[SERIAL] Introduce per-port capabilities.

This allows us to maintain quirks or capabilities on a per-port basis,
so we can handle buggy clones more effectively.

drivers/serial/8250.c

@@ -122,6 +122,7 @@ struct uart_8250_port {
 	struct uart_port	port;
 	struct timer_list	timer;		/* "no irq" timer */
 	struct list_head	list;		/* ports on this IRQ */
+	unsigned int		capabilities;	/* port capabilities */
 	unsigned short		rev;
 	unsigned char		acr;
 	unsigned char		ier;
@@ -683,6 +684,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 	serial_outp(up, UART_LCR, save_lcr);
 
 	up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
+	up->capabilities = uart_config[up->port.type].flags;
 
 	if (up->port.type == PORT_UNKNOWN)
 		goto out;
@@ -1190,6 +1192,8 @@ static int serial8250_startup(struct uart_port *port)
 	unsigned long flags;
 	int retval;
 
+	up->capabilities = uart_config[up->port.type].flags;
+
 	if (up->port.type == PORT_16C950) {
 		/* Wake up and initialize UART */
 		up->acr = 0;
@@ -1215,7 +1219,7 @@ static int serial8250_startup(struct uart_port *port)
 	 * Clear the FIFO buffers and disable them.
 	 * (they will be reeanbled in set_termios())
 	 */
-	if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
+	if (up->capabilities & UART_CLEAR_FIFO) {
 		serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
 		serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
 				UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
@@ -1428,7 +1432,7 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 	    up->rev == 0x5201)
 		quot ++;
 
-	if (uart_config[up->port.type].flags & UART_USE_FIFO) {
+	if (up->capabilities & UART_USE_FIFO) {
 		if (baud < 2400)
 			fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
 #ifdef CONFIG_SERIAL_8250_RSA
@@ -1489,13 +1493,13 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 
 	serial_out(up, UART_IER, up->ier);
 
-	if (uart_config[up->port.type].flags & UART_STARTECH) {
+	if (up->capabilities & UART_STARTECH) {
 		serial_outp(up, UART_LCR, 0xBF);
 		serial_outp(up, UART_EFR,
 			    termios->c_cflag & CRTSCTS ? UART_EFR_CTS :0);
 	}
 
-	if (uart_config[up->port.type].flags & UART_NATSEMI) {
+	if (up->capabilities & UART_NATSEMI) {
 		/* Switch to bank 2 not bank 1, to avoid resetting EXCR2 */
 		serial_outp(up, UART_LCR, 0xe0);
 	} else {
@@ -1524,7 +1528,7 @@ serial8250_pm(struct uart_port *port, unsigned int state,
 	struct uart_8250_port *up = (struct uart_8250_port *)port;
 	if (state) {
 		/* sleep */
-		if (uart_config[up->port.type].flags & UART_STARTECH) {
+		if (up->capabilities & UART_STARTECH) {
 			/* Arrange to enter sleep mode */
 			serial_outp(up, UART_LCR, 0xBF);
 			serial_outp(up, UART_EFR, UART_EFR_ECB);
@@ -1543,7 +1547,7 @@ serial8250_pm(struct uart_port *port, unsigned int state,
 			up->pm(port, state, oldstate);
 	} else {
 		/* wake */
-		if (uart_config[up->port.type].flags & UART_STARTECH) {
+		if (up->capabilities & UART_STARTECH) {
 			/* Wake up UART */
 			serial_outp(up, UART_LCR, 0xBF);
 			serial_outp(up, UART_EFR, UART_EFR_ECB);