tty: serial: make use of UART_LCR_WLEN() + tty_get_char_size()

Having a generic UART_LCR_WLEN() macro and the tty_get_char_size()
helper, we can remove all those repeated switch-cases in drivers.

Cc: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: linux-tegra@vger.kernel.org
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220224095558.30929-2-jslaby@suse.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_omap.c

@@ -357,21 +357,7 @@ static void omap_8250_set_termios(struct uart_port *port,
 	unsigned char cval = 0;
 	unsigned int baud;
 
-	switch (termios->c_cflag & CSIZE) {
-	case CS5:
-		cval = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		cval = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		cval = UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		cval = UART_LCR_WLEN8;
-		break;
-	}
+	cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));
 
 	if (termios->c_cflag & CSTOPB)
 		cval |= UART_LCR_STOP;

drivers/tty/serial/8250/8250_port.c

@@ -2605,21 +2605,7 @@ static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
 {
 	unsigned char cval;
 
-	switch (c_cflag & CSIZE) {
-	case CS5:
-		cval = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		cval = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		cval = UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		cval = UART_LCR_WLEN8;
-		break;
-	}
+	cval = UART_LCR_WLEN(tty_get_char_size(c_cflag));
 
 	if (c_cflag & CSTOPB)
 		cval |= UART_LCR_STOP;

drivers/tty/serial/jsm/jsm_cls.c

@@ -737,21 +737,7 @@ static void cls_param(struct jsm_channel *ch)
 	if (ch->ch_c_cflag & CSTOPB)
 		lcr |= UART_LCR_STOP;
 
-	switch (ch->ch_c_cflag & CSIZE) {
-	case CS5:
-		lcr |= UART_LCR_WLEN5;
-		break;
-	case CS6:
-		lcr |= UART_LCR_WLEN6;
-		break;
-	case CS7:
-		lcr |= UART_LCR_WLEN7;
-		break;
-	case CS8:
-	default:
-		lcr |= UART_LCR_WLEN8;
-		break;
-	}
+	lcr |= UART_LCR_WLEN(tty_get_char_size(ch->ch_c_cflag));
 
 	ier = readb(&ch->ch_cls_uart->ier);
 	uart_lcr = readb(&ch->ch_cls_uart->lcr);

drivers/tty/serial/jsm/jsm_neo.c

@@ -1008,21 +1008,7 @@ static void neo_param(struct jsm_channel *ch)
 	if (ch->ch_c_cflag & CSTOPB)
 		lcr |= UART_LCR_STOP;
 
-	switch (ch->ch_c_cflag & CSIZE) {
-	case CS5:
-		lcr |= UART_LCR_WLEN5;
-		break;
-	case CS6:
-		lcr |= UART_LCR_WLEN6;
-		break;
-	case CS7:
-		lcr |= UART_LCR_WLEN7;
-		break;
-	case CS8:
-	default:
-		lcr |= UART_LCR_WLEN8;
-	break;
-	}
+	lcr |= UART_LCR_WLEN(tty_get_char_size(ch->ch_c_cflag));
 
 	ier = readb(&ch->ch_neo_uart->ier);
 	uart_lcr = readb(&ch->ch_neo_uart->lcr);

drivers/tty/serial/omap-serial.c

@@ -808,21 +808,7 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 	unsigned long flags;
 	unsigned int baud, quot;
 
-	switch (termios->c_cflag & CSIZE) {
-	case CS5:
-		cval = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		cval = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		cval = UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		cval = UART_LCR_WLEN8;
-		break;
-	}
+	cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));
 
 	if (termios->c_cflag & CSTOPB)
 		cval |= UART_LCR_STOP;

drivers/tty/serial/pxa.c

@@ -430,21 +430,7 @@ serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
 	unsigned int baud, quot;
 	unsigned int dll;
 
-	switch (termios->c_cflag & CSIZE) {
-	case CS5:
-		cval = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		cval = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		cval = UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		cval = UART_LCR_WLEN8;
-		break;
-	}
+	cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));
 
 	if (termios->c_cflag & CSTOPB)
 		cval |= UART_LCR_STOP;

drivers/tty/serial/serial-tegra.c

@@ -1277,6 +1277,7 @@ static void tegra_uart_set_termios(struct uart_port *u,
 	unsigned int baud;
 	unsigned long flags;
 	unsigned int lcr;
+	unsigned char char_bits;
 	int symb_bit = 1;
 	struct clk *parent_clk = clk_get_parent(tup->uart_clk);
 	unsigned long parent_clk_rate = clk_get_rate(parent_clk);
@@ -1316,25 +1317,10 @@ static void tegra_uart_set_termios(struct uart_port *u,
 		}
 	}
 
+	char_bits = tty_get_char_size(termios->c_cflag);
+	symb_bit += char_bits;
 	lcr &= ~UART_LCR_WLEN8;
-	switch (termios->c_cflag & CSIZE) {
-	case CS5:
-		lcr |= UART_LCR_WLEN5;
-		symb_bit += 5;
-		break;
-	case CS6:
-		lcr |= UART_LCR_WLEN6;
-		symb_bit += 6;
-		break;
-	case CS7:
-		lcr |= UART_LCR_WLEN7;
-		symb_bit += 7;
-		break;
-	default:
-		lcr |= UART_LCR_WLEN8;
-		symb_bit += 8;
-		break;
-	}
+	lcr |= UART_LCR_WLEN(char_bits);
 
 	/* Stop bits */
 	if (termios->c_cflag & CSTOPB) {

drivers/tty/serial/vr41xx_siu.c

@@ -504,20 +504,7 @@ static void siu_set_termios(struct uart_port *port, struct ktermios *new,
 	unsigned long flags;
 
 	c_cflag = new->c_cflag;
-	switch (c_cflag & CSIZE) {
-	case CS5:
-		lcr = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		lcr = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		lcr = UART_LCR_WLEN7;
-		break;
-	default:
-		lcr = UART_LCR_WLEN8;
-		break;
-	}
+	lcr = UART_LCR_WLEN(tty_get_char_size(c_cflag));
 
 	if (c_cflag & CSTOPB)
 		lcr |= UART_LCR_STOP;