Commit 48422152 authored by Fugang Duan's avatar Fugang Duan Committed by Greg Kroah-Hartman
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tty: serial: fsl_lpuart: enable two stop bits for lpuart32 



Add two stop bits support.
User can run the command to enable two stop bits for test:
stty  cstopb  -F /dev/ttyLPx

Signed-off-by: default avatarFugang Duan <fugang.duan@nxp.com>
Signed-off-by: default avatarSherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20210823081733.31941-1-sherry.sun@nxp.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d5c38948

drivers/tty/serial/fsl_lpuart.c

+6 −2
Original line number Diff line number Diff line
@@ -2049,11 +2049,12 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios, 
{

	struct lpuart_port *sport = container_of(port, struct lpuart_port, port);

	unsigned long flags;

	unsigned long ctrl, old_ctrl, modem;

	unsigned long ctrl, old_ctrl, bd, modem;

	unsigned int  baud;

	unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;



	ctrl = old_ctrl = lpuart32_read(&sport->port, UARTCTRL);

	bd = lpuart32_read(&sport->port, UARTBAUD);

	modem = lpuart32_read(&sport->port, UARTMODIR);

	/*

	 * only support CS8 and CS7, and for CS7 must enable PE.
@@ -2097,7 +2098,9 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios, 
	}



	if (termios->c_cflag & CSTOPB)

		termios->c_cflag &= ~CSTOPB;

		bd |= UARTBAUD_SBNS;

	else

		bd &= ~UARTBAUD_SBNS;



	/* parity must be enabled when CS7 to match 8-bits format */

	if ((termios->c_cflag & CSIZE) == CS7)
@@ -2167,6 +2170,7 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios, 
	lpuart32_write(&sport->port, old_ctrl & ~(UARTCTRL_TE | UARTCTRL_RE),

		       UARTCTRL);



	lpuart32_write(&sport->port, bd, UARTBAUD);

	lpuart32_serial_setbrg(sport, baud);

	lpuart32_write(&sport->port, modem, UARTMODIR);

	lpuart32_write(&sport->port, ctrl, UARTCTRL);