Commit fd29e1e4 authored by Luke Wang's avatar Luke Wang Committed by Greg Kroah-Hartman
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tty: serial: fsl_lpuart: add 7-bits format support on imx7ulp/imx8ulp/imx8qxp 



imx7ulp/imx8ulp/imx8qxp lpuart IP support 7-bits format and have no
limitation on parity when CS7. Remove this limitation and add 7-bits
format support on imx7ulp/imx8ulp/imx8qxp.

Signed-off-by: default avatarLuke Wang <ziniu.wang_1@nxp.com>
Link: https://lore.kernel.org/r/20241008094418.439706-1-ziniu.wang_1@nxp.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 068d35a7

drivers/tty/serial/fsl_lpuart.c

+16 −5
Original line number Diff line number Diff line
@@ -184,6 +184,7 @@ 
#define UARTCTRL_SBK		0x00010000

#define UARTCTRL_MA1IE		0x00008000

#define UARTCTRL_MA2IE		0x00004000

#define UARTCTRL_M7		0x00000800

#define UARTCTRL_IDLECFG	GENMASK(10, 8)

#define UARTCTRL_LOOPS		0x00000080

#define UARTCTRL_DOZEEN		0x00000040
@@ -2222,8 +2223,9 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios, 
	modem = lpuart32_read(&sport->port, UARTMODIR);

	sport->is_cs7 = false;

	/*

	 * only support CS8 and CS7, and for CS7 must enable PE.

	 * only support CS8 and CS7

	 * supported mode:

	 *  - (7,n,1) (imx only)

	 *  - (7,e/o,1)

	 *  - (8,n,1)

	 *  - (8,m/s,1)
@@ -2238,7 +2240,7 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios, 


	if ((termios->c_cflag & CSIZE) == CS8 ||

		(termios->c_cflag & CSIZE) == CS7)

		ctrl = old_ctrl & ~UARTCTRL_M;

		ctrl = old_ctrl & ~(UARTCTRL_M | UARTCTRL_M7);



	if (termios->c_cflag & CMSPAR) {

		if ((termios->c_cflag & CSIZE) != CS8) {
@@ -2265,9 +2267,18 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios, 
	else

		bd &= ~UARTBAUD_SBNS;



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

	if ((termios->c_cflag & CSIZE) == CS7)

	/*

	 * imx support 7-bits format, no limitation on parity when CS7

	 * for layerscape, parity must be enabled when CS7 to match 8-bits format

	 */

	if ((termios->c_cflag & CSIZE) == CS7 && !(termios->c_cflag & PARENB)) {

		if (is_imx7ulp_lpuart(sport) ||

		    is_imx8ulp_lpuart(sport) ||

		    is_imx8qxp_lpuart(sport))

			ctrl |= UARTCTRL_M7;

		else

			termios->c_cflag |= PARENB;

	}



	if ((termios->c_cflag & PARENB)) {

		if (termios->c_cflag & CMSPAR) {