers/tty/serial/serial_core.c
> index 0b7bb12..4b21091 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -162,10 +162,9 @@ static int uart_port_startup(struct tty_struct *tty,
> struct uart_state *state,
>
> retval = uport->ops->startup(uport);
> if (retval == 0) {
> - if (uart_console(uport) && uport->cons->cflag) {
> + if (uart_console(uport) && uport->cons->cflag)
> tty->termios.c_cflag = uport->cons->cflag;
> - uport->cons->cflag = 0;
> - }
> +
> /*
> * Initialise the hardware port settings.
> */
> --
> 1.7.8
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